Couples expense split calculator
Compare equal contributions with a split based on each person’s net income for the same period. Proportional contributions equalise relative effort; they do not decide which agreement is fair for you.
Your shared budget
Calculations run in this browser. These fields are not sent or saved. Enter amounts without thousands separators; use a comma or decimal point.
Equal shares (50/50)
- Person A
- 750,00 €
- 41,67 % of their income
- Person B
- 750,00 €
- 27,78 % of their income
Proportional to income
- Person A
- 600,00 €
- 33,33 % of their income
- Person B
- 900,00 €
- 33,33 % of their income
Calculation and rounding
Equal shares: shared expense ÷ 2. Proportional: shared expense × individual income ÷ combined income. Effort is contribution ÷ individual income × 100. Cents are allocated by largest remainder, with A first on ties. Contributions always add up to the shared expense.
A fictional, reproducible example
With net incomes of €1,800 and €2,700 and shared expenses of €1,500, equal contributions are €750 each: 41.67% and 27.78% of their incomes. Proportional contributions are €600 and €900: approximately 33.33% each. These are the calculator’s initial values.
Use income and expenses from the same period. For variable income, you can agree on a comparable average. Care responsibilities, debts and other needs also matter when agreeing a split. A zero proportional payment does not mean someone contributes nothing in other ways.
Method checked on 8 November 2026.
Frequently asked questions
Do we need a joint account?
No. You can pay from separate accounts and record who paid and each person’s share. This calculator compares contributions; it does not connect accounts or move money.
Is an income-based split always fairer?
No. It approximately equalises the share of income going to shared costs, but care responsibilities, needs and personal agreements also matter.
Are our incomes saved?
No. Calculator amounts are processed in the browser and are not sent or saved. You can use fictional figures to test scenarios.