Toolbase

Generator

Password Generator

Password Strength Checker

Memorable Passphrase Generator (Diceware-style)

TOTP (One-Time Password) Generator

Hash

MD5 Hash Converter — Free Online MD5 Calculator

SHA-1 Hash Generator

SHA-256 Hash Generator — Free Online Tool

SHA-512 Hash Generator

SHA-3 (Keccak) Hash Generator (Free)

Argon2 Hash Calculator | Argon2id, Argon2i & Argon2d

Argon2 Hash Verification | Compare a Password Against an Encoded Hash

Compute All Hashes at Once — MD5, SHA-1, SHA-256, SHA-512, SHA-3, BCrypt, Argon2id

File Hash Calculator — Verify Downloads with MD5, SHA-1, SHA-256, SHA-512

Hash Identifier Tool (Reverse Lookup) | Auto-detect MD5, SHA-1, SHA-256, SHA-512, SHA-3, BCrypt, Argon2

Bcrypt Verification

BCrypt Calculation

BCrypt Hash Checker | Verify Password Matches Hash Instantly

Classical Ciphers

Caesar Cipher & ROT13 Generator

Enigma Machine Simulator (Rotor Cipher)

Vigenère Cipher Encoder/Decoder (Keyword Cipher)

Generator

UUID Generator — Bulk v4 Generation, No-Hyphens & Uppercase Formats

Nano ID Generator

ULID Generator

UUID v7 Generator

UUID v7 Timestamp Decoder

Formatter

JSON Formatter

SQL Formatter

URL Parser

JSON Lines (JSONL) ⇔ JSON Array Converter

JSON to TypeScript Type Converter

JSON to Go Struct Converter

XML Formatter

YAML Formatter

TOML Formatter

YAML to JSON Converter

Go Struct to JSON Sample Generator

JSON Diff Checker

XML to JSON Converter

JSON to XML Converter

CSV

CSV Viewer | Open and View CSV Files as a Table (Free, No Upload)

Convert JSON to CSV

CSV to JSON Converter

CSV to SQL Converter (INSERT Statement Generator)

CSV to Markdown Table Converter

Markdown Table to CSV Converter

CSV to HTML Table Converter

HTML Table to CSV Converter

CSV to XML Converter

CSV to Excel Converter

Excel to CSV Converter

CSV Diff Checker

XML to CSV Converter

CSV ⇔ JSON Lines (JSONL) Converter

Encoding

Base64 Encode / Decode — Free, No Sign-up

ASCII Code Table (Free) — Character to Code Converter

Auto Line Break Tool — Wrap Text at a Set Length (Free)

HTML Escape / Unescape

Mojibake Converter & Fixer — Character Encoding Repair Tool

Remove Line Breaks Tool

Twitter (X) Character Counter - Full-width 2-count Rule

Extension ↔ MIME Type Converter

Unicode / Character Code Cross-Reference

File to Base64 Converter (with data URI support, both directions)

Server Config

.htpasswd File Generator

CSP Header Validator

Security Headers Checker

SSL Certificate Decoder (X.509)

CSR Decoder (Certificate Signing Request)

.htaccess Syntax Checker

Testing & Demo

Braintree, Stripe, PayPal & Square Test Card Numbers (2026 List)

Credit Card Number Validator | Luhn Algorithm & Brand Detection

Dummy File Generator

Sample CSV (Dummy Data) Generator

Text Processing

Regex Tester

Text Diff Comparison

List Compare Tool (Common & Unique Lines)

URL Slug Generator

Scheduler

Cron Expression Parser & Next Run Calculator

Cron Expression Builder

Cron Expression to systemd Timer Converter

systemd Timer to Cron Expression Converter

SEO Validators

robots.txt Validator

Sitemap.xml Validator

OGP & Meta Tag Validator

JSON-LD Structured Data Validator

ads.txt Validator

Hreflang Tag Validator

Web App Manifest (manifest.json) Validator

Robots Meta Tag / X-Robots-Tag Validator

security.txt Validator

JWT

JWT Decoder

JWT Encoder (Generate & Sign)

JWT Signature Verifier (RS256/ES256, Public Key Verification)

Binary & Numbers

Free Data Size Converter (Bytes, KB, MB, GB, TB)

Number Base Converter (Binary, Octal, Decimal, Hexadecimal)

Bitwise Operation Simulator (AND, OR, XOR, NOT, Shift)

Byte Length Counter by Encoding

Binary Hex Editor | View and Edit Files in Hexadecimal

Unix Timestamp Converter

Two's Complement Calculator (Signed Integer Binary Converter)

IEEE 754 Converter — Float to Binary Bits (32/64-bit)

