50/30/20 Budget Calculator
Split your monthly take-home pay into 50% needs, 30% wants, and 20% savings — then compare it with what you actually spend. Free, private, no signup.
After tax — what actually lands in your account.
Annual is divided by 12.
On $4,000 a month ($48,000 a year), your targets are:
Things you'd still have to pay for if you lost your job tomorrow — the bills that keep a roof over your head and you getting to work.
- •Rent or mortgage payment
- •Groceries and utilities
- •Insurance and minimum debt payments
- •Transport to work — fuel, transit pass, car payment
Everything you choose rather than have to. Cutting these hurts your weekend, not your housing — which is exactly what makes them the flexible part of the plan.
- •Eating out, coffee, and takeaway
- •Streaming, apps, and subscriptions
- •Travel, hobbies, and concerts
- •Clothes and gadgets beyond the basics
Money that builds your position instead of maintaining it: cash you set aside, plus anything you pay toward debt above the minimum.
- •Emergency fund top-up
- •Retirement or investment contributions
- •Extra payments above minimums on debt
- •Sinking funds for a car, a move, or a trip
Where the 50/30/20 rule comes from
The split was popularised by Elizabeth Warren — then a bankruptcy law professor at Harvard, later a US senator — and her daughter Amelia Warren Tyagi in their 2005 book All Your Worth: The Ultimate Lifetime Money Plan. Their argument was that most budgets fail because they track dozens of categories nobody can sustain. Three buckets you can hold in your head beat forty line items you abandon in March.
The math is deliberately blunt: take your monthly take-home pay, then allocate 50% to needs, 30% to wants, and 20% to savings and extra debt payments. On $4,000 a month that's $2,000, $1,200, and $800. The point isn't precision — it's having a ceiling on the flexible spending so the savings line stops being "whatever is left over," which in practice is usually nothing.
Use the comparison panel to put your real numbers next to the targets. Most people find needs and savings roughly where they expect and the wants bucket is the surprise. That gap is the useful output of this exercise — it tells you the one number to move, rather than handing you a list of thirty things to feel guilty about.
The 20% transfer is the part that only works if it actually happens every month, which makes it a habit rather than a decision. Set it as a recurring monthly check-in in HabitBox: move the money, tap once, keep the streak. HabitBox is a habit tracker for iOS and Android that needs no account and keeps your data on your device.
Frequently asked questions
What is the 50/30/20 rule?+
It's a budgeting framework that splits your after-tax income three ways: 50% to needs (housing, food, utilities, transport, minimum debt payments), 30% to wants (dining out, subscriptions, travel, hobbies), and 20% to savings and paying down debt faster than the minimum. It was popularised by Elizabeth Warren and Amelia Warren Tyagi in their 2005 book All Your Worth: The Ultimate Lifetime Money Plan.
Should I use gross or take-home pay?+
Take-home pay — what actually lands in your account after tax and any payroll deductions. If your employer already deducts a retirement contribution before you see the money, that contribution is effectively part of your 20%, so you can count it toward that bucket rather than double-saving.
What if my rent alone is more than 50% of my income?+
That's common in expensive cities, and it doesn't mean the framework is useless. Treat 50/30/20 as a target to move toward, not a pass/fail test. If needs run at 65%, the realistic move is to trim wants toward 20% so savings survives — or to work on the big lever (housing, transport, income) over the next year rather than blaming the coffee.
Does the 20% include paying off debt?+
Yes, above the minimums. Minimum required payments are a need — you have to make them. Anything extra you throw at a credit card or loan counts toward the 20%, because it's buying down future obligations the same way saving builds future assets.
Is this calculator free and private?+
Yes. It runs entirely in your browser — your income and spending figures are never sent to a server, stored, or attached to an account. Refresh the page and everything is gone.
Make the 20% transfer a habit
A budget only works if the savings transfer actually happens. Set a recurring monthly money check-in in HabitBox, tap it the moment the transfer clears, and watch the streak build. Habit tracker for iOS and Android — no account, data stays on your device.
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