Question 1

Should I tip before or after tax?

Accepted Answer

Here is the honest answer: it barely matters on a typical dinner bill, but the default in the US is to tip on the post-tax total — meaning the number at the bottom of the receipt before you write anything in. On a $50 meal with 8% tax, tipping 20% on the pre-tax subtotal gives you $10 while tipping on the post-tax $54 gives you $10.80. The difference is 80 cents. Servers are not tracking this math per table, and neither should you. The calculator defaults to post-tax (the standard practice), but the pre-tax toggle is there for anyone who wants the technically correct interpretation of what a tip is supposed to represent.

Question 2

What is the standard tip percentage at a US restaurant?

Accepted Answer

The range that restaurant staff actually expect is 18% to 20% for competent service, with 15% being the floor for service that was adequate but nothing more. The 20% default in this calculator reflects where the American norm has settled over the past decade — what used to be exceptional is now baseline. Tipping below 15% sends a message; tipping at 25% or above sends a different one. The tip buttons include 10% because that is the right number for counter service and takeout where no table service happened, not as a punishment for sit-down dining.

Question 3

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

Accepted Answer

Move the decimal one place left to find 10%, then double it. A $47 bill: 10% is $4.70, doubled is $9.40 — that is your 20% tip. For 15%, find 10% and add half of that: 10% of $47 is $4.70, half of that is $2.35, so 15% is $7.05. The reason this works is that tip math is just percentage math, and percentages above 10 are always easier to build up from 10 than to compute directly. The calculator handles all the exact arithmetic, but knowing the shortcut means you can sanity-check the screen before you hand someone your card.

Question 4

How do I split a restaurant bill fairly?

Accepted Answer

Enter the full bill in the calculator, set your state's tax rate, choose a tip percentage, then set the number of people — the per-person amount appears instantly. The only fight worth having at a dinner table is whether everyone pays exactly equal shares or whether the person who ordered the $14 cocktail and the person who drank water split differently. This calculator gives you the equal-split number. If people ordered very differently, the cleanest approach is to have each person pay for what they ordered plus their proportional share of tax and a shared 20% tip on the total.

Question 5

Which US states have no restaurant sales tax?

Accepted Answer

Five states charge zero state sales tax: Alaska, Delaware, Montana, New Hampshire, and Oregon. Alaska allows local municipalities to charge their own rates (the average combined rate is 1.82%), so your bill in Juneau might look different from a bill in a rural Alaskan town. The other four are genuinely tax-free at the register. Beyond the no-tax states, Hawaii has the lowest rate at 4.50% combined, followed by Wisconsin at 5.72% and Wyoming at 5.56%. Louisiana sits at the other extreme with a combined 10.11% — the highest in the country — which adds $5.06 to a $50 bill before you tip a single dollar.

Question 6

How much is tax and tip on a $100 restaurant bill?

Accepted Answer

Using a national average combined sales tax rate near 7%, tax on a $100 bill is $7, bringing the subtotal to $107. A 20% tip on that $107 total is $21.40, for a grand total of $128.40. A 15% tip instead brings the total to $123.05. The gap between tipping 15% and 20% on a $100 bill is $5.35 — roughly the price of a coffee. The bigger variable is your state: in Louisiana, that same $100 meal carries $10.11 in tax, pushing the total before tip to $110.11. In Oregon, there is no sales tax at all, so your $100 meal plus a 20% tip costs exactly $120.00.

Tax and Tip Calculator