Discount and tip calculator
Two everyday percentage sums: what you pay after a discount, and what a tip adds to a bill. Both show how the answer is reached.
Discount calculator: what is the sale price?
Tip calculator: tip, total and split
How it works
Discounts: find the saving, or go straight to the price
A 25% discount on 80 is 80 × 25 ÷ 100 = 20, so you pay 60. The shortcut is to work out what is left: 25% off means paying 75%, and 75% of 80 is 60. Both routes are shown so you can check one against the other.
Tips from 10%
Most tips are easy to build from 10%. Move the decimal point one place to find 10% of the bill. Double it for 20%. For 15%, add half of the 10% figure. On a bill of 60, 10% is 6, so 15% is 9 and 20% is 12.
Two discounts do not add up
20% off followed by a further 10% off is not 30% off. The second discount applies to the already reduced price: 100 becomes 80, then 72. That is 28% off in total. Run the calculator twice to see it.
Rounding
Amounts are shown to 2 decimal places and rounded half up, so a split bill can differ from the total by a small amount. The calculator says when rounding has happened. It does not assume a currency, and tipping customs vary from country to country.
Worked examples
A jacket is 120 with 35% off
You pay 78
- You save 42
- Find the discount, 35% of 120: 120 × 35 ÷ 100 = 42.
- Take it off the price: 120 − 42 = 78.
- Shortcut: 35% off means you pay 100% − 35% = 65% of the price. 120 × 65 ÷ 100 = 78.
A 59.99 pair of shoes with 30% off
You pay 41.99
- You save 18.00
- Find the discount, 30% of 59.99: 59.99 × 30 ÷ 100 ≈ 18.00.
- Take it off the price: 59.99 − 18.00 ≈ 41.99.
- Shortcut: 30% off means you pay 100% − 30% = 70% of the price. 59.99 × 70 ÷ 100 ≈ 41.99.
- Amounts are rounded to 2 decimal places.
A bill of 86.40 with a 12.5% tip, split between 4
Total 97.20
- Tip 10.80
- 24.30 each for 4 people
- Find the tip, 12.5% of 86.40: 86.40 × 12.5 ÷ 100 = 10.80.
- Add it to the bill: 86.40 + 10.80 = 97.20.
- Split it 4 ways: 97.20 ÷ 4 = 24.30 each.
Common questions
How do I work out 15% of a bill in my head?
Find 10% by moving the decimal point one place to the left, halve that to get 5%, and add the two together. For a bill of 40, that is 4 + 2 = 6.
How do I find the original price from a sale price?
Divide the sale price by the fraction you paid. After 30% off you paid 70%, so divide by 0.7. The reverse percentage tool on the percentage calculator page does this with the working.