Budget Calculator (50/30/20 Rule)
Plan your monthly money with the popular 50/30/20 rule — 50% to needs, 30% to wants, 20% to savings and debt payoff. Adjust the percentages to fit your life, then enter what you actually spend to see how close you are.
Your income
Target percentages
Total: 100%
What you actually spend or save (optional)
Needs
Essentials you can’t skip: housing, utilities, groceries, transportation, insurance, minimum debt payments.
Wants
Lifestyle spending: dining out, streaming, hobbies, gym, travel, gadgets.
Savings & debt payoff
Money that builds your future: retirement, emergency fund, investments, and extra debt principal.
Total allocated
$0
Unallocated income
$5,000
How the 50/30/20 budget rule works
Popularized by U.S. Senator Elizabeth Warren in her book All Your Worth, the 50/30/20 rule is a simple way to split your take-home pay into three buckets so essentials, lifestyle, and future-you all get funded every month.
- 50% to needs — bills you’d still owe if your income vanished tomorrow: rent or mortgage, utilities, groceries, transportation, insurance premiums, and minimum payments on any debt.
- 30% to wants — discretionary lifestyle spending: dining out, streaming subscriptions, hobbies, vacations, new clothes, gym memberships. The fun stuff.
- 20% to savings and debt payoff — money that builds wealth: retirement contributions, emergency fund deposits, brokerage investments, and any debt payments above the minimum.
If your needs exceed 50%, that’s a sign your fixed costs (especially housing) are squeezing your flexibility — common in expensive metros. Trim wants or raise income before sacrificing the savings bucket. The percentages are a starting point, not a law; tune them to match your stage of life.
Tip: Set up automatic transfers on payday so your savings bucket fills before you can spend it. “Pay yourself first” is the single most reliable way to hit the 20% target.
This calculator uses your monthly after-tax income and your chosen ratios — it does not account for irregular income, year-end bonuses, or one-time expenses. This is not financial advice.
The 50/30/20 rule is one of the most practical budgeting frameworks ever put to paper: take your monthly after-tax income, send 50% to needs, 30% to wants, and 20% to savings and debt payoff. No spreadsheet required, no tracking every coffee. This calculator applies that framework to your income instantly, shows you a dollar target for each category, and — if you enter what you actually spent last month — tells you exactly where you’re on track and where you’re not.
Monthly after-tax income — your take-home pay after all taxes have been withheld, from every income source combined. This is the number on your bank deposit, not your gross salary. Using gross income is the most common mistake people make when applying this rule, and it will make every target look artificially high.
Needs percentage — defaults to 50%, covering everything you’d still owe if your income stopped tomorrow: rent or mortgage, utilities, groceries, transportation, insurance premiums, and minimum debt payments. If your needs consistently run above 50%, housing costs are usually the culprit — a common reality in expensive cities. Bumping this percentage up while trimming wants is a reasonable adjustment, as long as savings doesn’t take the cut.
Wants percentage — defaults to 30%, covering discretionary lifestyle spending: dining out, streaming subscriptions, hobbies, gym memberships, vacations, and anything else you choose to spend on rather than must. This is also the easiest lever to pull when you need to free up money for savings.
Savings and debt payoff percentage — defaults to 20%, covering retirement contributions, emergency fund deposits, brokerage investments, and any debt payments above the required minimum. This bucket builds the financial future the other two categories can’t. If the 20% target is out of reach right now, start with whatever you can automate and work up from there.
What you actually spend or save — these three optional fields are where the calculator earns its keep. Enter your real numbers from last month and a progress bar fills for each category, showing whether you’re over, under, or on target. The unallocated income figure at the bottom tells you how much of your paycheck is still unaccounted for.
The percentages must add up to 100% for the targets to be accurate — the calculator will flag it if they don’t. And because this is a rule of thumb, not a law, adjusting the splits to fit your stage of life is entirely reasonable.
If your savings bucket is going toward debt payoff, the Debt Payoff Calculator shows how much time a consistent monthly payment saves you.
For the savings and investing portion of your budget, the Savings Goal Calculator turns a monthly contribution into a specific target and timeline.
Budgeting is a monthly view — for the annual picture, check your Net Worth Calculator to see whether you’re actually moving forward.
This calculator uses your monthly after-tax income and chosen ratios. It does not account for irregular income, year-end bonuses, or one-time expenses. This is not financial advice.