Budget Calculator

Use the Budget Calculator

Your results

Total monthly expenses: $0.00
Total monthly savings: $0.00
Monthly surplus or deficit: $0.00
Savings rate: 0.00%
Expense ratio: 0.00%

How this calculator works

What it does: Build a monthly budget, measure your savings and expense rates, and see whether your plan creates a surplus or deficit.
Inputs used: The estimate uses monthly after-tax income, housing, food, transportation, insurance, debt payments, subscriptions, entertainment, other expenses, and monthly savings/investing.
Calculation approach: The calculator applies the relationships defined for the budget calculator to those inputs and updates total monthly expenses, total monthly savings, monthly surplus or deficit, savings rate, and expense ratio.
How to read the result: Treat the result as a scenario based on the values entered. Compare a few reasonable inputs and consider costs, taxes, timing, or risks that the calculator does not include.

How to Use This Calculator

Enter Monthly after-tax income, Housing, Food, and Transportation using values that match the scenario you want to evaluate.
Enter Insurance, Debt payments, Subscriptions, and Entertainment using values that match the scenario you want to evaluate.
Enter Other expenses and Monthly savings/investing using values that match the scenario you want to evaluate.
Review the assumptions for the budget calculator, especially rates, time periods, and optional amounts.
Select Calculate to update the results, then adjust one input at a time to compare scenarios.

Understanding the Results

Total monthly expenses: The total monthly expenses estimated by the Budget Calculator using monthly after-tax income, housing, and food and the other values entered.
Total monthly savings: The total monthly savings estimated by the Budget Calculator using monthly after-tax income, housing, and food and the other values entered.
Monthly surplus or deficit: The difference between the current position and the calculated target or comparison value.
Savings rate: A percentage or comparison measure that summarizes the relationship between the calculator's key values.
Expense ratio: A percentage or comparison measure that summarizes the relationship between the calculator's key values.

Common Mistakes

Leaving out irregular expenses, annual bills, or small recurring charges.
Using gross income when the calculator asks for spendable or after-tax income.
Treating an ambitious contribution as sustainable without checking monthly cash flow.
Counting the same savings, asset, debt, or expense in more than one field.

Worked Example

Example inputs

Monthly after-tax income: $6,000
Housing: $1,800
Food: $600
Transportation: $500
Insurance: $400
Debt payments: $300
Subscriptions: $100
Entertainment: $300
Other expenses: $200
Monthly savings/investing: $1,000

Example results

Total monthly expenses: $4,200.00
Total monthly savings: $1,000.00
Monthly surplus or deficit: $800.00
Savings rate: 16.67%
Expense ratio: 70.00%

For this illustrative scenario, the total monthly expenses is $4,200.00. Changing any input can materially change the result, so use the example as a walkthrough rather than a guarantee.

Frequently asked questions

How does the budget calculator work?

It totals your monthly expense categories and planned savings, subtracts both from after-tax income, and calculates savings and expense percentages.

What should count as monthly after-tax income?

Use the income available to spend after taxes and payroll deductions. Include reliable take-home pay and other recurring net income you use for your budget.

What does a monthly deficit mean?

A negative result means planned expenses and savings exceed monthly income. You may need to reduce spending, lower the savings target temporarily, or increase income.

What is a good savings rate?

There is no universal target. A sustainable rate depends on income, fixed costs, debt, goals, and life stage. Consistency and gradual improvement matter more than one benchmark.

Should debt payments count as expenses or savings?

Required debt payments belong in expenses here. Additional principal payments can also be treated as expenses, though some people track them separately as net-worth building.

What does the Budget Calculator calculate?

Build a monthly budget, measure your savings and expense rates, and see whether your plan creates a surplus or deficit. The result is based only on the inputs and assumptions shown on the page.

How should I interpret the monthly surplus or deficit from the Budget Calculator?

Use it as an estimate for the scenario entered, not as a guarantee or personal recommendation. Test changes to monthly after-tax income, housing, and food to see which assumptions have the greatest effect.