Three numbers come up in almost every tipping conversation: 15, 18, and 20 percent. They are not interchangeable. Each carries a different implied message to the person receiving it, and that message has shifted over the past decade as restaurant economics have changed. Worth knowing before you punch the number into a tip calculator.
What 15 Percent Means Now
Fifteen percent used to be the standard. Emily Post cited it as the baseline for restaurant tipping through most of the twentieth century. Today it reads as below-average at a full-service restaurant. Not offensive, but a signal that something fell short.
That is not unfair. In cities where the tipped minimum wage sits well below $10 an hour (the federal tipped minimum is $2.13, though most states set it higher), servers depend on tips to reach a living wage. At 15 percent, a server bringing in $600 of sales in a shift earns $90 in tips. At 20 percent on the same sales, they earn $120. The $30 difference is real money.
Where 15 percent still makes sense: counter service where a tip jar exists but no table service is involved, buffet restaurants where servers only bring drinks and clear plates, or any situation where service was genuinely poor and you want to leave something rather than nothing.
What 18 Percent Means
Eighteen percent has historically appeared on the credit card slip as the low default suggestion on receipts, slightly below the 20-percent suggestion printed beside it. It splits the difference. Servers know that 18 percent from a large table usually means the guests clicked the suggested amount without thinking, rather than making a deliberate choice.
It is a reasonable tip for service that was correct but unmemorable. Your water got refilled. The food arrived in a reasonable order. Nothing went wrong, and nothing stood out. That is 18 percent territory.
Some guides recommend 18 percent for large groups, since many restaurants add an automatic gratuity of 18 to 20 percent for parties of six or more anyway. If you see "gratuity included" on the bill, no additional tip is expected (though you can leave one for genuinely exceptional service).
What 20 Percent Means
Twenty percent is the current informal standard for full-service restaurant dining in the United States. It is what you tip when service was good, the server was attentive, and everything worked the way it should. Not extraordinary. Just good.
The math is easy. Take 10 percent of the bill, double it. On a $75 bill: $7.50 doubled is $15.00. Done.
Twenty percent also has a cushion built in. Servers share tips with bussers, food runners, and bartenders, a practice called tip-out. The amounts vary by restaurant, but a common split leaves the server keeping 65 to 75 percent of the tip. On a 20-percent tip, the server nets closer to 13 to 15 percent of the bill after tip-out. This is why "20 percent for good service" has replaced "15 percent for good service" as the standard over time.
When to Go Higher: 25 Percent and Beyond
Twenty-five percent is for service that genuinely made the meal better. A server who steered you away from the dish that was wrong for you, remembered a dietary restriction without being reminded, or managed a complicated table with actual grace. The gesture is not just generosity; it tends to be remembered at places you return to.
At high-end restaurants where the bill runs several hundred dollars, some diners cap the tip at a flat dollar amount rather than a strict percentage. A $400 bill at 20 percent is an $80 tip, which is already a strong tip. There is no obligation to exceed it, and most servers would agree.
Quick Reference: Tip Amounts by Bill Size
Rounded to cents for accuracy, not to the nearest dollar, so you can use these as exact targets.
| Bill Total | 15% | 18% | 20% | 25% |
|---|---|---|---|---|
| $30 | $4.50 | $5.40 | $6.00 | $7.50 |
| $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 |
These figures are based on the pre-tax bill total. See the FAQ below for the subtotal vs. total debate, which is less dramatic than it sounds.
How to Calculate a 15 Percent Tip Without Your Phone
The quickest method: find 10 percent (move the decimal left one place), then add half that number.
On a $46 bill, 10 percent is $4.60. Half of $4.60 is $2.30. Add them together: $6.90. That is 15 percent, rounded to $7.00 if you are paying cash.
For 20 percent, find 10 percent and double it. For 18 percent, find 10 percent, find 8 percent (roughly four-fifths of the 10-percent figure), and add them. In practice, most people round to the nearest dollar or five dollars and call it close enough.
Related Reading
If you want to go deeper on when tipping is expected and when it is genuinely optional, see our guide on how much you should tip across different service types. For the broader social context of American tipping norms, including airport, hotel, and rideshare situations, the tipping etiquette guide for the United States covers the full picture.
Frequently Asked Questions
Is 20 percent a good tip?
Yes, and it is the current standard at full-service restaurants in the United States. Twenty percent reflects competent, attentive service, and it accounts for the fact that servers typically share tips with other staff. Leaving 20 percent for good service is neither over-the-top nor stingy. Leave more when something genuinely stood out; 15 to 18 percent when service was below average but not a disaster.
How do you calculate a 15 percent tip?
Find 10 percent of the bill by moving the decimal point one place to the left, then add half that amount. On a $60 bill: 10 percent is $6.00, half is $3.00, and the tip is $9.00. That is 15 percent. No app required, though the tip calculator handles the split and rounding if you have a complicated check.
How much do you tip for a $100 bill?
At 15 percent, the tip is $15.00. At 18 percent, it is $18.00. At 20 percent, it is $20.00. At 25 percent, it is $25.00. The math on a $100 bill is easy because the numbers just become the tip dollar amount directly. Every other bill size is harder, which is why the reference table above exists.
Do you tip on the total or subtotal?
Most etiquette guides say the pre-tax subtotal, on the logic that tax is a government charge and has nothing to do with the quality of service. In practice, the difference is small. On a $60 pre-tax bill in a state with 7 percent sales tax, the taxed total is $64.20. Twenty percent of the subtotal is $12.00; 20 percent of the total is $12.84. The $0.84 difference is not worth agonizing over if you are already estimating. Tip on whichever number is easier to see on the receipt.