Toolkit Shelf

Money Calculators

Budget Calculator

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

Reviewed May 25, 2026EstimateFormula shown

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.

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

  • Quick money left from monthly income, housing and food.
  • Personal finance scenarios before changing a budget, loan, savings goal, or purchase plan.
  • Monthly cash flow, affordability, debt payoff, or future-value estimates.
  • Assumption checks before talking with a lender, tax preparer, employer, or financial professional.

Before relying on it

Check first

  • Entering monthly income, housing and food from different time periods or scenarios.
  • Mixing gross income, take-home income, one-time costs, and monthly costs in the same comparison.
  • Forgetting taxes, fees, insurance, irregular bills, or minimum payments when using an estimate.
  • Treating a planning estimate as a quote, tax filing result, approval decision, or guaranteed return.

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.

50/30/20Common budget

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

0 or negative leftTight

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

10%+ savingsProgress

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

Results are estimates for quick planning and should be checked before important financial, legal, tax, health, or business decisions.

Last reviewed

May 25, 2026

Cite this page

Toolkit Shelf. Budget Calculator. Retrieved May 25, 2026, from 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.