The price after a discount, what you save and the total discount, or the original price worked back, with every step shown.
Sale price
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Enter a price and a discount to see the result.
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Enter the original price and the percentage off to get the sale price, what you save and the workings, to the penny. An extra discount, such as “an extra 20% off sale prices”, comes off the price that is already reduced. Only have the sale price? Choose “The original price” to work back to the price before the discount. If you sell, add the lowest price you charged recently to see how your “was” price stands.
Keep “The sale price”, enter the original price and then the discount as a percentage (30 for 30% off). The sale price is shown large, with the discount, what you save and the total discount.
Late in a sale, shops often take “an extra 20% off” prices that are already reduced. Enter it as the extra discount: it comes off the sale price, not the original price. So 30% off and then an extra 20% off is 44% off, not 50%.
Choose “The original price”, then enter the sale price and the discount shown. The original price is the sale price divided by (1 − discount): adding the percentage back on to the sale price gives the wrong answer.
Under the Digital Markets, Competition and Consumers Act 2024, in force for these practices since 6 April 2025, misleading consumers about a price or a price advantage, in a way likely to change their decision, is an unfair commercial practice. The CMA says the higher price in a price reduction claim must be a genuine and realistic selling price, the product’s usual price. Enter the lowest price you charged recently: if it is below your “was” price, the calculator measures the saving against it.
Discount = original price × discount rate, rounded to the nearest penny (an exact half penny goes to the customer).
Sale price = original price − discount.
Extra discount = price after the first discount × extra rate; total discount = 1 − (1 − rate 1) × (1 − rate 2).
Original price = sale price ÷ ((1 − rate 1) × (1 − rate 2)), to the penny that gives back exactly the sale price.
Reduction on the lowest recent price = (lowest recent price − sale price) ÷ lowest recent price.
A jacket priced at £80.00 is reduced by 30%: the discount is £24.00 and the jacket costs £56.00. An extra 20% off then takes £11.20 off that price, so it costs £44.80. That is 44% off in all, a saving of £35.20. Working back, £44.80 ÷ (0.7 × 0.8) = £44.80 ÷ 0.56 = £80.00.
Multiply the original price by (1 − discount). A £49.90 item at 40% off costs £49.90 × 0.6 = £29.94, a saving of £19.96.
No. The extra 20% comes off the price that is already reduced: £100.00 less 30% is £70.00, and 20% off £70.00 leaves £56.00. That is 44% off in all: 1 − 0.7 × 0.8 = 0.44.
Divide the sale price by (1 − discount). An item sold for £35.00 at 30% off was £35.00 ÷ 0.7 = £50.00. Adding 30% to £35.00 gives £45.50, which is wrong: the discount was worked out on £50.00, not on £35.00.
UK law sets no fixed number of days. The CMA looks at whether the higher price was the product’s usual selling price. In its examples, a claim is likely to mislead when the product sold at the higher price only briefly, when few items sold at that price, when the price flip-flopped between two levels, when the product has since been sold for less, when the higher price was a short-lived hike, or when it was charged long ago.
Each discount is rounded to the nearest penny, and an exact half penny goes to the customer: £10.05 at 50% off gives a £5.03 discount and a sale price of £5.02. The sale price is always the original price less the discount, to the penny, so a till that rounds the other way may show a penny’s difference.
This calculator gives general information, not legal, tax, financial or accounting advice. Whether a price reduction claim is lawful depends on the facts: check the CMA’s guidance or take advice.
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