ISO 8601 Duration Converter

FP16 & bfloat16 Bit Pattern Visualizer

Text Analysis

Word Counter (Characters, Words and Reading Time)

Free Japanese Word Counter | Accurate Even Without Spaces

Case Converter — kebab-case, camelCase, snake_case (Free)

Number ↔ Kanji Numeral Converter

Jōyō Kanji List — Elementary School Readings & Stroke Counts (Grades 1–2)

Fun

Free Emoji List & Search — Copy and Paste in One Click

"Ojisan" Text Style Generator (Japanese "Uncle-Speak")

"Gyaru-go" Text Style Generator (Japanese Gal Slang)

Okinawan Dialect ("Uchinaguchi") Generator

Old English Translator (Shakespearean Style)

Fancy Text Generator (Unicode Stylish Fonts)

Image to ASCII Art Converter

Zalgo Text Generator (Glitchy, Corrupted Text)

Invisible Text Generator (Blank Text for Copy & Paste)

Upside Down Text Generator

Morse Code Encoder (Text to Morse Code)

Morse Code Decoder (Morse Code to Text) with Chart

Flag Semaphore Encoder (Text to Signal Diagrams)

Flag Semaphore Decoder (Positions to Text)

Japanese Business Honorifics Chart ("Kisha" / 貴社) by Organization Type

Phonetic Alphabet Chart & Converter (NATO Alphabet) | Alpha, Bravo, Charlie

Generators

QR Code Generator (Free, Online)

Chinese Calligraphy Font Generator (Brush & Cursive Script)

Markdown Preview

Basic Calculations

Calculator (Free, No Sign-up) — Type Full Formulas with Parentheses

Consumption Tax Calculator

Discount Calculator — % Off, Markdown & Half-Price in One Click

BMI Calculator

Compound Interest Calculator with Monthly Deposits

Million/Billion/Trillion Converter — 万/億/兆 (Free)

Big Number Calculator — Exact Arithmetic with Unlimited Digits (BigInt)

Scientific Calculator (sin, cos, tan, log, power, factorial)

Fraction Calculator (Common Denominator, Simplify, Add, Subtract, Multiply, Divide)

Factorial Calculator (n!, Permutations nPr, Combinations nCr)

Statistics Calculator (Mean, Median, Variance, Standard Deviation, Quartiles)

Z Score Calculator (Percentile & T-Score)

GPA Calculator (Grade Point Average)

Scale Calculator (Convert Between Actual Size and Drawing Length)

Function Graphs

Linear Function Grapher y = ax + b (Free Online Tool)

Quadratic Function Grapher & Calculator — Vertex and Roots

Cubic Function Grapher & Calculator — Inflection and Extrema

Exponential Function Graph (y = a·bˣ + c)

Logarithm Graph Maker — Free Online (y = a·log_b(x) + c)

Ellipse Graph (x²/a² + y²/b² = 1)

Hyperbola Graph (x²/a² − y²/b² = 1)

Chart Maker

Free Pie Chart Maker — Online Tool

Sequences

Arithmetic Sequence Calculator (aₙ = a₁ + (n−1)d)

Geometric Sequence Calculator (aₙ = a₁·rⁿ⁻¹)

Fibonacci Sequence Calculator — Instant Nth Term & Golden Ratio Chart

Figurate Numbers Calculator (Triangular, Square, Pentagonal, Hexagonal)

Number Theory

Prime Number Checker – Up to 1,000 Digits, Free

Sieve of Eratosthenes Generator (Free) – List Primes & Find the Nth Prime

Prime Factorization Calculator & Tool — Free Online Site (up to 1,000,000)

GCD & LCM Calculator

Modular Arithmetic Calculator (Mod Calculator)

Chinese Remainder Theorem (CRT) Calculator — Solve Simultaneous Congruences

Euler's Totient Function (φ) Calculator — Coprime Counter

Geometry

Triangle Calculator | Solve Sides, Angles & Area Instantly (SSS/SAS/ASA)

Area Calculator

Bearing & Distance Calculator (Latitude/Longitude)

Volume Calculator — Cube, Cylinder, Sphere & More

Vector Calculator (Dot Product, Cross Product, Magnitude, Unit Vector, Angle)

Slope Calculator (Degrees, Percent Grade, Ratio)

Size & Unit Converters

Free Unit Converter (Length, Weight & Temperature)

Free Area Unit Converter (m², Tsubo, Tatami Mats, Acres & More)

Shoe Size Converter — Japan (cm), US, UK, EU

Ring Size Converter — Japan, US, UK, EU

Clothing Size Calculator & Converter (Women's & Men's / Japan, US, UK, EU)

Word Problems

Chickens and Rabbits Problem Calculator (Head & Legs Word Problem)

Probability

Gacha Probability Calculator (Expected Value & Pity Simulator)

Analysis

Fourier Series Visualiser

Fourier Series Coefficient Calculator

Clocks & Timers

Clock

Stopwatch

Timer

Time Difference Calculator | Timezone Converter (Free)

World Clock — Current Time by Second on a Live Map, Free

Pomodoro Timer

Calendar

Japan Holiday Calendar — Is This Date a Holiday? Plus Streak Ranking

Holiday Checker (Is This Day a Holiday?)

