A budget calculator adds up your monthly expenses and subtracts them from your income to show how much money is left over. Formula: Spent = housing + food + transport + utilities + other. Remaining = income – spent. On $5,000 a month with $3,300 of expenses, $1,700 remains.
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How to use the budget calculator
- Enter your monthly take-home income.
- Enter monthly costs for housing, food, transportation, utilities and other spending.
- Read total expenses and the amount left over.
What is the budget formula?
- Total expenses = housing + food + transportation + utilities + other
- Left over = monthly income − total expenses
- Share of income for each category = category ÷ income × 100
Use take-home pay, the amount that reaches your bank account after taxes and deductions, as income. If your pay varies, use a cautious average of recent months.
Budget calculator worked example
| Category | Monthly | Share of income |
|---|---|---|
| Housing | $1,500 | 30% |
| Food | $500 | 10% |
| Transportation | $300 | 6% |
| Utilities | $200 | 4% |
| Other | $800 | 16% |
| Total expenses | $3,300 | 66% |
| Left over | $1,700 | 34% |
With $5,000 of monthly income and the default expenses, spending totals $3,300 and $1,700 is left over, 34% of income. A negative result means you are spending more than you earn and need to cut costs, raise income or both.
How U.S. households spend
The Bureau of Labor Statistics Consumer Expenditure Survey reported average annual spending of $78,535 per household (consumer unit) in 2024, against average pre-tax income of $104,207. The largest shares of spending were:
| Category | Share of spending, 2024 |
|---|---|
| Housing | 33.4% |
| Transportation | 17.0% |
| Food | 12.9% |
| Personal insurance and pensions | 12.5% |
| Healthcare | 7.9% |
| Entertainment | 4.6% |
Housing and transportation together made up half of all spending. Comparing your own shares with these averages can show where your budget differs, though your costs will depend on where you live and your household size.
Building a budget step by step
- Track every expense for a month, or pull totals from bank and card statements.
- Separate fixed costs (rent, loan payments, insurance) from variable ones (groceries, fuel, dining out).
- List irregular costs, such as car registration or holidays, and divide each annual amount by 12.
- Enter the totals in the budget calculator and check what is left over.
- Give the leftover a job: an emergency fund, extra debt payments or savings goals.
The Consumer Financial Protection Bureau’s free budget worksheet follows the same income-minus-expenses approach and is a good place to record your numbers.
Tips if the numbers do not work
- Start with the largest categories; a cheaper phone plan saves less than a lower rent or car payment.
- Cancel subscriptions you no longer use.
- Pay high-interest debt first; the interest saved is a guaranteed return.
- Re-run the budget calculator each month, since a budget only works if it is kept current.
Estimates for education only, not financial advice. Your lender’s figures are final.
Popular budgeting methods
There is no single right way to budget, and the budget calculator works with any method. A zero-based budget assigns every dollar of income to a category, including savings, so that income minus all categories equals zero. The envelope method sets a cash or digital limit for each variable category, such as groceries or entertainment, and stops spending when the envelope is empty. A “pay yourself first” budget moves a fixed amount to savings on payday and lets you spend the rest freely, which suits people who dislike tracking.
Some people use percentage guidelines, such as putting about half of take-home pay toward needs, less than a third toward wants and the rest toward savings and extra debt payments. These are rules of thumb rather than official standards, and in high-cost areas housing alone can take far more than a third of income. Use the shares column of the budget calculator to see your own split, then adjust slowly; a budget you can actually keep is better than an ambitious one you abandon after a month.
Build an emergency fund early. Even a small buffer, such as one month of essential expenses, means a car repair or a medical bill does not have to go on a credit card. Once the buffer is in place, direct the leftover toward longer-term goals like retirement or a home deposit.
Related converters and calculators
Related calculators:
- Savings calculator: saving
- Debt-to-income calculator: debt ratio
- Loan calculator: loan payments
- Retirement calculator: retirement
To estimate how much cover your family might need, see the life insurance needs calculator.
Sources
U.S. Bureau of Labor Statistics: Consumer Expenditures 2024 (Dec 19, 2025); CFPB Your Money, Your Goals: Budget worksheet.
Questions about this calculator
Should I use gross or net income?
Net, take-home pay.
What if the result is negative?
You spend more than you earn; cut costs or raise income.
What share do households spend on housing?
33.4% of spending on average in 2024, per BLS.
How do I budget irregular costs?
Divide the yearly amount by 12 and include it monthly.
How often should I update my budget?
Every month.
Check the assumptions and units before relying on a result. Financial, tax and health estimates do not replace advice for your individual circumstances.
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