ReckonBoxWhat a tip calculator works out
A tip calculator takes your bill, a tip percentage, and the size of your group, and returns the gratuity, the new total, and each person's share. An 18% tip on a $50 bill is $9.00, for a $59.00 total.
The percentage is the part people actually debate. In the US, sit-down table service runs 15% to 20%, and 18% sits in the middle as a safe default. A 2025 Bankrate survey of 2,445 US adults found 70% always tip their server at a sit-down restaurant, and 35% typically tip at least 20%. Counter service, buffets, and takeout carry a lower expectation or none, so treat the 15% to 20% band as the floor for full service.
Pre-tax subtotal or the tax-inclusive total?
The common US convention is to tip on the pre-tax subtotal, since sales tax is money the government collects, not service the server provided. Tipping on the tax-inclusive total is also fine and a touch more generous.
The gap is small but real, and it only appears when tax is on the check. Take a $50 subtotal with $4 of tax. Tip 18% on the $50 subtotal and the tip is $9.00. Tip 18% on the $54 total instead and it becomes $9.72, a difference of 72 cents. Most calculators pick one basis silently. This one gives you the choice and shows what switching costs, so the number is never hidden. The pre-tax subtotal is the default; enter a tax amount and flip the basis to see the total-based figure.
Splitting the check
To split evenly, add the tip to the bill and divide the total by the number of people, which spreads the meal and the gratuity together. Four people on a $120 bill at 20% pay a $24 tip and $144 total, so $36 each. Enter the group size and the tool shows the total per person and the tip per person side by side.
An even split assumes everyone ate about the same. When one person ordered a steak and another had a salad, a fairer approach is to tip as a single group percentage on the whole bill, then have each person cover their own items plus that same percentage. The group tip stays correct while each share tracks what was actually ordered.
A quick mental estimate
Finding 10% is the anchor: move the decimal one place left, so $50 becomes $5. Double it for 20%, which is $10. For 15%, add half of the 10% figure, giving $7.50. An 18% tip is 20% with a little shaved off. These shortcuts land within a few cents, close enough to leave in cash, and the calculator gives the exact figure when you want it.
What this does not decide for you
This tool does the arithmetic. It does not tell you what a given service was worth, which is a judgment only you can make at the table. Tipping norms are also local: much of Europe folds service into the price or expects only small rounding, and in Japan a tip can read as rude. The percentages built into this tool are American, so treat them as US conventions and check local custom when you travel.
Leave the exact cents in and round the total up to the next dollar if you like round numbers, because a $59.00 total rounded to $60 is a 20% tip that needs no second thought.
Frequently asked questions
How much should I tip at a restaurant? In the US, 15% to 20% of the bill is the standard range for sit-down table service, with 18% a common middle. A 2025 Bankrate survey found 70% of Americans always tip their server at sit-down restaurants and 35% typically tip at least 20%. Counter service, buffets, and takeout carry lower or no expectation, so the percentage is a floor for full service, not a universal rule.
Do you tip on the pre-tax or post-tax amount? The common US convention is to tip on the pre-tax subtotal, since tax is money the government takes, not service the server gave. Tipping on the tax-inclusive total is also fine and slightly more generous. On a $50 subtotal with $4 tax, an 18% tip is $9.00 on the subtotal or $9.72 on the total, a 72 cent difference. This calculator lets you pick the basis so the number is not hidden.
How do I split a tip between people? Add the tip to the bill, then divide the total by the number of people, which spreads both the meal and the gratuity evenly. Enter the group size here and the tool shows the total per person and the tip per person. For an uneven split where people ordered very differently, tip as a group percentage first, then divide each person share of the pre-tip bill and add the same percentage on top.
What is a quick way to work out a tip in my head? Find 10% by moving the decimal one place left, so $50 becomes $5. Double it for 20% ($10), or add half of the 10% for 15% ($7.50). For 18%, take 20% and shave a little off. These shortcuts get you within a few cents, which is close enough for a tip, and the calculator gives the exact figure and the per-person split.
Is tipping expected everywhere? No, tipping norms are local. The US leans heavily on tips because tipped wages can be lower, so gratuities make up real income. Much of Europe includes service or expects only small rounding, and in Japan tipping can read as rude. This tool uses US conventions, so treat the percentages as American and check local custom when you travel.