How to use this calculator
- Enter shared expense, first household member income, second household member income.
- Choose a display currency, then select Calculate. Results also update after a brief pause while you edit.
- Read the result with the assumptions below. Export details or save a second scenario to compare your choices.
Formula and method
Each share=shared cost×individual income/combined income.
Assumptions and limitations
This is a chosen fairness rule, not a legal obligation; unpaid work, room size and other contributions are not valued.
Worked example
With shared expense = 2000, first household member income = 3000, second household member income = 2000, first share is approximately 1200.
What the result means
Split a household bill according to the incomes entered by two people.
Common questions
How should I interpret first share?
Split a household bill according to the incomes entered by two people.
What should I check before using this result?
This is a chosen fairness rule, not a legal obligation; unpaid work, room size and other contributions are not valued.
Methodology and transparency
Calculation specification reviewed on 2026-10-14. Mathematical implementation is tested against independent reference fixtures. This does not imply review by a licensed financial professional. Read the testing and precision policy.