Calculating a tip quickly — without a calculator — is a useful skill. This guide covers mental math methods, standard tip amounts, and how to split the bill.
Standard Tip Percentages
| Service Quality | Tip |
|---|---|
| Exceptional | 25–30% |
| Good | 20% |
| Acceptable | 15% |
| Poor | 10% or none |
| Takeout/counter | 10–15% (optional) |
The Quick 20% Method
- Move the decimal one place left to get 10%
- Double it to get 20%
Example: Bill is $47.50
- 10% = $4.75
- 20% = $4.75 × 2 = $9.50
The 15% Method
- Find 10% (move decimal left)
- Find 5% (half of 10%)
- Add them together
Example: Bill is $60
- 10% = $6.00
- 5% = $3.00
- 15% = $6.00 + $3.00 = $9.00
Pre-Tax vs. Post-Tax Tipping
Tip on the pre-tax amount when possible — you're rewarding service, not paying tax on your tip. However, in practice most people tip on the total bill shown and the difference is small.
Splitting the Bill
To split evenly:
Per person = (Bill + Tip) / Number of people
Example: $120 bill, 20% tip, 4 people:
Tip = $120 × 0.20 = $24
Total = $120 + $24 = $144
Per person = $144 / 4 = $36
Tip Etiquette by Country
Tipping customs vary significantly:
- USA/Canada: Expected, 18–22% standard
- UK: 10–12.5% if not already included
- Australia: Not expected, rounding up is fine
- Japan: Considered rude in many settings
- Sweden: Optional, 10% for good service
- France: Small tip appreciated, not obligatory
Always check if a service charge is already included in your bill before adding more.
Tax-Based Quick Tip
In the US, if you know your tax rate, you can tip based on the tax line on your receipt. Double the tax for ~15–18%, triple it for ~22–27% (depending on your local tax rate).
Use our Tip Calculator to calculate tips, split bills among any number of people, and handle unequal splits.