Enter your monthly take-home pay. Get your needs, wants, and savings targets in one click — or set your own split.
The rule's power is its bluntness: three buckets you can check against your bank statement in a minute. Needs are things with real consequences if unpaid — rent or mortgage, utilities, groceries, commuting, insurance, minimum debt payments. Wants are everything you'd genuinely miss but could live without. Savings covers your emergency fund, investments, and any debt repayment beyond the minimums.
The most common mistake is classifying wants as needs — the premium phone plan, the car that's more than transport, the grocery basket that's half treats. Be ruthless in the sorting; the buckets only mean something if the sorting is honest.
50/30/20 tells you roughly where your money should go. It can't tell you that the wants bucket disappeared by the 14th, or that three forgotten subscriptions are quietly eating your savings share (run the subscription cost calculator if you suspect that one). When you're ready for the precise version, that's zero-based budgeting — every unit of income assigned a job before the month begins. Try the zero-based budget calculator to build your first plan in five minutes.
Multiply your income by each share: needs = income × 50%, wants = income × 30%, savings = income × 20%. The shares are editable and must add up to 100. Use your take-home pay, the amount that actually reaches your account after tax, not your gross salary.
| Take-home pay | Needs (50%) | Wants (30%) | Savings (20%) |
|---|---|---|---|
| $3,000 a month | $1,500 | $900 | $600 |
$600 a month is $7,200 a year, or $36,000 over five years before any interest. If the calculator shows a five-year figure that looks large, that is the point: a small monthly habit is a big number once time is added.
A simple budgeting guideline popularised by Senator Elizabeth Warren: put 50% of your after-tax income toward needs (housing, groceries, utilities, transport, minimum debt payments), 30% toward wants (dining out, streaming, hobbies, travel), and 20% toward savings and extra debt repayment.
Net (after-tax, take-home) income. Use what actually lands in your bank account each month, including any regular side income.
Very common, especially in high-rent cities. The rule is a compass, not a law: if needs run 60–65%, shrink the wants share first and protect at least some savings rate. The custom-split option in this calculator lets you model your real ratio — and a full zero-based budget gives you line-item control the rule can’t.
They solve different problems. 50/30/20 is a 30-second sanity check that needs no tracking. Zero-based budgeting assigns every unit of income a specific job before the month starts, which is far more precise and is what actually changes behaviour. Many people start with 50/30/20 and graduate to zero-based once they want real control.
Net income, meaning your take-home pay after tax and payroll deductions. The buckets are meant to be checked against the money that actually lands in your account.
Change the percentages to reflect reality, for example 60/20/20, and look for the biggest need to reduce over time. The rule is a starting point, not a pass or fail test. A zero-based budget will show exactly where the money goes.
It was popularised by Elizabeth Warren and Amelia Warren Tyagi in their 2005 book All Your Worth. It is a rule of thumb rather than a law, and the exact split matters less than checking your spending against a plan.