Chemistry

Molecular Weight Calculator (Molar Mass)

Enter a chemical formula and get its molecular weight (molar mass), computed automatically from the atomic weight of every element it contains. Handles simple formulas like H2O, formulas with parentheses like Fe2(SO4)3,...

Chemical Equation Balancer (Coefficient Calculator)

Enter an unbalanced chemical equation like H2 + O2 -> H2O and instantly get the smallest positive integer coefficients that satisfy conservation of mass.

Redox Half-Reaction Balancer (Ion-Electron Method)

Enter an unbalanced redox half-reaction like MnO4- -> Mn2+ and this tool automatically balances it using the ion-electron (half-reaction) method, adding H+, H2O, OH-, and electrons (e-) as needed. Supports both acidic an...

pH Calculator (Free – Acid/Base Test)

Free online tool: enter the hydrogen ion concentration [H+] or a pH value to calculate pH, pOH, [H+], [OH-], and determine whether a solution is acidic, neutral, or basic.

Molarity & Dilution Calculator (C1V1=C2V2)

Use the dilution formula C1V1 = C2V2 to calculate any one of the four values (concentration or volume, before and after dilution) from the other three.

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

Calculate boiling point elevation and freezing point depression from a solute's molality and van't Hoff factor using Raoult's law. Supports six solvent constants (Kb/Kf) including water and benzene, and accounts for elec...

Ideal Gas Law Calculator (PV=nRT)

Using the ideal gas law PV=nRT, enter 3 of pressure, volume, amount of substance (moles), and temperature to calculate the remaining value.

Partial Pressure Calculator (Dalton's Law)

Calculate the partial pressure of each gas in a mixture from the total pressure and each component's mole fraction (or moles), using Dalton's Law of Partial Pressures: P_i = x_i × P_total.

Water Vapor Pressure Calculator (Antoine Equation)

Enter a temperature (°C or °F) to calculate the vapor pressure of water in mmHg, kPa, atm, and bar using the widely used Antoine equation. Change the ambient pressure to see how altitude lowers the boiling point.

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

Look up every element from hydrogen to oganesson: search or browse the periodic table for atomic number, atomic mass, category, electron configuration, and melting/boiling points.

Radioactive Isotope Half-Life Calculator

Using the half-life formula N=N0×(1/2)^(t/T), calculate any one of remaining amount, initial amount, elapsed time, or half-life from the other three.