50/30/20 Budget Calculator

The 50/30/20 rule is the simplest budget most people can stick to: half your take-home pay covers needs, a third covers wants, and the rest goes to savings or extra debt payments. This calculator does the maths for you and shows the weekly version too, which is usually the number that actually changes behaviour.

How the three buckets work

Needs (50%) are the things you would still pay for in a bad month. Rent or mortgage, utilities, groceries, transport to work, insurance, and the minimum payments on any debt. If you stopped paying it, something would break — that is the test.

Wants (30%) are everything that makes life pleasant but optional. Eating out, streaming, hobbies, holidays, the nicer supermarket, upgrades you did not strictly need. This bucket is not a failure. It is the part of the budget that stops the whole thing collapsing in week three.

Savings and extra debt (20%) covers your emergency fund, sinking funds for known future costs, and any payment above the minimum on a debt. Overpaying a credit card belongs here rather than in needs, because the minimum is the obligation and everything above it is a choice.

Why use take-home pay, not gross

The rule only works on the money that actually lands in your account. Gross pay includes tax, and budgeting against a number you never receive is how people end up short every month. Use the figure on your bank statement, not the one on your contract.

If your pay changes month to month, use your lowest recent month rather than your average. A budget built on a good month quietly assumes every month is a good one.

When 50/30/20 does not fit

The classic split assumes housing is affordable, and in a lot of cities it simply is not. If rent alone is over half your take-home pay, the 50% needs bucket is already gone before groceries.

That is not a sign you have failed the rule — it is a sign the rule needs adjusting. The calculator includes three alternatives:

• 60/20/20 keeps savings intact and takes the extra from wants. This is the usual fix for high rent.
• 70/20/10 is a survival split for a genuinely tight stretch. Savings drop to a token amount, but they do not disappear, which matters more than the size.
• 40/30/30 is for people with room to push harder — often a household with two incomes or someone clearing debt aggressively.

Pick the one that matches this month, not the one you wish described you.

How to actually use the numbers

The comparison step matters most. The calculator tells you where the money should go; last month's bank statement tells you where it did. The gap between those two numbers is your actual budget, and closing one bucket at a time works far better than trying to fix all three at once.

A note on the savings bucket

If you have no emergency fund yet, send the entire savings bucket there until you have a starter cushion of around $1,000. It is the cheapest insurance you will ever buy, and it stops the next surprise bill from becoming next month's credit card balance.

Once that cushion exists, split the bucket between building the fund up to a few months of essentials and clearing any high-interest debt.

Read the full guide

For the reasoning behind each bucket and what to do when the numbers refuse to balance, read our companion guide on the 50/30/20 budget rule explained simply.