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Calculation details
Planning estimate only, not financial, tax, or legal advice. Verify assumptions and current rules before making decisions.
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Use this result
Share the current inputs or ask ChatGPT to explain the calculation in context.
What does this calculator estimate?
A tip and bill split calculator works out each person's share. Enter the subtotal, tax, tip, and number of people.
- Share = (subtotal + tax) × (1 + tip) ÷ people
- $108 × 1.2 ÷ 4 = $32.40 each
- Tip on pre-tax or post-tax — your choice
How bill splitting works
The calculator adds tax and tip to the subtotal, then divides by the number of people. The main choice is whether the tip is calculated on the pre-tax amount (the US norm) or the taxed total — the tool supports both.
Limitations to watch for
Customs vary: in the US, tips of 15–20% are expected; in many other countries service is included. The tool assumes an equal split — for itemized shares, each person's own items must be totaled separately.
How to use it in practice
Enter the pre-tax bill, your tax rate, the tip you want, and the headcount. Decide whether to tip on the pre-tax total (standard) — the tool shows both. Round each share for cash payments.
- Enter the subtotal and tax.
- Enter the tip % and the number of people.
- Read the per-person total.
How tip and split are calculated
Each person's share = (subtotal + tax + tip) ÷ people. A $100 bill, 8 percent tax, 20 percent tip, split 4 ways: (100 + 8) × 1.2 ÷ 4 = $32.40 each. The calculator runs the split from any bill.
Tip percentages
15 percent is standard, 18–20 percent for good service, and 25 percent for exceptional — the calculator accepts any rate and shows the tip and total.
Rounding and fairness
Rounding each person's share up covers the difference; rounding down leaves the payer short. The calculator shows exact shares so the group can agree on rounding.
A worked example
A $76.40 bill with 9 percent tax and 18 percent tip split three ways: tax $6.88, tip $14.99, total $98.27 — $32.76 each. The calculator returns the per-person amount.
Split items vs. equal split
When people order different amounts, equal splitting subsidizes the expensive orders. The calculator handles equal splits; itemized splitting is a per-line exercise.
How this calculator works
Formula
Per person = (subtotal + tax) × (1 + tip %) ÷ people, optionally rounding each share. The tool supports tipping on subtotal or on subtotal + tax.
Worked example
$100 subtotal, 8% tax, 20% tip, split 4 ways: ($108 × 1.20) ÷ 4 = $32.40 each.
Assumptions to verify
- The bill is split equally.
- Tip and tax are entered as percentages.
- The US tipping norm applies unless stated.
Frequently asked questions
How do I split a bill with tip?
(Subtotal + tax) × (1 + tip%) ÷ people: $108 × 1.2 ÷ 4 = $32.40 each.
Should I tip on pre-tax or post-tax?
US convention is pre-tax; tipping on the taxed total is more generous. The tool shows both.
What tip percentage is standard?
15–20% in the US; many countries include service in the bill.
How do I handle uneven splits?
This tool splits equally — total each person's items separately for uneven shares.
How do I round shares?
Round each share to the nearest dollar or quarter — the tool offers rounding modes.
Who pays the tax?
Everyone equally in an equal split — the calculator includes it.
Is 20% tip on tax double-dipping?
Arguably — that's why the tool lets you tip on the pre-tax subtotal.
Should I tip on the pre-tax amount?
Convention varies; tipping on the subtotal is common and fair.
How do I handle rounding?
Agree up front — rounding each share up covers the difference.
Cite this tool
BoringToolsKit. “Tip & Bill Split Calculator.” boringtoolskit.com/tip-bill-split-calculator/ (reviewed 2026-08-25). Free to reference in articles, syllabi, and answer posts with a link.
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