Short answer: A tip is just a percentage of the bill. So 20% on an $80 bill is $16, making the total $96 — and split three ways, that is $5.33 tip and $32.00 total per person. This free calculator does all three steps at once: tip amount, total bill, and each person's share, with quick buttons for the usual tip rates (10%, 15%, 18%, 20%, 25%) or any custom percent you prefer.
Last updated: 31 October 2026 · Estimate only — not financial advice.
How the math works
- Tip amount = bill × tip percent ÷ 100. So 20% on $80 = 80 × 20 ÷ 100 = $16.
- Total bill = bill + tip. $80 + $16 = $96.
- Per person = total ÷ number of people, and tip per person = tip ÷ number of people. $96 ÷ 3 = $32.00 total each, $16 ÷ 3 = $5.33 tip each (rounded to cents; the last cent may differ by a penny when splitting — see the rounding note below).
- Rounding: results are rounded to two decimal places (cents). When a split does not divide evenly, each person's share is rounded to the nearest cent, so the rounded shares can be a cent above or below the exact total.
Worked example (illustrative — not a real bill, not advice)
Dinner for three. The bill is $60, you choose a 20% tip, and three people split it evenly. Tip = 60 × 20 ÷ 100 = $12. Total = 60 + 12 = $72. Per person: tip $12 ÷ 3 = $4, total $72 ÷ 3 = $24. Everyone pays $24 and the server gets $12.
Quick check without a calculator. 10% of any bill is just the bill moved one decimal place: 10% of $45 is $4.50, so 20% is double that, $9, and the total is $54. That is why the 10% button is the fastest mental shortcut — double it for 20%, add half again for 15% ($4.50 + $2.25 = $6.75 on a $45 bill).
How much should you tip? (customs, not rules)
There is no law fixing a tip percent, and customs differ by country. In the US, 15–20% is the usual range for sit-down restaurant service, with 20–25% for very good service; in much of Europe a service charge is often already included, and rounding up or leaving 5–10% is common. The calculator does not judge — enter whatever percent fits the place you are in, and check the bill first: if a service charge is already added, tipping again on top of it double-pays.
FAQ
Do I tip on the bill before or after tax?
The usual convention in the US is to tip on the pre-tax subtotal, not the tax-inclusive total. If your $50 meal shows $4 tax and a $54 total, a 20% tip on the subtotal is $10; on the total it would be $10.80. Either is accepted — the difference is small — but tipping on the subtotal is the standard most guides quote.
How do I split a bill fairly when people ordered different things?
For an even split, use the calculator as-is. For an uneven split, run it once per person on each person's own subtotal — the tip and total scale the same way. The one trap: if one person pays the whole bill and others pay them back, agree the tip percent before anyone pays, not after.
What if the bill already includes a service charge?
Check the receipt first. If a service charge (often 12.5–20%) is already added, that is the tip — adding another 20% on top means you tipped twice. In that case, enter 0% here or leave a small extra only if the service was exceptional.
Why does my split total differ by a cent?
Because cents cannot be divided evenly: $16 ÷ 3 = $5.333… per person, which rounds to $5.33, and 3 × $5.33 = $15.99, one cent short of $16. In practice one person covers the extra cent. The calculator rounds each person's share to the nearest cent and notes this so the penny gap never looks like an error.
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Sources
- IRS — Tip recordkeeping and reporting (how tips are treated in the US)
- Consumer Financial Protection Bureau — What is a service charge?
- Khan Academy — Percent problems (the percentage math behind tipping)
Disclaimer: This tool is for education only. It is not financial advice. Tip customs vary by country and venue — always check your receipt for an included service charge before tipping again.
— Adrian Cole, Bia Crypto
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