The 50-30-20 budget calculator
Enter your monthly take-home pay and the rule splits it into three targets: 50% needs, 30% wants, and 20% savings and extra debt payoff. Add what you currently spend to see which line is out of place.
Your 50-30-20 split
Targets from the rule, next to what you actually spend now.
The rule in one paragraph
The 50-30-20 rule splits after-tax income three ways: 50% to needs — the obligations that continue whether or not the month is fun; 30% to wants — everything optional that makes the month enjoyable; and 20% to savings and debt payoff beyond minimum payments. It was popularized by Elizabeth Warren and Amelia Warren Tyagi in All Your Worth (2005) as a deliberately simple alternative to line-item budgeting: instead of tracking forty categories, you watch three ratios and fix whichever one drifts.
On $5,200 of take-home pay, the targets are $2,600 for needs, $1,560 for wants, and $1,040 for savings and extra debt payoff. If actual needs are $2,750 (53%), the plan is not broken — it is $150 of fixed cost away from the template, and the honest options are trimming wants slightly, growing income, or attacking a fixed cost when a lease or loan next renews.
Sorting needs from wants
The honest sort is where the rule succeeds or fails. Needs: rent or mortgage, utilities, groceries, basic transport, insurance premiums, childcare required to work, and minimum debt payments. Wants: eating out, travel, streaming and subscriptions, gym upgrades, and the premium version of anything already covered. The grey areas resolve with one question — if income stopped for three months, would I still have to pay this? Groceries yes; the tasting menu no. A car payment is a need; the upgrade to the larger model was a want wearing a need’s clothing.
When the split does not fit
In expensive housing markets, needs at 60–70% are common and no amount of skipped coffee closes that gap — the levers that matter are housing and transport, and they only move at renewal, refinance, or replacement time. On a low income, even a frugal needs list can exceed 50%, which makes the 20% savings line unrealistic until income grows; a sustainable 10% floor beats an aspirational 20% abandoned by March. If you are not sure what your take-home pay actually is once taxes and payroll deductions come out, the paycheck calculator estimates it from your gross pay, pay frequency, and deductions. And when high-APR debt exists, the 20% bucket usually goes entirely to extra principal until the balance clears — see the debt payoff calculator for what that buys. Where the savings rate does lead is retirement: the same monthly surplus that the rule protects is the contribution the Coast FIRE calculator compounds.
Automate the 20% on payday, before the month starts negotiating. A transfer you never see beats a target you re-litigate at month-end.
Frequently asked questions
Where does the 50-30-20 rule come from?
It was popularized by Elizabeth Warren and Amelia Warren Tyagi in the 2005 book All Your Worth. The percentages apply to after-tax income: 50% to needs, 30% to wants, and 20% to savings and debt payoff beyond minimums.
What counts as a need, and what counts as a want?
Needs are the bills that continue if income stops being fun: housing, utilities, groceries, basic transport, insurance, and minimum debt payments. Wants are everything that upgrades or entertains: eating out, travel, subscriptions, and the nicer version of anything. Groceries are a need; the tasting menu is a want.
Is debt payoff part of the 20%?
Minimum payments are a need — they are not optional. Anything you pay above the minimums counts toward the 20% bucket, alongside saving and investing. When high-APR debt exists, most plans send the whole 20% there first.
My needs are way over 50%. Is the rule useless?
No — treat the targets as direction, not a verdict. In high-cost cities needs often run 60–70% at first. Shrink wants modestly, hold savings at a floor you can sustain — even 10% — and attack the two big fixed costs, housing and transport, when leases and loans come up for renewal.
Should I use gross pay or take-home pay?
Take-home. The rule is built on after-tax income, because taxes are not a need you can negotiate monthly. Use the amount that actually lands in your account in a typical month; for variable income, average the last six months and budget off the low end.