Rokuyou Calendar (Auspicious & Inauspicious Days at a Glance)

Japanese Era Converter (Meiji–Reiwa)｜CE ⇔ Wareki Chart & Age Calculator

Japanese Era Names (Gengō) — Full List, Taika to Reiwa

Japanese Era & Zodiac Lookup

Chinese Zodiac (Eto) Lookup

Free Japanese Name Numerology (Seimei Handan)｜Five Grids by Kanji Stroke Count

What Time Is the Hour of the Rabbit or the Ox? Edo-Era Zodiac Hour Converter

Japanese Seasonal Letter Greetings by Month

Age & Life

Japan Age Calculator with Japanese Era (Wareki)

Yakudoshi & Happosagari Checker

Japan School Age Calculator (Elementary, Middle, High School, Retirement by Birth Year)

Japanese School Timeline Calculator (Enrollment & Graduation Years)

Japanese Longevity Milestones Calculator

Japanese Buddhist Memorial Service Calculator (Isshuki, Sankaiki, Nanakaiki)

Mochu Hagaki Checker — Japanese Mourning Postcard Eligibility & Timing

Koden-Gaeshi Calculator (Funeral Return Gift Amount)

Buddhist Memorial Service Offering (Ofuse) Calculator

Condolence Money (Koden) Amount Calculator — Giving Side

Wedding Gift Money (Goshugi) Amount Calculator — Giving Side

Childbirth Gift Money Amount Calculator — Giving Side

Life Path Number Calculator (Numerology) | Find Your Life Path Number

Calculators

Date Difference Calculator

Date Calculator (Add or Subtract Days)

Time Calculator: Add & Subtract Hours, Minutes, Seconds

Business Day Calculator

Countdown Timer

What Week Is It? Week Number Calculator | ISO 8601 Calendar (All 52/53 Weeks)

Color

RGB to Hex Color Code Converter (and Hex to RGB) — Free, No Sign-Up

Color Model Converter (RGB, HSL, HSV, CMYK)

Contrast Ratio Checker (WCAG Compliance Check)

Color Blindness Simulator

Color Palette Reference — Copy Standard Web & Material Design Colors

Extract Colors from an Image (Dominant Color Extractor)

RGBA to RGB Converter (Flatten onto a Background)

Icon

Favicon Generator | Multi-Size ICO and PNG in One Click

CSS

CSS Gradient Generator

CSS Box Shadow Generator

CSS Flexbox Generator

CSS Grid Generator

CSS position Property Generator

PX to REM Converter (& REM to PX)

Image

Aspect Ratio Calculator & Converter (Simplify & Resize)

Placeholder Image Generator (Sample Image Maker)

Image Compressor (Free, No Upload — Reduce Image File Size)

Image Format Converter (PNG/JPG/WebP)

HEIC Converter — HEIC to JPG, PNG and WebP (Free, Batch)

AVIF to JPG Converter (also PNG, WebP) — Free, Batch

SVG to PNG Converter (also converts to JPG)

Image Mosaic & Blur — Hide Faces or Plates Before Posting (Free, No Upload)

Meme Generator — Add Captions to Images Free

Speech Bubble Maker (Free — Add Comic-Style Speech Bubbles to Photos)

Image Crop Tool

Combine Images Online — Free Image Joiner

Image Resizer (Resize by Width & Height)

Make Image Transparent (Remove Solid-Color Background)

EXIF Viewer — Check Photo Date, Camera Model & GPS Location

Pixel Art Maker

Documents & Print

Paper Size Chart (Free) — A/B Series, mm & px Converter

Sample PDF Generator (Dummy PDF File Creator)

Hanko Stamp Maker (Free, No Sign-up)

URL & API

URL Encoder/Decoder

REST API Tester

HTTP Status Code List

curl Exit Codes Reference: Look Up Any Return Code (1-99) & Fix

curl Command Generator

IP & Subnet

Subnet Calculator & Quick-Reference Table — Free, /1–/32 CIDR

CIDR / Subnet Mask Reference Table

What Is My IP Address? Free IP Checker

IP WHOIS Lookup

IP Address / Domain Blacklist (DNSBL) Checker

IP Range ⇔ CIDR Converter

IP Address Validator — Check IPv4/IPv6 Format & Detect Private Ranges (Free)

