Example 1
- Income: 7,500
- Expenses: 5,800
Balance +1,700
Spending 77.3% · Savings 22.7%
What is left at 7,500 income and 5,800 expenses? → +1,700 (savings rate 22.7%).
Monthly Budget Calculator
Subtract expenses from income to see balance, savings rate, and 50/30/20 plus 70/20/10 targets. At 7500 and 5800 you keep +1700 (77.3% spent). Optionally add debt payment, month compare, and categories.
Result
Enter income and expenses. The result appears here.
Balance = income − expenses. 7500 and 5800 leave +1700. Months of cushion live on the emergency fund page.
How results are calculated
Income7500
−Expenses5800
→Balance+1700
This household budget starts from two monthly totals: income and expenses. Balance = income minus expenses. Expense share = expenses ÷ income × 100%. Savings rate (surplus share) = balance ÷ income × 100%. Keep both amounts in the same convention: both net or both gross.
At 7500 and 5800 the balance is +1700, expenses 77.3%, savings rate 22.7%. At 4200 and 4150 only 50 remains (1.2%). At 5000 and 5900 the balance falls to −900 and expenses reach 118% of income.
Beside the balance the calculator shows teaching targets from income: 50/30/20 (needs / wants / savings) and 70/20/10. These are not bank rules — they exist to compare against your real expense total.
In options you can enter a debt payment (subtracted from the balance), previous-month income and expenses (balance delta), and actual needs, wants, and savings. The category sum is a separate row and does not replace the main balance.
The result bar shows expense and surplus shares plus both target sets. The emergency-fund page divides savings by the same monthly expenses: 15,000 at 5,000 is 3 months. The result is a sketch — a forgotten subscription or quarterly bill changes the month.
Article hook: at 7500 income, 50/30/20 would hold needs at 3750 while you spend 5800 — the balance is still +1700. A 1700 surplus at 5800 expenses is about 0.3 months of cushion on the emergency-fund page.
Formula
balance = income − expenses
expense share = expenses / income × 100% (when income > 0)
savings rate = balance / income × 100%
leftover after debt = balance − debt payment (optional)
Teaching targets from income: 50/30/20 and 70/20/10. Month compare = current balance − previous balance.
How to use the calculator
- In Monthly income, enter that month's inflows, for example 7500. Keep net or gross consistent.
- In Monthly expenses, enter fixed plus typical variable costs from the same month, for example 5800.
- Click Calculate. At 7500 and 5800 the balance should be +1700, spending 77.3%, surplus 22.7%.
- If you land in the red, as with 5000 and 5900 (−900), first check that both sides use the same frame.
- Months of cushion live on the emergency-fund page, using the same expenses.
Monthly balance and the spending share
Balance = income − expenses. At 7500 and 5800 you keep 1700, and spending takes 77.3% of inflows. 5000 and 5900 leave −900.
- Balance
- Income minus expenses for that month. 7500 − 5800 = +1700. At 4200 and 4150 only +50 remains.
- expenses
- The Monthly expenses field, numerator of the share. 5800 / 7500 ≈ 77.3%. At 5900 / 5000 the share hits 118%.
- income
- The denominator of both shares. Keep the same net-or-gross frame as expenses. 7500 against 5800 is a 22.7% surplus share.
Usage examples
Example 2
- Income: 4,200
- Expenses: 4,150
Balance +50
Spending 98.8% · Savings 1.2%
What is left at 4,000 and 3,950? → +50. A thin buffer — one bill can push you into deficit.
Example 3
- Income: 5,000
- Expenses: 5,900
Balance −900
Spending 118% · Savings −18%
What is left at 5,000 and 5,900? → −900. A deficit calls for cutting expenses or extra income.
Related calculators
FAQ
How is the balance counted?
Balance = income − expenses. At 7500 and 5800 the result is +1700. At 5000 and 5900 it is −900.
What is the savings rate?
It is surplus ÷ income × 100%. At +1700 and 7500 that is 22.7%. A deficit makes the share negative.
What is 50/30/20?
A teaching split of income: 50% needs, 30% wants, 20% savings. At 7500 that is 3750 / 2250 / 1500. It is not a bank rule.
What is 70/20/10?
Another teaching split: 70% needs, 20% savings, 10% fun. At 7500 that is 5250 / 1500 / 750. It shows beside 50/30/20.
Must expenses equal 50+30?
No. The calculator shows income targets beside your real balance. Your 5800 can differ from the 6000 implied by 50+30.
What does optional debt payment do?
It subtracts from the balance to show leftover after debt. At +1700 surplus and a 500 payment, leftover is +1200. It is not a loan schedule.
How does month comparison work?
Enter previous-month income and expenses. The calculator shows that balance and the change versus this month. At +1700 now and +1300 before, the delta is +400.
Why are there actual category fields?
Optionally enter needs, wants, and savings for this month. The category sum is a separate row — it does not replace the main balance.
How does the emergency-fund bridge work?
Enter the same monthly expenses on the emergency-fund page. Surplus ÷ expenses says how many cushion months one surplus month builds.
Should income be net or gross?
Keep both sides in the same convention. Mixing them breaks shares and the savings rate.
What does the result bar show?
Expense and surplus (or deficit) shares of income, plus 50/30/20 and 70/20/10 targets. It visualizes the same numbers, not a second model.
Is the result credit advice?
No. It is the difference of entered numbers plus teaching income splits.
What if income is zero?
Balance still computes, but percent shares need income greater than zero — otherwise there is no division by zero.
Do quarterly bills belong in one month?
Yes if you enter them here. Averaging them monthly keeps one month from looking like a false deficit.
What are expense categories for?
They are an optional teaching breakdown (housing, food, transport, health, fun, other). The line sum does not replace Expenses — it shows each item as a share of income.
What do income × 12 and expenses × 12 mean?
A simple annual scale of the monthly figures: income × 12, expenses × 12, and balance × 12. They ignore bonuses and seasonal swings.
What is the 30% housing cap?
The calculator shows 30% of monthly income as a teaching ceiling for housing costs. At 7500 income that is 2250. It is not a bank rule.
What does “surplus ≈ emergency months” mean?
When the balance is positive, the figure is balance ÷ expenses. At +1700 and 5800 expenses that is about 0.3 months of expenses from this month’s surplus alone.
Must the category sum equal expenses?
No. Categories are optional. You can fill only some lines. Balance always uses the Income and Expenses fields.
Does the debt payment belong in Expenses?
You can include the installment in Expenses or enter it separately under debt payment. The separate field subtracts from the balance and shows leftover after debt — do not double-count the same amount in both places.
How do I make a monthly household budget in this calculator?
Enter monthly income and expenses in the same convention (usually take-home pay), then use the Calculate control. Balance is income minus expenses. The 50/30/20 and 70/20/10 targets and the savings rate are computed from income automatically.
How much should I save under the 50/30/20 rule?
Under 50/30/20, savings (and extra debt paydown) get 20% of income. At 7,500 that is 1,500. It is a teaching target, not a bank rule — your actual balance can differ.
How is this different from an emergency fund calculator?
This page computes the monthly balance and income-split targets. An emergency-fund page uses expenses and a cushion-months goal. Bridge: move a surplus from the budget into how fast the cushion grows.
Knowledge sources
Balance is income minus the expenses you enter. This is a month sketch, not a financial plan.
Page updated in 2026.