WorldCalcs

Cost Split Calculator

Split a bill or shared expenses fairly — equally, itemized, or by custom shares.

Reviewed by the WorldCalcs team · Methodology · Last reviewed: July 2026

Splitting a shared cost should be simple, but it rarely is. One person covers the cabin, someone else buys the groceries, and a third pays for the fuel — then everyone tries to work out who owes what. This cost split calculator does the arithmetic for you. Enter a total and split it equally, add up itemized expenses and divide them, or give each person a custom share when they shouldn't all pay the same. It works with any currency and keeps every amount exact, down to the last cent.

Enter your figures above

All calculations happen in your browser. Nothing is sent, stored, or tracked.

Results are estimates and may contain errors — for general information only, not professional advice. Always verify before relying on them. Disclaimer

How to use

Equal split

Enter the total, the number of people, and — if you are splitting a restaurant bill — an optional tip and tax percentage. The calculator adds the tip and tax to the total, then divides by the number of people: per person = (total + tip + tax) ÷ number of people. When the total does not divide evenly, it rounds each share to the nearest cent and spreads the few leftover cents across the group, so the shares always add back up to the exact total.

Itemized expenses

List every shared cost with a label and an amount. The calculator keeps a running total as you add rows, then divides that total by the number of people. It is the easiest way to split a trip, a shared household, or a group gift where the costs are scattered across several receipts — including splitting fuel for a road trip.

Split by shares

Sometimes an equal split is not fair — one person stayed an extra night, or two people shared a larger room. Give each person a number of shares (nights, portions, or any weight you choose). The calculator adds up all the shares and hands each person their slice of the total: person's amount = total × (their shares ÷ total shares). The shares do not have to add up to any particular number; the calculator works out each proportion and reconciles the rounding so everyone's amounts sum to the exact total.

Worked example

Say six friends rent a cabin for a weekend. The shared costs are cabin 3 200, groceries 900, fuel 400, and firewood 300 — a total of 4 800. Split equally among six people, each pays: 4 800 ÷ 6 = 800 per person. Now suppose three of them instead split the 4 800 cabin by nights stayed: two booked four nights each and one booked two nights, so 4 + 4 + 2 = 10 shares. The shares mode gives: Person A (4 nights) 4 800 × 4/10 = 1 920; Person B (4 nights) 1 920; Person C (2 nights) 4 800 × 2/10 = 960. The three amounts add back up to exactly 4 800 — no rounding is lost.

Frequently asked questions

How do I calculate cost per person?+

Add up the total cost, then divide by the number of people sharing it. For example, a 4 800 total split among six people is 4 800 ÷ 6 = 800 each. If the total will not divide evenly, round each share to the nearest cent and add the few leftover cents to one or two people so the shares still sum to the exact total. The equal-split mode above does this for you automatically.

How do you split a bill fairly when people owe different amounts?+

Use the shares mode. Give each person a weight that reflects how much they should pay — nights stayed, portions eaten, or any number you choose. Each person then pays the total multiplied by their share of the combined weight. Someone with twice the weight pays twice as much, and the individual amounts always add up to the full total.

How do I split shared expenses in a group?+

List every expense with its amount in the itemized mode. The calculator keeps a running total as you add rows, then divides by the number of people, so you do not have to add up the receipts by hand. To settle up afterward, subtract what each person already paid from their equal share — anyone below their share still owes, anyone above gets paid back.

How do I add tip and tax before splitting a bill?+

In equal-split mode, enter the tip and tax as percentages. The calculator applies both to the total before dividing. A 250 bill with a 15% tip and 8% tax becomes 250 + 37.50 + 20.00 = 307.50, and that grand total is what gets split among the group. Leave the tip and tax at zero for a plain split.

What if the total does not divide evenly among everyone?+

The calculator rounds each person's share to the nearest cent, then distributes the small leftover so the shares add back to the exact total. For example, 307.50 split four ways is 76.875 each; the calculator has two people pay 76.88 and two pay 76.87, which comes to exactly 307.50. That way no money goes missing and no one is overcharged.

How do I split a cost by percentage or by shares?+

Percentages are just shares out of 100. In shares mode, enter each person's percentage as their weight — 50, 30 and 20, say — and the calculator splits the total in that ratio. You can also use plain shares like 3, 2 and 1; the tool adds them up and works out each proportion, so the numbers do not need to total 100.

Can I split a bill by the number of nights or days each person stayed?+

Yes. Put each person's number of nights (or days) into shares mode as their weight. If two people stay four nights and one stays two, enter 4, 4 and 2. The calculator divides the total in that 4:4:2 ratio, so the people who stayed longer pay proportionally more. It is a common way to split a holiday rental or a shared cabin.

Is this cost split calculator free and private?+

Yes. It is completely free, works with any currency, and runs entirely in your browser — nothing you type is sent anywhere or stored. Refreshing the page clears everything. Use it as often as you like for trips, dinners, rent, group gifts, or any shared cost.

Related calculators