The tip formula
Calculating a tip starts with the bill amount and the tip percentage. The formula is the same as finding a percentage of a number.
Tip Amount = Bill x Tip Rate / 100
The total bill including tip is:
Total with Tip = Bill + Tip Amount
Or in one step:
Total with Tip = Bill x (1 + Tip Rate / 100)
Common tip percentages
In many countries, tipping is customary in restaurants and for personal services. Typical rates for table service:
- 15% -- standard for adequate service
- 18% -- good service
- 20% -- excellent service
For large parties (typically 6 or more), some restaurants add an automatic gratuity of 18% to 20%. Always check your bill before adding an extra tip.
Quick mental math shortcuts
Here are fast ways to estimate a tip without a calculator:
- 10%: Move the decimal point one place left. On $48.00, 10% is $4.80.
- 15%: Take 10%, then add half of that. $4.80 + $2.40 = $7.20.
- 18%: Take 20% (double the 10% amount), then subtract roughly one-tenth of that. $9.60 - $0.96 ≈ $8.64.
- 20%: Double the 10% amount. $4.80 x 2 = $9.60.
Step-by-step example: 20% tip on $54.50
- Calculate the tip: $54.50 x 20 / 100 = $54.50 x 0.20 = $10.90
- Add to the bill: $54.50 + $10.90 = $65.40
Total with a 20% tip is $65.40.
Splitting the bill
When dining with a group, the fair approach is to calculate the total including tip, then divide by the number of people.
Per Person = (Bill + Tip Amount) / Number of People
Or in one step:
Per Person = Bill x (1 + Tip Rate / 100) / Number of People
Example: dinner for four
The bill is $180 and you want to leave an 18% tip. The group has 4 people.
- Calculate tip: $180 x 0.18 = $32.40
- Total bill: $180 + $32.40 = $212.40
- Split four ways: $212.40 / 4 = $53.10
Each person pays $53.10.
Example: 15% tip, 3 people, $87 bill
Using the one-step formula:
Per person = 87 x (1 + 15 / 100) / 3 = 87 x 1.15 / 3 = 100.05 / 3 = $33.35
Each person pays $33.35.
Tipping on the pre-tax amount
Etiquette guides often recommend tipping on the pre-tax subtotal, not the tax-inclusive total. The reasoning is that tax is a government charge, not part of the service you received. On a $60 meal with 8% tax, the post-tax total is $64.80. A 20% tip on $64.80 is $12.96, while 20% on $60 is $12.00. The difference is small on one meal but adds up over time.
In practice, most people tip on the total shown on the bill. Either approach is acceptable; the important thing is to be consistent and fair.
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