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Bill Split Calculator

Split bills proportionally by income — everyone pays their fair share.

Details

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Fair Split

Enter a bill amount and incomes to see the split.

Frequently Asked Questions

Divide each person's income by the total combined income, then multiply by the bill amount. E.g. Person A earns £30k and Person B earns £20k on a £1,000 bill: Person A pays £600, Person B pays £400.
Yes. An equal split means someone earning £20,000 pays the same pounds as someone on £60,000, but it takes three times more of their income. Income-proportional splitting means everyone gives the same percentage of what they earn.
Yes — this works for any shared expense. Enter the total amount and each person's income, monthly or annual.
Yes, click "Add person" to include as many people as needed. The calculator recalculates instantly.

How to Split Bills Fairly by Income

When people with different incomes share expenses, splitting equally can be unfair. Someone earning £20,000 paying the same as someone earning £60,000 means the lower earner spends three times more of their income on the same bill. Income-proportional splitting fixes this — everyone contributes the same percentage of their earnings.

The Formula

Each person's share = (Their income ÷ Total combined income) × Bill amount

Worked Example: Splitting Rent

Alice earns £2,500/month. Ben earns £1,800/month. Their rent is £1,200/month.

Combined income: £4,300. Alice's share: (2,500 ÷ 4,300) × 1,200 = £697.67. Ben's share: (1,800 ÷ 4,300) × 1,200 = £502.33.

Both pay 27.9% of their income — genuinely fair. With a 50/50 split, Alice would pay 24% of her income while Ben pays 33.3%.

When to Use Income-Based Splitting

This approach works best for ongoing shared expenses: rent, energy bills, council tax, broadband, groceries, and streaming subscriptions. For one-off meals or social events, a simple equal split is usually easier and more appropriate. Use the tip calculator for restaurant bills with tips.

Three or More People

The calculator handles any number of people. In a house share with four people on different salaries, each person's share is automatically calculated proportionally. Click "Add person" to include everyone.

Related Calculators

See the tip calculator for splitting restaurant bills with tips, the salary calculator to work out your monthly take home pay, or the percentage calculator to work out income ratios.

KwikSum's bill split calculator divides any shared expense proportionally based on income. Whether you're splitting rent, a restaurant bill, a holiday, or a household subscription — enter the total and each person's income to get a fair, instant breakdown of who pays what.