The Tip Formula
Tip Amount = Bill Total × (Tip % ÷ 100)
Total with Tip = Bill Total × (1 + Tip % ÷ 100)
Quick Tip Reference Table
| Bill Amount | 15% Tip | 18% Tip | 20% Tip | 25% Tip |
|---|---|---|---|---|
| $20 | $3.00 | $3.60 | $4.00 | $5.00 |
| $35 | $5.25 | $6.30 | $7.00 | $8.75 |
| $50 | $7.50 | $9.00 | $10.00 | $12.50 |
| $75 | $11.25 | $13.50 | $15.00 | $18.75 |
| $100 | $15.00 | $18.00 | $20.00 | $25.00 |
| $150 | $22.50 | $27.00 | $30.00 | $37.50 |
| $200 | $30.00 | $36.00 | $40.00 | $50.00 |
Frequently Asked Questions
How do you calculate a 20% tip?
Move the decimal one place left to get 10%, then double it. On a $47 bill: 10% = $4.70, doubled = $9.40 tip. Or multiply $47 × 0.20 = $9.40.
What is the standard tip percentage?
15–20% is standard for sit-down restaurants in the US. 20% is now considered the baseline for good service. 25%+ for exceptional service. Takeout: 10–15%. Delivery: 15–20% (minimum $3–5).
Should you tip on the pre-tax or post-tax amount?
Etiquette experts say tip on the pre-tax amount, but in practice most people tip on the total bill. The difference is small — on a $50 pre-tax bill with 8% tax, tipping on $54 vs $50 is only $0.80 difference at 20%.
How do you split a bill with tip?
Add the tip to the total first, then divide. Bill: $120, 20% tip = $24, total = $144. Split 4 ways = $36 each. Alternatively, each person pays their share plus 20% tip on their portion.
Do you tip on alcohol?
Yes. Tip on the full bill including alcohol. Bartenders typically receive 15–20% per drink ($1–2 minimum per drink). Some people tip separately on alcohol vs food, but tipping on the full total is standard.