Tip Calculator — Split Bill Easily
Calculate tip amounts and split the bill fairly. Handles rounding and explains why splitting doesn't always divide evenly.
Tip Calculator
Tip etiquette + math
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The easy half
Three inputs: the bill, the tip percentage, and how many people are splitting. On a bill of 100 at 15%, the tip is 15.00 and the total is 115.00. A percentage of the bill, added to the bill — nothing subtle.
Splitting is a rounding problem
Take a bill of 87.40 at 18%. The tip is 15.73 and the total is 103.13. Split three ways, each person pays 34.38.
Three payments of 34.38 come to 103.14 — one cent more than the bill.
That is not a fault in the arithmetic. 103.13 divided by three is 34.3766…, and nobody can hand over a fraction of a cent. Rounding each share to something actually payable has to overshoot or undershoot, and the spare or missing cent is structural rather than an error to hunt for.
What to do about it
Two reasonable resolutions.
One person absorbs it. Someone pays a cent more or less than everybody else, and nobody notices or cares.
Round the total up first. This is the cleaner move, because it removes the problem instead of distributing it. On 103.13 split three ways, rounding to 105.00 gives exactly 35.00 each — a figure everyone can pay without anyone doing arithmetic. The extra goes to the tip, which is usually the intention anyway.
Note that rounding up only helps if you round to a total that actually divides. 103.15 does not divide by three any more cleanly than 103.13 does.
Check the bill before you tip
Tipping customs differ enormously between countries and settings. In some places a service charge is added by the venue and a further tip is unusual; in others a tip is expected. This applies whatever percentage you enter rather than assuming a norm, which is the right behaviour for a tool used from many countries.
Before adding anything, look for a service charge already on the bill. Tipping on top of an included charge is the commonest way people pay twice, and it is easy to miss because the line is often near the bottom in small print.
The percentage scales with the bill, not the service
Worth being conscious of: a percentage of a larger bill is a larger tip for identical service. A table that ordered an expensive bottle generates a much bigger tip at the same percentage than one that did not, though the work involved was the same.
That is not an argument for tipping less — just a reason the same percentage does not mean the same thing on every bill, and why some people adjust the figure rather than applying one number to everything.
Everything runs in your browser and nothing is uploaded. For the same percentage arithmetic in the other direction, see the discount calculator.
How to use the Tip Calculator
Takes about a minute. No signup, no download, your data stays in your browser.
- 1Open the tool. Scroll up to the Tip Calculator above — it loads instantly in your browser, no install needed.
- 2Enter your values. The fields come pre-filled with realistic defaults so you can see how it works — replace them with your own numbers.
- 3Read the result. The output updates instantly. Copy or share it — nothing is uploaded to a server, everything stays on your device.
Frequently asked questions
Common questions about the Tip Calculator.
Why do the split amounts not add up to the total?
Because the total rarely divides exactly by the number of people. 103.13 split three ways is 34.3766 each, and nobody can pay a fraction of a cent, so each share is rounded to something payable — three payments of 34.38 come to 103.14, a cent over. The gap is structural rather than a calculation error.
What is the tidiest way to split a bill?
Round the total up to a figure that divides evenly before splitting. On 103.13 among three people, going to 105.00 gives exactly 35.00 each and the extra goes to the tip. Just make sure the rounded total actually divides — 103.15 is no better than 103.13 for three people.
Should I tip if there is already a service charge?
Check the bill first, because tipping on top of an included service charge is the commonest way people pay twice, and the line is often in small print near the bottom. Whether to add anything on top is a judgement that varies by country and venue, and this tool applies whatever figure you give it rather than assuming.
What tip percentage should I use?
There is no universal answer and this deliberately does not suggest one — customs differ enormously between countries, and in some a tip is unusual while in others it is expected. Enter the figure that fits where you are. The default is a starting point rather than a recommendation.
Why does the tip get bigger when the bill does?
Because a percentage scales with the amount, not with the service. A table that ordered an expensive bottle produces a much larger tip at the same percentage than one that did not, for the same work. Some people adjust the percentage on unusually large bills for exactly that reason.
Is my bill amount uploaded?
No, the calculation runs entirely in your browser and nothing is sent to a server. Nothing is stored either, so refreshing the page clears it.
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