How this budget calculator works
The calculator converts each income and expense row to a monthly amount, groups rows by category, then subtracts listed expenses, savings and debt payments from listed income.
Frequency assumptions
Weekly amounts are multiplied by 52 and divided by 12. Fortnightly amounts use 26 payments per year. Quarterly and annual amounts are converted to monthly equivalents.
Savings and debt shares
Savings rate and debt payment share are shown as a percentage of listed income when income is greater than 0. They are context metrics, not spending rules.
What this calculator does not include
This is a manual calculator. It does not connect to bank accounts, store transactions, calculate tax changes, include one-off costs unless entered or give advice on how to change spending.
Key terms and assumptionsManual rows, frequency conversion, surplus or shortfall, savings rate, debt share and estimate limits.
- Manual rows
- Income and expense rows are entered manually. The calculator does not connect to accounts or store transactions.
- Frequency conversion
- Weekly, fortnightly, quarterly and annual rows are converted to monthly equivalents before totals are calculated.
- Surplus or shortfall
- Monthly surplus or shortfall is listed income minus listed expenses, savings contributions and debt payments.
- Savings rate
- Savings rate is savings rows as a share of listed income when income is greater than 0.
- Debt payment share
- Debt payment share is debt payment rows as a share of listed income when income is greater than 0.
- Region settings
- Region settings change defaults, labels and currency formatting only. They do not convert exchange rates or create country-specific results.
- General estimate
- The result excludes tax changes, live account balances and one-off costs unless those costs are entered manually.
Guides and methodology
Plain-English notes for choosing between detailed budget rows and broad budget-rule comparisons.
Related calculators
Browse the Money calculators hub for budget rules, savings targets, debt payoff and emergency-fund estimates.
- Budget Rule Calculator Compare current essentials, wants/fun and savings/investing buckets against 50/30/20, 65/20/15 or a custom budget rule.
- 50/30/20 Budget Calculator Split take-home income into needs, wants and savings or debt-payment buckets using 50/30/20 or custom percentages.
- Emergency Fund Calculator Estimate an emergency savings target, current shortfall and time to target from essential expenses and monthly savings.
- Savings Goal Calculator Estimate how long it may take to reach a savings goal, or the monthly contribution needed by a target date, with optional APY.
- Sinking Fund Calculator Estimate monthly or regular contributions needed for one or more planned expenses, annual bills or irregular costs.
- Debt Snowball Calculator Estimate a smallest-balance-first debt payoff schedule from balances, APRs, minimum payments and an extra monthly payment.
- Debt Avalanche Calculator Estimate a highest-APR-first debt payoff schedule from balances, APRs, minimum payments and an extra monthly payment.
- Credit Card Payoff Calculator Estimate credit card payoff time, total interest and the effect of optional extra monthly or one-off payments.
FAQs
Is this a budgeting app?
No. It is a manual calculator for entered income, expenses, savings and debt-payment rows, not an account-linked budgeting app.
Does it connect to my bank account?
No. It does not connect to accounts or store transactions.
Should I enter gross or take-home income?
Use whichever income basis you want to review. Take-home income is often simpler for a household cash-flow view.
How are weekly and annual amounts handled?
They are normalized to a monthly estimate using standard frequency conversions.
Does a shortfall mean I am doing something wrong?
No. It means the entered expenses are higher than the entered income in this estimate.
Does this include irregular expenses?
Only if you add them as rows. Use the sinking fund calculator for planned irregular costs.
How is this different from the emergency fund calculator?
The budget calculator summarizes income and expenses. The emergency fund calculator estimates a target reserve.
Is this financial advice?
No. It is a general estimate based on the values entered, not financial, tax, legal, accounting, investment or debt counselling advice.