Work out the price after a discount, the percentage off between two prices, or the price before the discount.
Price after discount
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Enter the prices and the discount to see the result.
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Choose what you want to work out, then enter the prices and the discount. You get the price after the discount, the amount and percentage off and the price multiplier, with every step shown. It also handles two discounts in a row, such as an extra 10% off at the till on an item that is already reduced.
‘% off’ takes a percentage off a price. ‘Amount off’ takes a sum off and tells you what percentage it is. ‘Find the %’ compares an original price with a reduced one. ‘Was price’ finds the price before the discount from the price paid and the percentage off.
In ‘% off’, the ‘Extra discount’ field takes a second percentage off the already reduced price. The calculator shows each step and the single discount the two add up to: 30% then 10% make 37% off, not 40%.
Enter every price on the same basis. A percentage off is the same whether prices include VAT or not, as long as the VAT rate does not change. An amount off is not: £10 off the price before VAT is £12 off the price including VAT at 20%.
Amounts are rounded to the nearest penny, with halves rounded up. The amount off and the price after the discount always add back up to the original price. Percentages worked out from two prices are rounded to two decimal places, and the price multiplier to four.
Amount off = original price × percentage ÷ 100, then price after discount = original price − amount off.
Percentage off = (original price − price after discount) ÷ original price × 100.
Original price = price after discount ÷ (1 − percentage ÷ 100).
Two discounts a and b in a row: multiplier = (1 − a) × (1 − b), and overall discount = 1 − multiplier.
First discount: £85.00 × 20% = £17.00, leaving £68.00. Extra discount: £68.00 × 15% = £10.20, leaving £57.80 to pay. You save £27.20, which is 32% off overall, not 35%, because (1 − 20%) × (1 − 15%) = 0.8 × 0.85 = 0.68.
Multiply the price by the percentage and divide by 100: 20% off £49.99 is £49.99 × 20 ÷ 100 = £10.00 to the nearest penny, so you pay £39.99. Or multiply the price by 1 minus the percentage: £49.99 × 0.8 = £39.99.
Divide the difference by the original price and multiply by 100. A product cut from £120 to £90 is £30 cheaper, which is 30 ÷ 120 × 100 = 25% off.
No. The second discount is taken off the already reduced price, so 20% then 10% leave (1 − 0.2) × (1 − 0.1) = 0.72 of the price, which is 28% off, not 30%.
Divide the price paid by 1 minus the percentage: £34.99 after 30% off was £34.99 ÷ 0.7 = £49.99, to the nearest penny. Adding 30% back on gives £45.49, which is wrong, because the discount was a share of the original price, not of the reduced one.
Since 6 April 2025, misleading price claims have been unfair commercial practices under the Digital Markets, Competition and Consumers Act 2024, which replaced the Consumer Protection from Unfair Trading Regulations 2008. In its March 2023 examples of non-compliance, to which its 2025 guidance still refers, the Competition and Markets Authority says that the higher price in a price reduction claim must be a genuine and realistic selling price, which the business should be able to show. A higher price charged only briefly, at which very few items sold, or undercut by lower prices since, is likely to mislead.
On the discounted price, when the discount is unconditional and the customer pays the discounted amount (HMRC VAT Notice 700, paragraph 7.3.2). Prompt payment and other conditional discounts follow their own rules, set out in the same paragraph.
This calculator gives general information, not legal, tax, financial or accounting advice. Before you advertise a reduced price, check it against the CMA’s guidance or ask an adviser.
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