Tip Calculator
This tip calculator works out the tip, the total and each person’s share from the bill, the tip percentage and the number of people. It can round the total or each share up to the next dollar and then tells you the tip percentage you actually ended up leaving. A table underneath shows the tip at 10, 15, 18, 20, 22 and 25% at once.
How to use the tip calculator
- Enter the bill. The calculator starts at
$64.50. - Enter the tip percentage. The default is 18%.
- Enter how many people are splitting the bill. The default is 2.
- Pick a rounding option: no rounding, round the total up to the next dollar, or round each person’s share up to the next dollar. Change the currency symbol if you are not paying in dollars.
With the defaults, the tip is $64.50 × 0.18 = $11.61, the total is $76.11 and each of the two people owes $76.11 ÷ 2 = $38.055, which is $38.06 to the cent. Because half a cent cannot be paid, one person pays $38.06 and the other $38.05, or you both pay $38.06 and leave an extra cent.
Below the result, the steps panel writes out each multiplication and division with your numbers in it, and the percentage table lets you compare tip levels without retyping anything. When you choose a rounding option, the calculator also shows the effective tip percentage, which is the real share of the bill you are leaving once the rounding is added in.
The tip formula
A tip is a percentage of a number, so the method is the same one used for any “X% of Y” question. Dividing the percentage by 100 turns it into a decimal: 18% becomes 0.18, 20% becomes 0.2 and 22% becomes 0.22. Multiplying the bill by that decimal gives the tip. The percent to decimal calculator shows the conversion if any rate looks awkward.
You can also skip the separate addition step by multiplying the bill by 1 + rate. An 18% tip on $64.50 gives a total of $64.50 × 1.18 = $76.11 in one go. This is useful on a phone calculator, and it is the same multiplier idea used when adding sales tax.
Splitting comes last. Dividing the total, not the bill, means everyone’s share already includes their part of the tip. If you split the bill first and then work out each person’s tip separately, the answer is the same, but there are more chances for a rounding slip.
Worked examples
Example: a 15% tip on $47.80
Fifteen percent is ten percent plus half of ten percent, which makes it easy without a calculator.
Check: $47.80 × 0.15 = $7.17, so the shortcut gives the exact answer.
Example: 20% on $86.40, split four ways
Twenty percent is ten percent doubled.
The share divides evenly, so all four people pay $25.92 and the total is exact.
Example: 18% on $142.60, each share rounded up
Four people want whole-dollar amounts so nobody has to deal with coins.
Rounding each share up added almost a dollar per person, and with four people that lifted the tip from 18% to about 20.62%. Rounding the total up to $169 instead would have given a tip of $26.40, about 18.51%.
Rounding the total or each share
The three rounding settings answer three different questions, and on the default bill they give three different tips.
| Rounding | Total | Each of 2 pays | Tip left | Effective tip |
|---|---|---|---|---|
| No rounding | $76.11 | $38.06 (≈ $38.055) | $11.61 | 18% |
| Round the total up | $77.00 | $38.50 | $12.50 | ≈ 19.38% |
| Round each share up | $78.00 | $39.00 | $13.50 | ≈ 20.93% |
Rounding the total up is the choice for one card paying the whole bill: the extra goes on the tip line, and the receipt ends in a round number that is easy to check against your statement later. Rounding each share up suits a group where everyone pays separately, but the extra is multiplied by the number of people. With two people it adds $1.89 here; with eight people it could add close to $8.
The effective tip line is there so the rounding does not surprise you. It is just the actual tip divided by the bill, the same calculation the reverse percentage calculator uses when it works back from a finished amount. If you want to stay close to the percentage you chose, round the total; if you want simple cash amounts for everyone, round each share and accept the higher tip.
The general rules for when to round and to how many places are covered in rounding to decimal places. For money the rule is simple: keep full precision until the last step, then round to the cent once.
Tip calculator percentage chart
The widget builds a percentage table for whatever bill you type. For quick reference, here are the tips on some round bill amounts. Each cell is the tip only; add it to the bill for the total.
| Bill | 15% | 18% | 20% | 22% | 25% |
|---|---|---|---|---|---|
| $20 | $3.00 | $3.60 | $4.00 | $4.40 | $5.00 |
| $40 | $6.00 | $7.20 | $8.00 | $8.80 | $10.00 |
| $60 | $9.00 | $10.80 | $12.00 | $13.20 | $15.00 |
| $80 | $12.00 | $14.40 | $16.00 | $17.60 | $20.00 |
| $100 | $15.00 | $18.00 | $20.00 | $22.00 | $25.00 |
| $150 | $22.50 | $27.00 | $30.00 | $33.00 | $37.50 |
Two patterns make the chart easy to extend. Every column is proportional, so the tip on $160 is twice the tip on $80. And every row can be built from 10%: 20% is 10% doubled, 15% is 10% plus half of it, and 25% is a quarter of the bill. The guide on working out a discount, sales tax and a tip in your head goes through these shortcuts in more detail.
