Tip Calculator – Split the Bill and Work Out the Gratuity

To work out a tip, multiply the bill by the tip percentage and divide by 100: 18% on an 85.00 bill is 85 × 18 ÷ 100 = 15.30, for a total of 100.30. In US restaurants 15–20% of the pre-tax bill is the standard range, with 18% a common middle; to split it, add the tip first and then divide by the number of people — four ways, that is 25.08 each.

Work out the gratuity, add it to the bill, and split the total across your table. The calculator handles the awkward part — dividing an amount that does not go evenly — and can round up so nobody is left counting out small change. The arithmetic is the same as any other percentage-of-a-number problem, which the percentage calculator covers in general form.

How the calculation works

A tip is a straightforward percentage of the bill:

Tip = Bill × (Percentage ÷ 100)
Total = Bill + Tip
Each person pays = Total ÷ Number of people

The order matters. Add the tip to the bill before dividing, not after. If four people each round their own share to the nearest unit, the total collected will usually miss the real bill by a few units in one direction or the other.

Working out a tip in your head

You rarely need a calculator for this, and the method is worth knowing.

• 10% — move the decimal point one place to the left. On 62.40, that is 6.24.
• 20% — find 10% and double it. 6.24 becomes 12.48.
• 15% — find 10%, then add half of it again. 6.24 + 3.12 = 9.36.
• 18% — find 20% and subtract a tenth of that. 12.48 − 1.25 = 11.23.

Rounding up to a convenient number after that is normal and nobody will mind.

Worked examples

Dinner for two

The bill is 84.60 and you want to leave 20%. The tip is 0.20 × 84.60 = 16.92, giving a total of 101.52. Rounding the total up to 102 makes the tip 17.40, which is about 20.6% — a perfectly ordinary thing to do.

A group of five

The bill is 213.75 and the group agrees on 18%. The tip is 38.48, so the total is 252.23. Split five ways that is 50.45 each. Rounding each share up to 51 collects 255, which covers the bill and leaves the extra 2.77 as additional tip.

Checking a tip someone else added

A bill arrives showing 96.00 with a 17.28 gratuity already applied. Dividing 17.28 by 96.00 gives 0.18, so the service charge is 18%. That is the tip — there is no need to add more.

Quick reference

Tip at 15%, 18% and 20% of the bill, and the total to pay at 18%. Tip = bill × percentage ÷ 100.

Bill	15% tip	18% tip	20% tip	Total at 18%
20.00	3.00	3.60	4.00	23.60
40.00	6.00	7.20	8.00	47.20
60.00	9.00	10.80	12.00	70.80
80.00	12.00	14.40	16.00	94.40
100.00	15.00	18.00	20.00	118.00
120.00	18.00	21.60	24.00	141.60
150.00	22.50	27.00	30.00	177.00
200.00	30.00	36.00	40.00	236.00

What to tip, by situation

These are common United States guidelines. Customs vary considerably by country, and the section below covers that.

• Restaurant, table service — 15% to 20%, with 20% the usual default.
• Counter service and takeaway — nothing is expected; a small amount for a complex custom order is a kindness, not an obligation.
• Bar — roughly one unit of currency per drink, or 15% to 20% on a tab.
• Food delivery — 10% to 15%, with a small minimum on cheap orders, and more in bad weather.
• Taxi or ride share — 10% to 15%, more if the driver helps with luggage.
• Hairdresser or barber — 15% to 20%.
• Hotel housekeeping — a few units per night, left daily rather than at the end, since staff rotate.
• Large groups — check the bill first. Parties of six or more are frequently charged an automatic gratuity.

Tipping is not universal

Tipping norms differ sharply between countries, and applying American habits everywhere can be as awkward as not tipping at all.

In much of Europe, service is included by law or by convention, and rounding up the bill or leaving 5% to 10% for good service is generous rather than expected. In Japan and South Korea, tipping is not customary and can cause genuine confusion or even offence. In Australia and New Zealand, staff are paid a full minimum wage and tipping is occasional rather than routine.

The reason the United States is unusual is structural: in many states, tipped employees can be paid a reduced base wage on the assumption that tips will bring their earnings up to the standard minimum. That is why a low tip carries more weight there than it would elsewhere.

Splitting a bill fairly

Dividing the total equally is the simplest approach and works well when everyone ordered similarly. It works badly when one person had a starter, a main and three drinks while another had a salad and tap water.

For uneven tables, add up what each person actually ordered, then apply the same tip percentage to each subtotal. Everyone contributes proportionally, and the tip still comes out right overall.

If you are collecting cash, rounding each share up slightly is the practical move. The small surplus covers rounding losses and goes to the server.

Common mistakes

• Splitting first, then adding tips. Individually rounded tips rarely add up to the intended total. Add the tip, then divide.
• Tipping twice. Auto-gratuity on large parties is easy to miss, and the tip line printed underneath it catches people out constantly.
• Assuming a delivery fee is the tip. It usually goes to the restaurant or the platform, not the driver.
• Tipping on the tax when it is high. Harmless, but on a large bill in a high-tax area it adds up; tipping on the subtotal is entirely acceptable.
• Punishing the server for the kitchen. Slow or poor food is not usually the server’s doing. Speak to the manager instead.

Frequently asked questions

How do I calculate a 20% tip?

Move the decimal point one place left to get 10%, then double it. On a 47.50 bill, 10% is 4.75, so 20% is 9.50. This is the fastest mental method and it works on any bill.

Should I tip on the pre-tax or post-tax total?

Either is accepted, though tipping on the pre-tax subtotal is the more traditional approach. On most bills the difference is small, so many people simply tip on the total for speed. If the tax rate where you are is high, tipping pre-tax is a reasonable choice.

How much should I tip at a restaurant?

In the United States, 15% to 20% is the usual range for sit-down table service, with 20% treated as the default for satisfactory service and more for service that stood out. Counter service, takeaway and self-service generally carry no obligation to tip.

How do I split a bill with a tip between friends?

Add the tip to the bill first, then divide the total by the number of people. Dividing first and adding tips separately produces rounding differences that leave the total short. If the group ordered very unevenly, splitting by what each person ordered is fairer.

Do I still tip if a service charge is already on the bill?

Usually not. If the bill shows a service charge, gratuity or “auto-grat”, that is the tip. Adding another on top is optional and only worth doing for genuinely exceptional service. Always read the bill before tipping, particularly with larger groups where auto-gratuity is common.

Is it rude to tip less than 15%?

In the United States a tip well below 15% is usually read as a comment on the service, because tipped staff are often paid a lower base wage on the assumption that tips make up the difference. If the problem was the food rather than the server, raising it with the manager is more effective than reducing the tip.

How much should I tip for delivery?

A common guideline is 10% to 15% with a small minimum of a few units of currency for short, inexpensive orders. Bad weather, long distances and large orders all justify more. Note that a delivery fee charged by the restaurant or app usually does not reach the driver.

How do I work out the tip percentage from an amount I already paid?

Divide the tip by the pre-tip bill and multiply by 100. If you left 12 on a bill of 60, that is (12 / 60) x 100 = 20%. This is a useful check when someone else has already added a gratuity.