How Much to Tip on a $100 Bill (Fast Answer + Chart)

How much to tip on a $100 bill: at 20% you tip $20 and pay $120 total. At 18% you tip $18 ($118 total). At 15% you tip $15 ($115 total). That is the whole answer. Everything below is the chart, the math shortcut, and the edge cases.

$100 bill at every common tip rate

• 10% = $10 tip, $110 total
• 15% = $15 tip, $115 total
• 18% = $18 tip, $118 total
• 20% = $20 tip, $120 total
• 25% = $25 tip, $125 total

A $100 bill is the friendliest number in tipping. The percentage is the dollar amount. No calculator needed. For every other bill amount, the Tip Calculator handles it in a second.

What if my bill is not exactly $100?

Most bills land near $100 without hitting it. Here is a wider quick-reference chart for the three rates people actually use. Tip first, total in parentheses.

$50 bill

• 15% = $7.50 (total $57.50)
• 18% = $9.00 (total $59.00)
• 20% = $10.00 (total $60.00)

$75 bill

• 15% = $11.25 (total $86.25)
• 18% = $13.50 (total $88.50)
• 20% = $15.00 (total $90.00)

$100 bill

• 15% = $15.00 (total $115.00)
• 18% = $18.00 (total $118.00)
• 20% = $20.00 (total $120.00)

$125 bill

• 15% = $18.75 (total $143.75)
• 18% = $22.50 (total $147.50)
• 20% = $25.00 (total $150.00)

$150 bill

• 15% = $22.50 (total $172.50)
• 18% = $27.00 (total $177.00)
• 20% = $30.00 (total $180.00)

$200 bill

• 15% = $30.00 (total $230.00)
• 18% = $36.00 (total $236.00)
• 20% = $40.00 (total $240.00)

Is $20 a good tip on $100?

Yes. $20 on $100 is 20%, and 20% is the standard for solid sit-down service in the US and Canada. Nobody looks at a 20% tip and thinks twice. It is the safe default when you do not want to think about it.

Go to $25 (25%) when the server did something extra: held the table, fixed a wrong order fast, handled a big group, kept water full all night. Drop to $15 only when service genuinely missed, not when the kitchen was slow. Servers rarely control the kitchen.

The one place $20 gets stingy is a $100 bill that took three hours. A two-top nursing wine until close occupies a table the server could have turned twice. Same $20, half the earnings. If you camp, tip like you stayed. More on the reasoning in is 20% a good tip.

How do you do the tip math in your head?

Three steps. That is it.

• Find 10%: move the decimal one place left.
• Double it for 20%.
• For 15%: take the 10% number and add half of it.

On $100 it is trivial. 10% is $10. Double it, $20, that is your 20%. Half of $10 is $5, so 15% is $15. Done before the receipt hits the table.

Now try it on an awkward number: $86

Move the decimal: 10% of $86 is $8.60.

• 20% = double $8.60 = $17.20 (total $103.20)
• 15% = $8.60 + $4.30 = $12.90 (total $98.90)
• 18% = 20% minus 2%, so $17.20 - $1.72 = $15.48 (total $101.48)

In practice, most people round $17.20 up to $18 and stop thinking. That is fine. Rounding up a dollar is the cheapest goodwill you will ever buy. If you want the exact figure on a messy total like $86.43, the Tip Calculator is faster than doing it twice in your head to check.

Need a percentage of something that is not a restaurant bill? The Percentage Calculator covers the general case.

Do you tip on tax?

Technically, tipping on the pre-tax subtotal is correct. Tax is money the restaurant collects for the government. The server did not serve you the tax. But almost nobody actually does this, and on small bills the difference is pennies.

On a $100 bill it starts to matter. Say tax is 13%. Your check reads $113. Tip 20% on the pre-tax $100 and you leave $20. Tip 20% on the post-tax $113 and you leave $22.60. That is a $2.60 gap on one dinner.

Scale it up. On a $500 bill at 13% tax, tipping post-tax adds about $13 versus pre-tax. Real money for a group dinner, and real money to the server over a shift.

Practical rule: tip post-tax on normal bills. It is simpler, the number on the check is right there, and the extra couple of dollars is not worth the mental overhead. On a $400 party bill, pre-tax is defensible and no one will notice. Just pick one and stop relitigating it every meal.

How do you split a $100 bill with tip?

Add the tip first, then divide. Splitting the bill and tipping separately is where groups short the server without meaning to.

At 20% ($120 total)

• 2 people: $60 each
• 4 people: $30 each

At 18% ($118 total)

• 2 people: $59 each
• 4 people: $29.50 each

At 15% ($115 total)

• 2 people: $57.50 each
• 4 people: $28.75 each

Two warnings. First, the person handling cash usually eats the rounding, so round up, not down. Second, uneven splits (one person had a $9 salad, another had $40 of steak and cocktails) break the flat divide entirely. Split by what each person ordered, then apply the same tip percentage to each share. The Tip Calculator has a split field for exactly this.

What about automatic gratuity on the check?

Read the itemized lines before you tip. Many restaurants add an automatic gratuity for parties of six or more, usually 18% to 20%. If your $100 bill already shows an $18 gratuity line and a $118 total, the tip is done. Adding another $20 on top means you tipped roughly 38%.

It hides in plain sight. Look for "gratuity," "service charge," "auto-grat," or "18% added for parties of 6+." The credit card slip will sometimes still print a blank tip line underneath. That blank line is optional, not an obligation.

Worth knowing: a "service charge" is not always a tip. Some venues keep it as revenue or split it across the house. If the receipt says service charge and you loved your server, a small extra cash tip goes straight to them. If it says gratuity, it is going to staff already.

One more case: an auto-grat applied at 18% on a bill where service was outstanding. Nothing stops you from adding $5 to $10 on the line below. Nothing requires it either.

Bottom line

On a $100 bill, tip $20 and pay $120. That is 20%, the standard, and it takes zero math. Drop to $18 if you are watching the budget. Go to $25 if the service was genuinely good. Check for an auto-gratuity line before you add anything, and add the tip before splitting with the table.

For bills that are not round numbers, or splits that are not even, run it through the Tip Calculator. For every other situation, from bartenders to hotel housekeeping to delivery drivers, see the full guide to how much to tip.