How this calculator works
This is the reverse of the tip calculator. That one starts from a percentage and works out the dollar amount; this one starts from a dollar amount — the cash you left, or the total that showed up on your card statement — and works out what percentage that actually was. It's the calculation you need after the fact: splitting a group tip that someone else rounded to a number, checking a tip on an expense report, or just being curious whether you under- or over-tipped.
Enter the bill either way: if you know exactly what you left as a tip, use that; if you only remember the total you paid, the calculator subtracts the bill to find the tip first. Both paths land on the same percentage for the same underlying numbers, and the reference table below shows what common percentages (10% through 25%) would have worked out to on the same bill, so you can see at a glance whether your tip landed above or below the usual range.
The formulas
Tip percentage = (tip amount ÷ bill) × 100Tip amount (from a total) = total paid − billWorked example: reconstructing the tip from a total
- Bill was $60.00, and the total charged to the card was $70.80.
- Tip amount: 70.80 − 60.00 = $10.80.
- Tip percentage: (10.80 ÷ 60.00) × 100 = 18%.
- For comparison, a 20% tip on the same $60 bill would have been $12.00, for a $72.00 total — so this tip landed a little under the common 20% mark.
Frequently asked questions
How do I find the tip percentage from my card statement?
Switch to "the total I paid" mode, enter the bill amount from the receipt and the total your card was charged. The calculator subtracts the bill from the total to get the tip, then divides by the bill to get the percentage.
What's a normal tip percentage to compare against?
In the US, 15-20% is customary at sit-down restaurants, with 18% a common middle ground. The reference table shows exactly what 10%, 15%, 18%, 20% and 25% would have been in dollars on your specific bill, so you can see how your actual tip compares.
Does this work if an automatic gratuity was already added?
Yes, mathematically — enter the bill before any auto-gratuity and the total you actually paid, and the calculator reports the effective percentage. Just be aware that many restaurants add an automatic 18-20% gratuity for larger parties, so check your receipt before assuming any extra amount was a voluntary tip.
Why is my calculated tip percentage not a round number?
Because most people tip a round dollar amount (like leaving $10) rather than calculating an exact percentage, or the bill itself wasn't a round number. A tip percentage of 17.3% instead of a clean 18% just reflects that the cash amount left didn't divide evenly into the bill.
How do I find the original bill if I only know the total I paid and the percentage I tipped?
Rearrange this calculator's formulas: since tip = total − bill and tip percentage = (tip ÷ bill) × 100, solving for bill gives bill = total ÷ (1 + tip% ÷ 100). For example, a $72.00 total with a 20% tip means the bill was 72.00 ÷ 1.20 = $60.00.