IPv6 CIDR Reference Table — Address Counts by Prefix Length (Free)

Subnet Overlap Checker — Detect Whether Two CIDR Blocks Overlap (Free)

Domain

Domain WHOIS Lookup – Who Owns This Domain? (Free)

Punycode Converter (Internationalized Domain Names)

Domain Name Validator (RFC Compliance Check)

SSL Certificate Checker (Expiry & Issuer Lookup)

TLS Protocol Version Diagnostic Tool

Reference

Kbps to Mbps to Gbps Converter (Free) — Convert Internet & Connection Speed Instantly

Port Number Reference

MAC Address Lookup (Vendor & OUI Finder)

Email

Email Address Validator

SPF/DKIM/DMARC Record Checker

DNS Record Type Reference Guide

DNS Propagation Checker (Free) - Check DNS Records Worldwide

DNSSEC Checker

MTA-STS Policy Checker

DANE/TLSA Record Checker

TLS-RPT (SMTP TLS Reporting) Record Checker

DMARC Aggregate Report Viewer

DKIM DNS Record Generator

Email Header Analyzer

Salary & Tax

Japan Net Salary Calculator: Annual Income to Take-Home Pay

Australia Take-Home Pay Calculator (Income Tax & Medicare Levy)

Income Tax Calculator Ontario (Canada Take-Home Pay)

German Salary Calculator (Brutto Netto Rechner) – Gross to Net Pay

German Tax Class (Steuerklasse) Optimizer for Married Couples

French Salary Calculator (Salaire Brut en Net)

Take-Home Pay Calculator UK

Self-Employed Tax Calculator (UK) — Income Tax & Class 4 NI

UK Dividend Tax Calculator — Director's Salary & Dividends

Paycheck Calculator – US Salary Calculator (Take-Home Pay)

Bonus Tax Calculator (US, Percentage Method)

Self-Employment Tax Calculator (US)

Spain Net Salary Calculator (Salario Bruto a Neto)

Italy Net Salary Calculator (Calcolo Stipendio Netto)

Mexico Net Salary Calculator (Calculadora ISR)

Freelancer Take-Home Pay Simulator (Japan) — Income Bracket Quick Reference

Gross-Up Calculator — Reverse-Calculate Salary from Take-Home Pay

Japan Bonus Take-Home Pay Simulator (Free) | Social Insurance & Withholding Tax

Overtime Pay Calculator - Overtime, Late-Night & Holiday Wage Premiums (Japan)

Paid Leave Days Calculator - Entitlement & Balance from Your Hire Date (Japan)

Furusato Nozei Limit Calculator

Japan Resident Tax (Juminzei) Calculator (Based on Prior-Year Income)

Salary to Hourly Wage Converter | Annual, Monthly & Daily Pay

Japan Income Percentile & Deviation Score Calculator

Maternity Allowance Calculator (Japan Shussan Teatekin)

Sickness and Injury Allowance Calculator (Japan Shobyo Teatekin)

High-Cost Medical Expense Benefit Calculator (Japan Kogaku Ryoyohi)

Medical Expense Deduction Calculator (Japan Iryohi Kojo)

Self-Medication Tax System Calculator (Japan)

Specific Expense Deduction Calculator

Life Insurance Premium Deduction Calculator

Earthquake Insurance Premium Deduction Calculator

Japan Childcare Leave Benefit Calculator

Freelancer Pension & Retirement Fund Comparison (iDeCo vs. National Pension Fund vs. Small Enterprise Mutual Aid)

Japan Employees' Pension (Kosei Nenkin) Estimate Calculator

Japan Long-Term Care Insurance Premium Calculator (Age 65+, Category 1 Insured)

Severance Pay Take-Home Calculator (Retirement Income Deduction & Separate Taxation)

Redundancy Pay Calculator (Statutory Redundancy Pay)

Spain Severance Pay Calculator (Calculadora de Finiquito)

Brazil Vacation Pay Calculator (Cálculo de Férias CLT)

Brazil Severance Pay Calculator (Rescisão Trabalhista CLT)

Mexico Severance Pay Calculator (Calculadora de Finiquito y Liquidación)

German Severance Pay Calculator (Abfindungsrechner)

Japan Unemployment Insurance Calculator (Kihon Teate / Basic Allowance Simulator)

Japan "Income Wall" Calculator (¥1.03M/1.06M/1.30M/1.50M Walls)

Wealth Building & Investing

Home Loan Calculator

Mortgage Refinance Calculator — Break-Even & Total Savings

HELOC Repayment Calculator — Draw Period vs. Repayment Period

Cash-Out Refinance Calculator | Compare Tapping Equity vs. a Separate Loan

Home Equity Loan Calculator | Monthly Payment, Total Interest & Combined Loan-to-Value (CLTV)

