Bill Split Calculator — Equal, Itemised or Proportional

Work out what each person owes when the orders were not the same. Split equally, by exact items or in proportion to what each person had, with shared dishes divided properly and the rounding handled rather than ignored. Groups of 2 to 20, any currency.

Created by Ashar PervaizLast updated 24 October 2026

Equal Is Simple. Fair Is Sometimes Different.

Splitting a bill equally is the default because it is fast and because proposing anything else feels awkward. It is the right answer when everyone ordered roughly comparably. It stops being the right answer the moment one person had a starter, three courses and half the wine while another had soup and tap water.

The argument for equal splitting over many meals is that it averages out — you overpay one week and underpay the next. That works for a regular group and not at all for a one-off gathering of people who will not eat together again.

Where the Tip Goes in the Split

The tip is an input here rather than the subject. Whether it is 18 per cent or nothing at all depends on which country you are sitting in, and that question has its own page — the tip calculator covers what is customary in fifteen of them, and whether a service charge is already on your bill.

What matters for the split is where the tip lands. Added to the whole bill and divided by heads, everyone pays the same gratuity regardless of what they ordered. Applied to each person's own subtotal, the person who had the steak pays more of it. Neither is wrong, but mixing them is: itemising the food and then splitting the tip equally is the single most common way a carefully fair split stops being fair.

Itemising Properly, Including Shared Dishes

The mistake in itemised splitting is handling shared items badly. Assign what each person ordered, divide shared dishes among the people who actually ate them, then apply tax and tip to each person in proportion to their own subtotal rather than equally.

Each person's share =
 (their items + their portion of shared items)
 × (1 + tax rate)
 × (1 + tip rate)

Applying tip and tax proportionally is the step people skip. Splitting the food itemised and then dividing the tip equally quietly transfers money from the light eaters to the heavy ones, which defeats the point of itemising in the first place.

A worked example. Three people: A orders 20, B orders 45, C orders 35, and they share a 30 platter equally. Subtotals become 30, 55 and 45, totalling 130. With 8% tax and an 18% tip on the pre-tax amount, the multiplier is 1.08 plus 0.18 of the subtotal — so A pays 30 × 1.26 = 37.80, B pays 69.30, and C pays 56.70.

The Rounding Problem

Three people splitting 100 each owe 33.333… and no arrangement of coins produces that. Somebody has to absorb the difference.

• Round everyone up and let the payer keep the excess. Three payments of 33.34 total 100.02. Simple, and the payer is marginally ahead.
• Round down and have one person cover the remainder. Two pay 33.33 and one pays 33.34. Exact, and requires someone to volunteer.
• Let the person paying the bill absorb it. They are already carrying the transaction and often the loyalty points.

For a group that eats together regularly, rotating who absorbs the rounding is neater than recalculating it each time. Over a year the amounts are trivial; the friction of deciding each time is not.

The Awkward Situations, Solved

Someone did not drink. Alcohol is usually the largest single distortion on a restaurant bill. Split the drinks separately among the people who had them, then split the food however the group prefers. This is the one adjustment almost everyone accepts without discussion.

Someone arrived late or left early. Charge them for what they had rather than trying to prorate by time. Time-based apportionment sounds fair and is fiddly, contentious, and rarely matches what anyone consumed.

One person is paying for two. Count them as two people, not one. Splitting a bill by heads present rather than by people fed is a common and expensive slip when children are at the table.

A birthday meal. Divide the guest of honour's share among everyone else before splitting, rather than after — the arithmetic is the same but the conversation is easier when it is settled up front.

Doing It at the Table

One shortcut covers almost every split without a phone.

For the split: round the total up to something divisible by the group size before dividing. A 137 bill among four is awkward; treating it as 140 gives 35 each and leaves a small surplus toward the tip, which is usually the intention anyway.

For splitting shared household costs rather than a single bill, the rent calculator covers dividing rent by room size or income, and the percentage calculator handles any proportional share you need to work out separately.

Bill Splitting Questions