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Money Calculators

Budget Calculator

Use this budget calculator to compare monthly income against housing, food, transportation, debt, savings, and other spending.

Last reviewed June 6, 2026Source note includedPlanning estimateNo expert review claimed

Live calculator

Budget calculator

Money left$750.00

Income minus listed spending and savings.

Total allocated$4,250.00

85.0% of monthly income.

Savings rate15.0%

Savings divided by monthly income.

Use this as a planning estimate. Taxes, fees, rates, account terms, provider policies, local rules, and timing can change real-world results.

Quick answer

Budget Calculator: what it calculates

Budget Calculator calculates money left from monthly income, housing, food, transportation, debt, savings, and other visible inputs. The visible formula is Money left = monthly income - listed monthly allocations.

ResultMoney left
InputsMonthly income, Housing, Food, Transportation, Debt, Savings, Other spending
FormulaBudget formula

Formula

Budget formula

Money left = monthly income - listed monthly allocations

Savings is treated as an allocation so you can see whether the full plan fits income.

How to use

Steps

  1. Enter monthly income.
  2. Add major monthly spending categories.
  3. Include savings as a planned allocation.
  4. Review money left and savings rate.

Example

Sample calculation

Monthly income$5,000
Total allocated$4,250
Money left$750

Calculator use

Best for

  • Use this budget calculator to compare monthly income against housing, food, transportation, debt, savings, and other spending.
  • Estimating savings, budget, debt, tax, interest, retirement, or net-worth scenarios before changing a money plan.
  • Comparing monthly contributions, withdrawals, balances, interest rates, payoff order, or tax assumptions with the math visible.
  • Preparing a planning number before checking account statements, tax rules, benefits, or professional advice.

Before relying on it

Check first

  • Treating an estimate as tax filing advice, investment advice, guaranteed return, or an official account balance.
  • Leaving out fees, taxes, inflation, irregular bills, employer benefits, penalties, changing rates, or timing differences.
  • Comparing scenarios with different time horizons, compounding assumptions, or gross versus after-tax amounts.

Details

What to know before using the result

These notes make the assumptions explicit, especially where the same search query can mean slightly different things.

Take-home basisBest for reality

Monthly take-home income usually gives a clearer budget than gross income because taxes and paycheck deductions are already removed.

Irregular costsConvert to monthly

Insurance, medical bills, gifts, repairs, subscriptions, and annual fees should be averaged into monthly amounts so they are not missed.

Savings lineTreat as planned

Savings is included as an allocation because a budget that only works after skipping savings may be too tight for goals or emergencies.

Source notes

References used for this calculator

Consumer Financial Protection BureauRecommends drawing up a realistic monthly budget and including savings contributions in spending analysis.Consumer Financial Protection BureauProvides a monthly budget worksheet for comparing income with expenses and money left over.

Benchmarks

How to read the result

The calculator is a decision aid, not a fixed rule. Use the output to compare scenarios and document your assumptions. Benchmark ranges are broad planning heuristics unless this page names a specific source for the range.

50/30/20: Common budget.

A simple framework: needs, wants, and savings/debt repayment.

0 or negative left: Tight.

The plan may need lower spending, more income, or revised savings targets.

10%+ savings: Progress.

A useful starting benchmark, though the right target depends on goals and debts.

Calculator accuracy

Methodology and assumptions

The formula, inputs, example, and limitations are shown so the result is checkable, not just a number in a box.

Formula

Money left = monthly income - listed monthly allocations

Inputs used

Monthly income, Housing, Food, Transportation, Debt, Savings, Other spending

Limitations

Money results are planning estimates. Actual taxes, account terms, rates, fees, timing, local rules, and provider policies can change the real-world result.

Last reviewed

June 6, 2026

Cite this page

Toolkit Shelf. Budget Calculator. Last reviewed June 6, 2026. https://toolkitshelf.com/tools/budget-calculator

FAQ

Common questions

How do I make a monthly budget?

List monthly income, subtract planned expenses and savings, then adjust until the plan fits.

Should savings count as an expense?

For planning, it helps to treat savings as a monthly allocation so it does not get spent accidentally.

What if my budget is negative?

A negative result means listed allocations are higher than income, so one or more assumptions needs to change.

Is this a final financial decision?

No. Use it for planning and comparison. Real decisions can change after exact rates, balances, fees, taxes, account terms, timing, and personal details are verified.

Why do finance calculators show assumptions?

Small changes in rates, payment timing, taxes, fees, balances, or income can materially change the result, so the assumptions need to stay visible.

Why might another calculator show a different output?

Different tools may use different rounding, assumptions, default rates, methods, formulas, or input timing. Compare the visible method and inputs before relying on the output.