How to split expenses with friends: who owes whom?

To split expenses equally, add up the shared purchases and divide by the number of people. Subtract each person's share from what they paid. A positive balance is money to receive; a negative balance is money to pay back. If people joined different activities, calculate their shares expense by expense.

Calculate the shares for your group

• Calculate who owes whom: enter what each person paid and who shared each expense.
• Split a restaurant bill: each person's order plus their share of shared items.
• Split a vacation rental: compare methods when people stay different numbers of nights.
• Split the rent: use the weights agreed with your roommates.

These calculators are free and work without an account. The repayment calculator accounts for who paid; the restaurant, rental and rent tools calculate each person’s cost share.

Three friends, $300: who owes whom?

In this fictional weekend, Catherine pays $180 for the accommodation, Alex pays $90 for groceries and Lou pays $30 for dinner. All three agree to share every expense equally. The total is $300, so each person's share is $100.

Alex pays Catherine $10. Lou pays Catherine $70. Those two repayments bring everyone's final cost to $100. Catherine's $180 advance was not her share: $80 of it covered the other two people.

You can check the result: Catherine paid $180 and received $80; Alex paid $90 plus $10; Lou paid $30 plus $70. Each ends up paying $100.

What if someone has already paid you back?

Suppose Lou already sent Catherine $20. Keep the original $30 dinner expense and record the $20 repayment separately. Lou now owes $50, Alex still owes $10, and Catherine has $60 left to receive.

Do not add that $20 to the weekend's expenses: the group still spent $300. Counting a repayment as another purchase would inflate the bill. Confirm the payment with its recipient before treating it as received.

Equal, weighted or exact: which split should you use?

• Equal: everyone shares the same cost. A $90 grocery shop for three is $30 each.
• Weighted shares: the group agrees on different weights. For a $120 cost split 2:1:1, the shares are $60, $30 and $30.
• Exact amounts: each person's portion is known, such as individual restaurant orders. Check that the portions add up to the bill.

Keep the last cent in the calculation. Splitting $100 between three people gives $33.34, $33.33 and $33.33. Agree who takes the extra cent. Rounding every share down to $33.33 would leave one cent unpaid.

Decide who is included for each expense. If only Catherine and Alex attend an $80 activity, they owe $40 each for it; Lou's share is zero. Being in the group does not automatically mean sharing every purchase.

Staying different numbers of nights? Use the vacation rental split calculator to compare the two methods before booking. A couple may count as two people for food and one room for accommodation: agree on the unit before doing the math.

For the household, the guide to splitting roommate groceries and bills shows how to separate personal purchases, meals for two and household expenses before calculating repayments.

What should you write down?

For a trip, the free group trip budget template for Excel and Google Sheets lets you compare planned and actual costs. Use it to agree on the budget before booking; the balances above explain who owes whom once someone has paid.

A shared note, spreadsheet or expense app can hold the same information. For each expense, keep the date, description, amount and currency, who paid, who took part and the split. Keep repayments in a separate list with the sender, recipient, amount and date.

1. Add the receipt once, even if several people photographed it.
2. Check participants and amounts together while the purchase is still fresh.
3. Count payments already made before asking for the remaining balance.
4. Agree when to close the accounts, for example the evening the trip ends.

For mixed currencies, choose a common calculation currency and agree which exchange rate to use. Keep the original amounts so everyone can check the conversion. Do not add dollars and euros as if they were the same unit.

How do you ask for the remaining amount?

Send the calculation with the request. For Lou, after the first $20 repayment:

Your share of the weekend is $100. You paid $30 for dinner and already sent me $20, so there's $50 left. Here's the breakdown. Does everything look right?

An app can make the amount easier to check. Agreeing on a date and confirming the payment still require the people involved.

How does Spliz help?

In Spliz, add the shared expenses, choose their participants and split, and see each person's balance. The useful check stays the same: how much, to whom, and which entries explain it.

Recording an expense does not move money. Pay back by bank transfer, in cash or with your payment app, then record the repayment in Spliz after confirming receipt. A calculated balance is not proof of a completed payment.

The same record works for group trips and shared household expenses. Two common cases have their own guide: concert and festival tickets and a taxi ride with several stops. If you are choosing an app, see our comparison of expense tracking and payment features.

Method and sources

The people and amounts above are fictional. The arithmetic is shown in full and assumes one currency, with no payment fees. Actual fees or exchange costs must be accounted for separately if your group shares them.

• What Spliz does today, available features and what is still in preparation.
• Vacation rental calculations, two worked methods for different lengths of stay.