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Bill split calculator: equal, income-based or custom

Compare ways to split rent, utilities and other shared bills as a couple or household. Add monthly take-home incomes and what each person already paid to see contributions and a settlement plan.

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Which split should you choose?

Equal

Equal works well when the group has similar financial room or values the clearest possible rule.

By income

Income-based sharing follows each person’s share of combined take-home income and can reduce strain when earnings differ.

Custom

Custom percentages suit different room values, temporary leave or another explicit agreement. Lock any shares that should stay fixed while the remaining percentages rebalance to total 100%. At least one share always remains unlocked.

How to split bills based on income

Your contribution = shared bills × (your net income ÷ combined net income).

Illustrative example: Alex takes home 36,000 kr and Sam 24,000 kr a month. For 18,000 kr in shared bills, the split is 60/40: Alex contributes 10,800 kr and Sam 7,200 kr. An equal split would be 9,000 kr each.

Use the same period for both incomes and the bills. Agree what counts as shared and check that the contributions fit both budgets. This example is separate from your calculator entries.

Read the guide to splitting bills based on income

How the calculator works

  1. Add at least two people and their monthly net incomes.
  2. List only the bills the household has agreed to share.
  3. Choose equal, income-based or custom percentages.
  4. Record what each person paid. Direct settlement is for exactly two people; larger groups use Household.

The calculation stays in the browser tab. The currency preference is saved in this browser; calculator entries are not saved or sent to Billum.

Turn the calculation into a monthly routine

Once you agree on a split, use Billum to track shared bills, what each person paid and recorded repayments month by month. Keep personal spending in your own view. Your calculator entries are not transferred to an account, and Billum does not move money for you.