Split Bill Calculator

Splitting a bill evenly sounds simple and still produces arguments, usually because the tip, the extras and the rounding get handled three different ways around the table. This calculator takes the bill, applies a tip percentage to it, adds any extras, and divides the whole thing by the number of people, so everyone is working from the same per-person figure.

The order matters. The tip is worked out on the bill alone, the extras go on top untipped, and only then is the total divided: (bill × (1 + tip ÷ 100) + extras) ÷ people. With the defaults that is 120 × 1.10 = 132, plus 10, which is 142, and 142 ÷ 4 is 35.50 each. Whether the tip is a percentage, a rounded-up total or nothing at all depends on where you are; the tip field accepts zero.

How to use it

The bill goes in as printed, before any tip. The tip percentage is whatever the group has agreed, or zero where service is already included. Extras are anything charged on top that is shared but not tipped, such as a booking fee, delivery, or a tax line added after the subtotal. The number of people is the headcount paying. The result shows the total with tip and extras, the tip amount on its own, and the per-person share.

What the result means

The per-person figure is an even split, which is fair when everyone ordered roughly the same and less fair when they did not. The total with tip and extras is what actually leaves the table. Where the split produces a fraction of the smallest coin or unit, someone ends up paying a little more, and the last section shows how little that is.

A worked example

Four people share a 120 bill and agree a 10% tip, and there is a 10 delivery charge on top. The tip is 12, the total with tip and extras is 142, and each person pays 35.50. Applying the tip to the extras as well would make it 35.75; this calculator tips the bill only, which is the usual treatment for a delivery fee or a tax line.

What moves the number most

Every input except the headcount adds to the total, and the headcount divides it. Doubling the extras from 10 to 20 lifts the share from 35.50 to 38.00. Raising the tip from 10% to 15% takes it to 37.00. Adding a fifth person drops it to 28.40, and doubling the bill to 240 doubles the tipped part but not the extras, giving 68.50 rather than 71.00. The headcount has the most reach, because it scales everything at once.

The formula behind this

Bill multiplied by one plus the tip percentage over 100, plus extras, divided by people. The tip is a percentage of the bill only. Extras are added as a flat amount and are not tipped. Rounding is left to the reader: the calculator shows the unrounded figure, and a group that rounds each share up to the nearest unit pays slightly more in total than the bill.

What the bill doesn't show

An even split hides two things. The first is who ordered what; a shared figure is easy, and a fair one takes each person's items with the tip on top, which this calculator does not attempt. The second is the difference between a tip and a service charge. Tipping is a custom rather than a law, which is why it has its own research literature. A Cornell review of tipping in restaurants around the globe describes it as an expense diners are free to avoid, called for by social norms but not legally required, with norms that differ from country to country. A service charge is different in kind. In the United States the tax authority treats a service charge added by the business as wages rather than a tip, and a charge already printed on the bill is money that has been added once, so a tip rate of zero avoids adding it twice. Then there is the remainder: 142 split three ways is 47.33 each, which comes to 141.99, so one person pays 47.34. The shortfall is at most one smallest unit per person, however large the bill.