HELOC vs. Home Equity Loan Calculator

DTI Calculator (Debt-to-Income Ratio)

Home Affordability Calculator

UK Stamp Duty Calculator (SDLT)

LBTT Calculator (Scotland Land and Buildings Transaction Tax)

Net Worth Calculator

Mortgage Repayment Method Comparison (Equal Installment vs Equal Principal)

Debt Payoff Calculator (Snowball vs. Avalanche)

Auto Loan Calculator

Student Loan Calculator

529 Plan Calculator (College Savings Simulator)

Car Lease Payment Calculator

Auto Loan vs Lease Comparison

Car Depreciation Calculator

Car Affordability Calculator (20/4/10 Rule)

Car Total Cost of Ownership (TCO) Calculator

Rent vs Buy Comparison Simulator

Savings & Investment Calculator — Lump Sum + Monthly, Year by Year

CD Calculator (Certificate of Deposit)

Money Market Account Calculator (CD vs. HYSA vs. MMA)

CD Ladder Calculator

T-Bill Calculator (Treasury Bill Yield)

Savings Bond Calculator (I Bond & Series EE Bond)

New NISA Simulator (Tsumitate & Growth Investment Quotas)

Investment Return Calculator (Free Compound Interest Simulator)

CAGR Calculator (Compound Annual Growth Rate)

XIRR Calculator (Irregular Cash Flow Rate of Return)

Capital Gains Tax Calculator (US Federal)

Learn Technical Indicators (MACD, RSI, Bollinger Bands)

Inflation Calculator

Retirement Savings Calculator

Social Security Calculator (Estimate Your Retirement Benefit)

Social Security Spousal Benefit Calculator

Social Security Survivor Benefit Calculator

Annuity Calculator (Payout, Present Value & Lump Sum Comparison)

Structured Settlement Calculator (Buyout Value & Discount Rate)

Lottery Payout Calculator: Lump Sum vs Annuity (Powerball/Mega Millions)

401k Calculator (Employer Match & Roth vs. Traditional)

IRA Calculator (Traditional vs Roth)

SEP IRA Calculator (Self-Employed Contribution Limit)

Solo 401(k) Calculator (Self-Employed Individual 401k)

Backdoor Roth IRA Calculator (Pro-Rata Rule)

Mega Backdoor Roth Calculator (401(k) After-Tax Contribution Room)

RMD Calculator (Required Minimum Distribution)

Coast FIRE Calculator

Barista FIRE Calculator

Savings Rate & Financial Independence (FI) Calculator

Real Estate Investment Calculator

Japanese Inheritance Tax Simulator | Estimate Tax From Estate Value and Heirs

Lifetime Gift Planner | Simulate Annual Gifting vs. Inheritance Tax (Japan)

Lump-Sum Gift Settlement Simulator | Estimate Combined Gift & Inheritance Tax (Japan)

Life Insurance Inheritance Tax Exemption Calculator | Estimate the Tax Difference

Life Insurance Needs Calculator | Estimate How Much Coverage You Need

Term Life vs Income Protection Insurance Comparison | Compare Premiums for the Same Coverage

Spousal Inheritance Tax Reduction Calculator | First & Second Inheritance Combined

Small-Scale Residential Land Exception Calculator | Reduce Land Value up to 80%

Inheritance Tax Minor & Disability Deduction Simulator | Estimate Deductions and Tax Owed

Consecutive Inheritance Tax Credit Simulator | Reduce Tax When Inheritance Occurs Within 10 Years

Foreign Tax Credit Simulator for Inheritance Tax | Ease Double Taxation on Overseas Assets

Japanese Inheritance Tax 20% Surcharge Simulator | How Much More Do Non-Spouse/Child Heirs Pay?

Japanese Special Contribution Payment Inheritance Tax Simulator | How Much Tax on a Caregiving Claim?

Spousal Residence Right Valuation Simulator | How Much Is the Inheritance Tax Value?

Base Estate Value Calculator for Forced Heirship | Factor In Lifetime Gifts for an Accurate Figure

Forced Heirship Claim Simulator | Did a Will or Gift Leave You Short of Your Reserved Portion?