Tipping on the pre-tax or after-tax amount
A restaurant bill usually shows a subtotal, then sales tax, then the total. Some people tip on the subtotal, since the tax is not part of the service; others tip on the final total because it is the number in front of them. Neither is a math rule. The difference is small but worth seeing:
Tipping on the after-tax total is the same as tipping 20% on the subtotal plus 20% of the tax. Here that works out to a tip equal to 21.6% of the pre-tax food bill. To tip on the subtotal, type the pre-tax amount into the bill field. If you need to pull the tax back out of a total first, the sales tax calculator has a mode that does exactly that.
The same question comes up with coupons and discounts. If a deal took $20 off, many people tip on the price before the discount, because the service was the same. Again, enter whichever amount you want the tip based on; the formula does not change.
Common mistakes
- Moving the decimal point the wrong way. 10% of $64.50 is $6.45, not $0.645 or $645. Ten percent means one tenth, so the number gets smaller by one place.
- Using 0.18 as “18” in a phone calculator.
64.50 × 18is $1,161, which is the tip multiplied by 100. Divide by 100 or type 0.18. - Splitting the bill and forgetting the tip. Each person’s share should come from the total, not the bill. Dividing $64.50 by 2 gives $32.25, which leaves the tip unpaid.
- Rounding each person’s tip before adding. Round once, at the end. Rounding at every step can drift the total by several cents across a large table.
- Forgetting that rounding up changes the percentage. Rounding each share up for a big group can add several dollars. Check the effective tip line.
- Adding percentages to the wrong base. An extra 5% on top of an 18% tip is 23% of the bill, not 18% plus 5% of the tip. Both are percentages of the same bill.
If a group is splitting very unevenly, work out each person’s items first, then apply the same tip percentage to each subtotal. The percentage calculator handles each person’s “18% of my part” on its own, and the division calculator shows the long division if a share does not come out to whole cents.
Frequently asked questions
How much is an 18% tip on $64.50?
An 18% tip on $64.50 is $64.50 × 0.18 = $11.61, making the total $76.11. Split between two people, that is $38.055 each, so in practice one pays $38.06 and the other $38.05. Rounding the total up to $77 would make the tip $12.50, which is about 19.38% of the bill.
What is 20% of $80 for a tip?
A 20% tip on $80 is $16, so the total is $96. The quick way is to find 10% by moving the decimal point one place left, which gives $8, and then double it. That doubling trick works for any bill, which is why 20% is one of the easiest tip percentages to work out in your head.
How do you calculate a tip percentage?
Convert the percentage to a decimal by dividing by 100, then multiply the bill by it. For 15% on $47.80, $47.80 × 0.15 = $7.17. To find what percentage you already left, go the other way: divide the tip by the bill and multiply by 100. A $12.50 tip on $64.50 is about 19.38%.
How do you split a bill with a tip?
Add the tip to the bill first, then divide the total by the number of people. For $86.40 with a 20% tip shared by four, the tip is $17.28, the total is $103.68 and each share is $103.68 ÷ 4 = $25.92. Splitting the total rather than the bill makes sure everyone pays their part of the tip.
Should I tip on the total before or after tax?
Either is common; it is a personal choice rather than a rule. Tipping on the pre-tax subtotal is slightly cheaper. On an $80 subtotal with $6.40 tax, a 20% tip is $16.00 on the subtotal or $17.28 on the $86.40 total. Type whichever amount you want the tip based on into the bill field.
What is a 15% tip on $100?
A 15% tip on $100 is $15, for a total of $115. With a bill of exactly $100, the percentage and the dollar amount are the same number, which makes $100 a handy reference point: an 18% tip is $18, 20% is $20 and 25% is $25. Scale from there for other bills.
Why does rounding up change my tip percentage?
Every dollar added by rounding goes to the tip, so the tip grows while the bill stays the same. On $64.50 at 18%, rounding the total from $76.11 to $77 raises the tip from $11.61 to $12.50, about 19.38%. Rounding each of two shares up to $39 raises it to $13.50, about 20.93%.
Related calculators
Guides that use this calculator
Longer explanations of the method behind it, with worked examples.
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