Budget Calculator (50/30/20 Rule)

Enter your monthly income and expenses to compare your actual spending against the 50/30/20 rule (50% needs, 30% wants, 20% savings) with a free visual pie chart breakdown.

What is the 50/30/20 budget rule?

The 50/30/20 rule is a simple budgeting guideline that splits your take-home income into three buckets: Needs (50%), Wants (30%), and Savings (20%). It was popularized by then-Harvard law professor (and later U.S. Senator) Elizabeth Warren in a personal finance book she co-authored.

This calculator lets you enter your monthly income and a list of expense items (Needs like housing, groceries and transportation; Wants like dining out, entertainment and shopping). It visualizes your actual spending split as a pie chart and compares it, in both dollar amounts and percentages, against the 50/30/20 targets. You can freely add or edit expense rows, and everything you enter stays in your browser only.

How to use this calculator

Enter your monthly take-home income Use the amount left after taxes and payroll deductions
Add or edit your expense items Pick a preset category or type a custom name, then enter the amount
Check the Needs/Wants classification Presets are classified automatically, but you can switch the type manually for any row
Compare your actual split to the target Use the pie chart and table to see how far you are from the 50/30/20 targets

Tips for getting more out of it

If you live in an expensive city or support a larger household, your Needs share can easily exceed 50%. Treating this as a personalized target rather than a strict rule tends to work better than forcing the exact percentages.
Extra debt payments beyond the required minimum are better classified as Savings rather than Needs, since they represent building future financial security rather than a required monthly obligation.
Small subscription charges add up quickly and can push your Wants share higher than expected — it is worth reviewing your active subscriptions periodically.
Since your entries are stored only in your browser, you will need to re-enter your numbers if you switch to a different device.

When to use this calculator

Spot overspending at a glance

Quickly see which category is over its target share, so you know what to cut back on first

Check whether you are hitting your savings goal

Make it a monthly habit to confirm your savings reach at least 20% of income

Simulate a budget before a job change or move

Test how a new income or housing cost would change your overall budget split before committing

Glossary

Needs: Expenses required to maintain your basic living standard, such as housing, groceries, utilities, insurance, and minimum debt payments.
Wants: Spending that improves your quality of life but is not strictly necessary, such as dining out, entertainment, hobbies, and subscriptions.
Savings: Money set aside for the future, including an emergency fund, investments, and extra debt payoff beyond the minimum. The 50/30/20 rule targets 20% of income.
50/30/20 rule: A budgeting guideline that splits take-home income into 50% Needs, 30% Wants, and 20% Savings, popularized by Elizabeth Warren.

Frequently asked questions

Not necessarily. In high-cost cities, housing (a Need) can easily exceed 50% of income on its own, and the ideal split also depends on household size and income level. Treat it as a starting point, not a strict rule.

That means your total expenses exceed your income. Start by looking for cuts in your Wants spending, and if that is not enough, review your Needs spending as well (for example, housing costs).

It is usually more realistic to include only income you receive reliably every month. Treat irregular income like bonuses as a separate pool for savings or large purchases, rather than folding it into your regular budget.

No. Everything you enter is stored only in your browser's local storage and is automatically restored the next time you visit.

Side Note — The economist behind the 50/30/20 rule

The 50/30/20 rule was popularized by the 2005 book "All Your Worth: The Ultimate Lifetime Money Plan," co-authored by Elizabeth Warren. At the time, Warren was a Harvard Law School professor studying bankruptcy, and her research into why so many American families were filing for bankruptcy led her to look for a simple, memorable way to describe a sustainable income split.

Warren went on to become a U.S. Senator in 2013 and helped establish the Consumer Financial Protection Bureau (CFPB), becoming one of the most prominent voices in consumer finance policy. It is a notable twist of history that a budgeting rule she devised as an academic ended up being practiced by households around the world long before her political career began.

What makes the 50/30/20 rule distinctive compared to older single-number rules of thumb (like "keep rent under a third of your take-home pay") is that it covers your entire budget at once — Needs beyond just housing, Wants, and Savings — rather than focusing on a single expense category in isolation.

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