Forced Heirship Apportionment Calculator | How Multiple Recipients Share the Burden

Special Benefit Advancement Calculator | Simulate Each Heir's Concrete Share

Contribution Share (Kiyo-bun) Calculator | Simulate Your Concrete Inheritance Share

Combined Special Benefit & Contribution Share Calculator | Simulate Concrete Inheritance Shares in an Estate Division

Excess Advancement Reapportionment Calculator | Reallocate an Inheritance Fairly

Living Costs

Electricity Cost Calculator | Estimate Monthly Bill by Appliance

Car Maintenance Cost Calculator | Monthly & Annual Running Costs

Vehicle Tax Calculator (Japan)

Vehicle Tax Proration Calculator (Japan)

German Vehicle Tax (Kfz-Steuer) Calculator

Environmental Performance Tax Calculator (Japan)

Compulsory Automobile Liability Insurance (CALI / Jibaiseki) Calculator

Vehicle Weight Tax Calculator (Japan)

Japan Vehicle Recycling Fee Estimator

Japan Vehicle Inspection (Shaken) Total Cost Calculator

EV vs Gasoline Car Lifetime Cost Comparison

Kei Car vs Regular Car Running Cost Comparison

Japanese Car Insurance Grade Premium Calculator

Japanese Car Insurance Claim vs Self-Pay Break-Even Simulator

Second-Car Discount Eligibility Checker & Grade Simulator

Gold License & Driver Age Condition Premium Impact Comparison

Driver Scope Rider (Named Insured Only / Named Insured & Spouse Only) Premium Impact Comparison

Deductible (Self-Pay Amount) Change Premium Impact Comparison

Telematics Insurance Enrollment Premium Impact Comparison

Sales Channel (Agent vs. Direct) Insurance Premium Impact Comparison

Paperless Policy Discount Insurance Premium Impact Comparison

Usage Purpose (Daily/Commute/Business) Insurance Premium Impact Comparison

Commute Cost Comparison (Car vs Public Transit)

Water Bill Calculator

Gas Bill Calculator

Everyday Calculators

Percentage Calculator — Why a 20% + 10% Discount Isn't 30% Off

Budget Calculator (50/30/20 Rule)

Mercari Fee Calculator (vs Rakuma, Yahoo! Flea Market & Auctions)

Resale Profit Tracker (Multi-Item Reselling Profit Calculator)

VAT Calculator | Add or Remove VAT and Compare Rates by Country

VAT Number Validator - Offline Format & Check Digit Verification

Bill Split & Expense Settlement Calculator

Lottery & Gambling Odds

Lottery Win Simulator | Visualize Expected Value & Payout Ratio with Monte Carlo

Loto 6 vs 7 vs Mini Loto vs Bingo 5 vs Numbers: Which Wins More?

Lottery Winnings Gift Tax Simulator | Tax on Sharing Prize Money With Family

SaaS Metrics

MRR & ARR Growth Simulator

SaaS "Rule of 40" Checker

SaaS Magic Number Calculator

CAC Payback Period Calculator

Burn Multiple Calculator

Net Revenue Retention (NRR) Calculator

Gross Revenue Retention (GRR) Calculator

Logo Churn Rate Calculator

Cohort Retention Table & Chart Generator

SaaS Quick Ratio Calculator

SaaS ARR per Employee Calculator

ARPA (Average Revenue Per Account) Calculator

Sales Metrics

ACV (Annual Contract Value) Calculator

Weighted Pipeline Value Calculator — Forecast Revenue from Deal Size & Win Probability

Sales Velocity Calculator

Creator Economy

YouTube Ad Revenue Calculator (Free) | RPM Earnings Estimator

Affiliate Revenue Calculator

SNS Engagement Rate Calculator

Influencer Sponsored Post Rate Calculator

SNS Follower Growth Rate & Target Date Calculator

Business Metrics

Marketing Metrics Calculator — CTR, CPC, ROAS & LTV

Progress Rate Calculator | Weighted Average of Multiple Tasks

NPS (Net Promoter Score) Calculator | Free Customer Loyalty Metric

eNPS (Employee Net Promoter Score) Calculator | Free Employee Engagement Metric

Turnover Rate Calculator | Free Voluntary vs. Involuntary Breakdown

Cost per Hire Calculator | Free Recruiting Cost Breakdown

Time to Hire Calculator | Free Recruitment Lead Time Calculation

Quality of Hire Score Calculator | Weighted Multi-Metric Free Calculation

Offer Acceptance Rate Calculator | Free Hiring Funnel Yield Tool

Hiring Funnel Conversion Rate Calculator | Free Recruiting Analysis

New Hire Retention Rate (Early Turnover Rate) Calculator | Free Post-Hire Retention Tool

Absenteeism Rate Calculator | Free HR Metric Tool

Paid Leave Utilization Rate Calculator | Free HR Metric Tool

Overtime Hours & Article 36 Agreement Limit Checker | Free 45h/Month & 360h/Year Alert

