Tip Calculator

One multiplication, one division, and the order between them does not matter

A tip is a percentage of the bill and a split is a division, so the whole calculation is two operations: multiply the bill by the rate, add the result to the bill, divide by the number of people.

The case this page opens with is a $75 restaurant bill, an 18% tip, three people. The tip is 75 × 0.18 = $13.50, the total is 75 + 13.50 = $88.50, and each person pays 88.50 ÷ 3 = $29.50, of which $4.50 is their share of the gratuity.

Run it in the other order and nothing changes. Split first — 75 ÷ 3 = $25 each — then tip your own share: 25 × 0.18 = $4.50, for a $29.50 total. Identical to the cent, because a rate and a headcount commute, so nobody has to wait for the check to be totalled to know what they owe. Only rounding partway through breaks the equivalence: if all three round a $4.50 contribution up to $5, the table leaves $15 on a $75 bill, which is a 20% tip rather than the 18% everyone thought they were leaving.

Ten percent is a decimal point, and every other tip is one step from it

The point of showing the arithmetic is that you can leave the page behind at the table. Ten percent of any bill is that bill with the decimal point moved one place left: on a $75 check, $7.50. Every preset on this calculator is a short step from there.

Double it for 20%: $15. Add half of it for 15%: $7.50 + $3.75 = $11.25. For 18%, start at 20% and subtract a fifth of the 10% figure — $7.50 ÷ 5 = $1.50, so $15 − $1.50 = $13.50, the number the tool returns. For 25%, add half of the 10% figure to the 20% one: $15 + $3.75 = $18.75.

Rounding is the last step, and there are two places to do it. Round the tip and $13.50 becomes $14, making the check $89. Round the grand total and $88.50 becomes $90 — which quietly makes the tip $15, because 90 − 75 = 15, and $15 is 20% of the bill. Both are fair gratuities; rounding the total is the one that is easier to remember and the more expensive of the two.

The 15–20% band is a convention, and no authority issues it

In the United States, 15–20% is the standard band for sit-down restaurant service. Twenty percent is widely treated as the baseline for service that was simply fine, 25% or more is for something exceptional, and takeout sits lower: optional, with 10–15% appreciated rather than expected. A hairstylist, a taxi ride, and a food delivery all sit in the same 15–20% band.

Notice what that paragraph cannot do, which is cite anything. No standards body issues a gratuity percentage, and there is no document this page could link to that would settle an argument at the table. The arithmetic has authority behind it — a percentage of a number is elementary mathematics, and every formula is shown above — but the percentage you choose does not, which is why the presets here are offered as ranges and called conventions rather than rules.

It also means the norm is local. A tip is a social expectation, not a legal charge, and it varies by country and by service type. Where service staff are paid a full wage, the 20% that reads as ordinary in a US restaurant reads as extravagant. This calculator will compute 20% of any bill in any currency without complaint; it has no idea whether 20% is the right number where you are sitting.

Tipping on the total rather than the subtotal costs the tip rate applied to the tax

The tool multiplies whatever bill figure you type by your percentage. There is no tax field, so the pre-tax question is yours to settle before you type: enter the subtotal to tip on the food, or enter the grand total to tip on food plus tax.

Convention is genuinely split. Most etiquette guides put the tip on the pre-tax subtotal, on the reasoning that the tax was collected by a government rather than earned by a server, and that is the practice this page assumes you are following. Tipping on the post-tax total is a common and generous practice, and nobody treats it as an error.

The disagreement is easy to bound, because the gap between the two conventions is exactly your tip percentage applied to the tax alone. At 20%, every dollar of tax on the check adds twenty cents to the tip; at 15%, fifteen cents. Where tax is a small slice of the bill, the two answers land within a rounding step of each other and the choice matters less than the time spent arguing about it. On a large check in a high-tax jurisdiction it deserves a deliberate decision — one the tool cannot make for you, because it never sees your tax rate.

An even split overcharges whoever ordered least

The per-person figure here is an even split: the grand total divided by heads, everyone paying the same. That is the right answer when the table ordered comparably, and the wrong one the moment somebody had a salad while the rest had steak.

Put numbers on it. On the same $75 bill at 18%, three people pay $29.50 each. Say one of them ordered $15 of that $75, a fifth of the check. Their honest share of the $13.50 tip is 15 ÷ 75 of it, or $2.70, so their honest total is $17.70. The even split asks them for $29.50 instead — $11.80 more than they consumed, handed to the other two.

The fix follows from the same arithmetic. Total each person’s own items, divide that by the full bill to get their share, and apply that share to the tip; or, more simply, run each person’s subtotal through this calculator at the same tip percentage with the party size set to one. The parts add back up to the grand total, because the rate is identical for everyone and only the base changes. What it does not do is that bookkeeping for you: there is a single bill field, so an uneven split means one pass per person.

A service charge already printed on the check is the tip

Read the bottom of the bill before you type anything. Large parties, resorts, and many restaurants outside the US add a service charge or auto-gratuity as a line item, usually stated as a percentage of the same subtotal you were about to tip on. That line is the gratuity; adding your own percentage on top of it does not top it up, it doubles it.

The size of the error matches the tip itself. On the $75 bill above, an 18% service charge already printed on the check is $13.50, and running the bill through here at 18% adds another $13.50 — $27 of gratuity on a $75 meal, a 36% tip paid by accident.

There is a subtler version of the same mistake: some checks fold the service charge into the balance due, so typing that balance in applies your percentage to a figure that already contains a tip. Use the food-and-drink subtotal as the bill amount and treat the printed charge as gratuity already paid. If the service deserves more than that, add a dollar amount rather than a second percentage. The calculator sees one number and multiplies it, which is the whole design; checking whether that number already includes a tip is the step that has to happen at the table.

Housekeeping and bar tabs run on flat amounts, not percentages

A percentage of a bill is the wrong shape for some tipping situations, and this tool is built entirely around that shape. Where the convention is a fixed amount, there is no bill to take a percentage of. Hotel housekeeping is the clearest case: the convention is $2–5 per night, an amount unrelated to the room rate, so multiply it by nights yourself instead of reaching for a percentage.

Bartenders sit on the boundary, where the two conventions — $1–2 per drink, or 15–20% of the tab — agree only over a narrow band of prices. A dollar is 20% of a $5 drink, and two dollars is 15% of a $13.33 one, so between roughly $5 and $13 a drink the two rules give much the same answer. Below that range the flat dollar is the more generous of the two; above it, running the whole tab through this calculator at 18% or 20% is.

That is a real limitation rather than an oversight, and it is worth saying plainly what it cannot do: apply a per-night or per-drink convention, notice a mandatory service charge on your bill, split a check unevenly, or tell you what the local norm is. It multiplies a bill by a percentage and divides the result by a headcount, exactly and instantly. Everything else is a judgement you make before you type.

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