Monthly Budget Calculator — Where Does Your Money Go

Building a monthly budget that actually holds up

A budget only works if it reflects real numbers, not aspirational ones. This calculator adds up spending across the categories most households track — housing, transportation, food, utilities, insurance, debt payments, savings, and everything else — and compares the total to your income, so you can see immediately whether you're spending more than you earn.

Treating "savings" as its own line item, rather than whatever happens to be left at the end of the month, is deliberate: budgets that pay savings last tend to shrink it first when money is tight. Putting a number in that field and holding to it, the same way you would a bill, is one of the more reliable ways to actually save consistently.

A rough benchmark: the 50/30/20 split

One common framework suggests roughly 50% of after-tax income toward needs (housing, utilities, minimum debt payments, groceries), 30% toward wants (entertainment, dining out, subscriptions), and 20% toward savings and extra debt payoff. It's a starting point, not a rule — housing costs alone push many budgets well past 50% in expensive cities, and that's fine as long as the other categories flex to compensate.

If the leftover amount is negative, the fastest fixes are usually the largest categories first — housing and transportation — rather than trimming small discretionary items. Once you have a savings number that fits, the Savings Goal Calculator or Emergency Fund Calculator can help you point it at a specific goal.

Frequently asked questions

What income should I enter — gross or net?

Use your net (after-tax) income. Budgeting against gross income overstates what you actually have available, since taxes are deducted before you ever see the money.

What if my leftover amount is negative?

That means your allocated categories add up to more than your income — a sign to trim spending somewhere. Start with the largest categories (housing, transportation) rather than small discretionary ones, since a 10% cut on a big category usually beats eliminating a small one entirely.

Is the 50/30/20 rule realistic everywhere?

Not always — it's a general benchmark, and housing costs in expensive cities routinely exceed the 50% "needs" guideline on their own. Use it as a rough comparison point rather than a strict target.

Where should extra leftover money go?

That depends on your goals: building a safety net first with the Emergency Fund Calculator is usually the priority before other goals, followed by a specific target with the Savings Goal Calculator or long-term investing with the Retirement Savings Calculator.