How to Calculate a Restaurant Tip

Q: What is the standard tip percentage in the US?

15% is considered the minimum for adequate service. 18% is standard for good service. 20% or more is appropriate for excellent service. For delivery, 10-15% or a $3-5 minimum is typical.

Q: Should I tip on the pre-tax or post-tax amount?

Tipping on the pre-tax amount is technically correct, but most people tip on the total bill for simplicity. The difference is small and either approach is acceptable.

Q: How do I calculate a 20% tip quickly in my head?

Move the decimal one place left to get 10%, then double it. Example: on a $48 bill, 10% is $4.80, doubled is $9.60. Round up to $10 for simplicity.

Q: When is it acceptable not to tip?

In the US, tipping is expected at full-service restaurants, bars, hair salons, taxis, and food delivery. Counter service and fast food generally do not require a tip, though a small amount is appreciated.

Calculating a tip is a simple percentage problem. Once you know the formula and a few mental math shortcuts, you will never need to fumble with your phone at the table again.

The tip formula

A tip is calculated as a percentage of your bill. Multiply the bill amount by the tip percentage divided by 100.

Tip = Bill x (Tip % / 100)

Example: A $65 bill with a 20% tip. $65 x (20 / 100) = $65 x 0.20 = $13.00 tip. Total = $65 + $13 = $78.00.

In the US, the standard range is 15-20% for sit-down restaurants. For exceptional service, 20-25% is a great way to show appreciation. For delivery, 10-15% or a minimum of $3-5 is typical.

Mental math shortcuts

You do not need a calculator to estimate a tip. Use these shortcuts for common tip percentages.

To find 10%: Move the decimal point one place to the left. On a $47 bill, 10% is $4.70.

To find 20%: Find 10% and double it. On a $47 bill, 20% is $4.70 x 2 = $9.40.

To find 15%: Find 10%, then add half of that. On a $47 bill, 15% is $4.70 + $2.35 = $7.05.

To find 18%: Find 20% then subtract 10% of that. On a $47 bill, 20% is $9.40, minus $0.94 = about $8.46.

Tip quick-reference table

Common restaurant bill amounts with 15%, 18%, and 20% tips already calculated -- no math required.

Bill	15% Tip	18% Tip	20% Tip
$20	$3.00	$3.60	$4.00
$30	$4.50	$5.40	$6.00
$40	$6.00	$7.20	$8.00
$50	$7.50	$9.00	$10.00
$60	$9.00	$10.80	$12.00
$75	$11.25	$13.50	$15.00
$80	$12.00	$14.40	$16.00
$100	$15.00	$18.00	$20.00
$120	$18.00	$21.60	$24.00
$150	$22.50	$27.00	$30.00
$200	$30.00	$36.00	$40.00