CSAT (Customer Satisfaction Score) Calculator | Free Survey Aggregator

Customer Effort Score (CES) Calculator | Quantify How Easy Support Was

Gross Margin Calculator (with Cost Ratio) | Free Profitability Tool

Operating Margin Calculator (Revenue, COGS & SG&A)

Ordinary Income Margin Calculator (Operating Profit & Non-Operating Income/Expenses)

Net Profit Margin Calculator (From Ordinary Income, Extraordinary Items & Taxes)

ROE & ROA Calculator (Return on Equity, Return on Assets Formula, DuPont Analysis)

Break-Even Point Calculator (Fixed & Variable Costs)

Depreciation Calculator (Straight-Line & Declining Balance)

Small Asset Depreciation Checker (Japan Tax Rules)

Japan Corporate Tax Calculator (Estimate)

Japan Corporate Tax Interim Payment Calculator

Japanese Consumption Tax Interim Payment Calculator (Chukan Shinkoku)

Consumption Tax Taxable Person Checker (Japan)

Incorporation Consumption Tax Exemption Simulator (Japan)

Voluntary Taxable Person Election Refund Simulator (Japan Consumption Tax)

Taxable Person Revocation Timing Simulator (Japan Consumption Tax)

Japan Invoice Registration Number Validator | T-Number Check Digit Verification

Simplified Consumption Tax Scheme Advantage Judge (Japan)

Simplified Taxation Revocation Timing Simulator (Japan Consumption Tax)

2% Special Provision Tax Calculator (Consumption Tax 2-Wari Tokurei)

Transitional Deduction Calculator for Purchases from Tax-Exempt Businesses (80%/70%/50%/30%) (免税事業者からの仕入れ経過措置計算)

Japan Invoice Small Amount Exception Checker (Under ¥10,000 Purchases)

Invoice Registration Cancellation Deadline Calculator (Japan Qualified Invoice Issuer)

Invoice Registration Application Deadline Calculator (Japan Qualified Invoice Issuer)

Invoice Generator — Create Free Invoices & Estimates

Free Receipt Generator (PDF Download)

Compress

ZIP Creator (Free, Online)

TAR.GZ Creator

Decompress

ZIP Extractor

GZ/TAR.GZ Extractor (Free, Online)

Convert

Free Image to PDF Converter (JPEG, PNG, WEBP)

File Encoding Converter (UTF-8 with BOM, Shift_JIS)

PDF

Compress PDF (Free, No Upload — Reduce PDF File Size)

PDF Organizer — Reorder, Merge & Split Pages (No Upload, In-Browser)

Redact PDF (Free — Black Out Text, No Upload)

PDF to JPG Converter (Free — Convert Each Page to PNG or JPG)

PDF to Text Converter (Free — Extract Text from PDF Online)

PDF Watermark & Page Numbers (Free, No Upload)

Stoichiometry

Molecular Weight Calculator (Molar Mass)

Chemical Equation Balancer (Coefficient Calculator)

Redox Half-Reaction Balancer (Ion-Electron Method)

Solutions

pH Calculator (Free – Acid/Base Test)

Molarity & Dilution Calculator (C1V1=C2V2)

Raoult's Law Calculator (Boiling Point Elevation & Freezing Point Depression)

Gases & Vapor

Ideal Gas Law Calculator (PV=nRT)

Partial Pressure Calculator (Dalton's Law)

Water Vapor Pressure Calculator (Antoine Equation)

Elements & Isotopes

Periodic Table of Elements — Search & Detailed Data for All 118 Elements

Radioactive Isotope Half-Life Calculator

Mechanics

Projectile Motion Simulator

Uniform Acceleration Calculator (Velocity & Displacement)

Work & Energy Calculator (Work, Kinetic Energy & Potential Energy)

Friction Force Calculator (Static, Kinetic & Inclined Plane)

Momentum & Collision Calculator (Elastic, Inelastic, Restitution Formula) - Free

Simple Harmonic Motion Calculator (Spring-Mass & Pendulum)

Uniform Circular Motion Calculator (Centripetal Force, Angular Velocity, Period)

Torque (Moment of Force) Calculator — τ = rFsin(θ)

Electricity

Ohm's Law Calculator (Voltage, Current, Resistance)

Resistor Color Code Calculator (Color to Value & Value to Color)

Series & Parallel Resistor Calculator (Total Resistance)

Ceramic Capacitor Code Converter (Code to Capacitance & Capacitance to Code)

Free LC Resonant Frequency Calculator | Inductor-Capacitor Circuit

Inductor (Coil) Color Code Calculator (Colors → Inductance & Inductance → Colors)

RC Circuit Time Constant Calculator (with Charge/Discharge Graph)

SMD Resistor Code Calculator (3-Digit, 4-Digit & EIA-96)

Data Lookup

Japan Postal Code Search & Reverse Lookup (Code ⇄ Address)

