How to Calculate a Tip (Fast, in Your Head)
Published June 7, 2026
Tipping does not require a calculator at the table. A few quick mental tricks get you to a fair number every time, no phone needed.
- Standard US sit-down service: 18-20%. Fifteen percent is the old floor; most people have moved up.
- The fastest mental shortcut: find 10%, then add half of that to get 15%, or double 10% to get 20%.
- Tip on the pre-tax total when you want to be precise. Tipping on the full bill is fine and rarely makes a big difference.
- For a split check, figure the tip on the full bill first, then divide. Splitting the tip separately leads to under-tipping.
The standard percentages
Before you can calculate a tip, you need a target. US tipping norms have shifted upward over the past two decades. Here is where things stand for restaurant service:
Twenty percent has become the de facto standard at full-service restaurants because the math is easy and servers depend on tips as a large portion of their income. When service was outstanding, rounding up to 25% is a meaningful gesture.
The fast mental-math method
You do not need to multiply in your head. One rule covers almost every situation.
Drop the last digit (or move the decimal one place left). A $48 bill: 10% is $4.80.
Double your 10% number. $4.80 x 2 = $9.60. Round to $10 and move on.
Take your 10% number and add half of it. $4.80 + $2.40 = $7.20.
Add 10% + half of 10% + a small nudge. Or just split the difference between your 15% and 20% numbers. ($7.20 + $9.60) / 2 = $8.40.
Bill is $63.00. Ten percent is $6.30. Double it for 20%: $12.60. Round up to $13 if the service was great. That is the whole calculation.
Tip amounts on a sample bill
To make the percentages concrete, here is what a $60 bill looks like at each tier:
Notice the spread between 15% and 20% on a $60 tab is just $3. For you, that is the price of a coffee. For your server, it is the difference between a poor and a fair tip on the table.
Pre-tax vs. the full bill
The polite debate: should you tip on the food total before tax, or on the after-tax total?
Technically correct. The server did not bring you the tax. On a $60 bill with 8% tax, you tip on $60, not $64.80.
Saves you about $0.50-$1 on a typical dinner.
Simpler, more common, and friendlier. Most people tip on whatever number is at the bottom of the check.
The difference is small. Rounding up a dollar covers it either way.
In practice, tipping on the full bill is fine. The math is easier and the difference on a typical restaurant bill is under a dollar. If you want the exact pre-tax number, use the Sales Tax Calculator to back it out.
Splitting the bill
Splitting with a group is where tipping goes sideways most often. The order of operations matters.
Calculate the tip on the full table total first, then split everything. Do not let each person calculate their own tip independently. When everyone rounds down slightly, the server ends up with a tip well below what any individual intended.
For example: four people, $120 total bill. A 20% tip is $24, so each person owes $36. If each person instead tips 20% on their $30 share and rounds to $5, the server gets $20, a real shortfall.
For uneven splits, the Tip Calculator handles the arithmetic automatically.
What to tip by service type
Not every service follows restaurant rules. Here is a quick reference:
18-20% standard. 15% for poor service. 25%+ for outstanding.
Tip on every visit, regardless of bill size.
10-15% is generous. Zero is acceptable for straight counter pickup. Tip more if they made something custom or delivered it curbside.
Optional, but appreciated.
15-20% of the order total, with a $3-5 minimum on small orders. Drivers use their own vehicle and pay for gas.
Tip before delivery, not after.
$1-2 per drink for simple orders. 15-20% on a tab. More for complex cocktails or if they remember your order.
Tip as you go if you are running a tab.
15-20% is standard. Tip in cash when you can; it goes directly to the stylist.
Include the shampoo assistant if there is one ($3-5).
Housekeeping $2-5 per night, left daily. Bellhop $1-2 per bag. Valet $2-5 when you retrieve your car.
Bring small bills for these.