To calculate a tip, multiply the bill by the tip percentage and divide by 100. A 15% tip on 80 is 80 × 15 ÷ 100 = 12, so the total is 92. To split it, divide the total by the number of people: 92 ÷ 2 = 46 each.
Formulas
tip = bill × % ÷ 100total = bill + tip Examples
- 18% on 64.50: 64.50 × 0.18 = 11.61, total 76.11.
- 20% on 150 split four ways: tip 30, total 180, 45 each.
Common mistakes
- Tipping on the amount after tax when you meant the amount before tax. Enter the figure you want to tip on.
- Rounding every share down, so the group comes up short.
In Excel and Google Sheets
- Bill in A2, tip % in B2
=A2*B2 - Total per person, people in C2
=A2*(1+B2)/C2
FAQ
How do I calculate a 20% tip quickly?
Move the decimal point one place left to get 10%, then double it. For 45: 4.50 × 2 = 9.
How do I calculate a 15% tip?
Take 10%, then add half of it. For 60: 6 + 3 = 9.
How much should I tip?
Customs differ by country and by service. Enter the percentage that’s usual where you are.
How we calculate: exact decimal math (no rounding errors), you choose the decimal places, and your numbers never leave your browser. Methodology →
Updated October 2026