Municipality Search (Japan)

Bank Code & Branch Code Lookup

IBAN Validator (International Bank Account Number Checker)

SWIFT Code Checker (BIC Format Validator)

VIN Decoder (VIN Check & Check Digit Validator)

Barcode Check Digit Validator & Calculator (UPC/EAN/GTIN)

ISBN Check Digit Calculator & ISBN-10/13 Converter

Routing Number Checker (ABA Validator)

Canada SIN Check Digit Validator (Social Insurance Number)

Brazil CPF Check Digit Validator & Calculator

Chile RUT Check Digit Calculator (Rol Único Tributario Validator)

Spanish DNI/NIE Check Letter Calculator (Letra DNI Validator)

Country & Region Code List (ISO Codes, Calling Codes, Currencies)

Phone Number Formatter (E.164 & International Format)

Airport Code Lookup (IATA & ICAO Codes)

Port Code Lookup: UN/LOCODE List for 197 World Ports

Practice

Metronome (Online, Free)

Note Name to Frequency Converter (Concert Pitch Supported)

Chromatic Tuner (Free, Online)

Cents & Transpose Calculator

Circle of Fifths — Click a Key to See Its Signature, Relative Key, and Chords

Guitar Capo Chart & Position Calculator

BPM to ms Converter | Delay Time Calculator

BPM Finder (Tap Tempo)

Chord Progression Generator ― Pick a Key and Play Popular Progressions

Chord Finder — Identify Chord Names from Notes (Piano Keyboard)

Device Tests

Webcam Test (Free, Online)

ID Photo Maker with Your Webcam | Passport & Visa Sizes

Microphone Test (Free, Online)

Speaker & Headphone Test (Free, Online)

Dead Pixel Test (ドット抜けチェック) — Free Fullscreen Screen Check

Keyboard Tester | Check Every Key, Ghosting & N-Key Rollover (NKRO)

Click Speed Test (CPS Test)

Reaction Time Test — Measure Your Reflexes in Milliseconds

Color Blind Test — Free Online Color Vision Check

Hearing Test Online — Check Your High-Frequency Hearing Range

Screen Recorder (Free, In-Browser)

Checkups & Reference Values

Health Checkup Reference Guide

Calculators

BMR Calculator (Basal Metabolic Rate)

TDEE Calculator (Free) — Get Your Total Daily Energy Expenditure & Target Calories Instantly

Calories Burned Calculator (Free) — Estimate Energy Burned Per Workout

Macro Calculator (Protein, Fat, Carb Split)

Body Fat Calculator (Tape Measure Only, No Scale Needed)

Lean Body Mass (LBM) Calculator

Kaup Index & Rohrer Index Calculator (Child Growth Check)

Alcohol Elimination Time Calculator (Free) - How Long Until It Leaves Your System & BAC

One Rep Max Calculator (1RM Calculator)

Pace Calculator (Distance, Time & Pace Converter)

Pregnancy Due Date & Ovulation Calculator

Period Calculator (Next Period, Ovulation & PMS Predictor)

BBT Chart (Basal Body Temperature) — Ovulation Estimator

Ovulation Test (OPK) Tracker

Sleep Calculator (90-Minute Cycle Bedtime & Wake-Up Time)

Standards Comparison

LAN Cable Standards (Cat5e to Cat8 Comparison)

Wi-Fi Standards (802.11a to Wi-Fi 7 Comparison)

USB Standards and Connector Types | Type-A vs B vs C, USB 1.1 to USB4

US vs JIS Keyboard Layout Comparison (Symbol Key Positions)

Travel & Transport

How Many Minutes to Walk 1 km? Distance to Time

Fuel Cost Calculator | Distance, MPG & Price, Round Trip + Per-Km Cost

Science & Nature

Layers of the Atmosphere (Interactive Diagram)

Pets

Dog Age Calculator (Dog & Cat Years to Human Years, by Breed Size)

Dog & Cat Body Condition Score Checker (BCS Rating & Ideal Weight Estimate)

Dog & Cat Daily Feeding Amount & Calorie Calculator (by Weight & Life Stage)

Home & DIY

Concrete Calculator (Slab, Footing & Stairs Volume + Bags Needed)

Gravel Calculator (Volume & Weight Estimate)

Mulch Calculator (Bags Needed)

Cooking

Cups to Grams Converter (Cups, Tablespoons & Teaspoons to Weight)

Air Fryer Conversion Calculator (Oven to Air Fryer Temperature & Time)

Recipe Converter (Recipe Scaling Calculator)

Environment & Sustainability

Carbon Footprint Calculator | Estimate Your Personal CO2 Emissions from Car, Electricity, Gas & Diet