Online shopping
Sale pages often show the discount percentage but not the final price. Work it out in one glance.
Two modes · Live · Private
Discount Calculator
Work out the sale price, the savings, or the original price from any percentage discount. Presets for common sale percentages.
An item is X% off. What do you pay?
Quick:
Sale price
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Enter a price to see the sale price and savings.
The Discount Formulas
Mode 1 — From an original price
You know the original price and the discount. To find the sale price:
Savings = (Price × Discount%) ÷ 100
Sale price = Price − Savings
Example: £80 with 25% off → savings £20, sale price £60.
Mode 2 — Find the original price
You know the sale price and the discount received. To find the original price, divide by the remaining fraction:
Original = Sale price ÷ (1 − Discount/100)
Example: sale price £60 after 25% off → original = £60 ÷ 0.75 = £80.
Double discounts
A common misconception: two 20% discounts do not equal 40% off. They equal 36% off. The second discount applies to the already-reduced price. £100 → £80 → £64 = 36% total savings.
To work out a double discount manually, apply the first, then apply the second to the result. Or multiply the remaining fractions: (1 − 0.20) × (1 − 0.20) = 0.64, meaning you pay 64% of the original.
3-for-2 and similar offers
A 3-for-2 offer is equivalent to a 33.33% discount on the total. Enter 33.33% in mode 1 to see the effective reduction.
Tax
This calculator does not include sales tax or VAT. In most countries tax is applied after the discount, so add it to the sale price if you want the final amount.
Common Discounts
| Original | Discount | Sale price | Saved |
|---|---|---|---|
| £80 | 25% | £60.00 | £20.00 |
| £50 | 10% | £45.00 | £5.00 |
| £120 | 30% | £84.00 | £36.00 |
| £200 | 15% | £170.00 | £30.00 |
| £29.99 | 50% | £14.99 | £15.00 |
| £350 | 40% | £210.00 | £140.00 |
When You'll Need This
Black Friday
Compare two deals quickly: is 30% off a £200 item better than 40% off a £160 item? Do the maths.
Reverse engineer a price
You know the sale price and the discount. Find the original to check if the discount is real.
Stacked discounts
An extra 10% off sale items is not the same as 10% off the original. Work out what you actually pay.
Retail & eBay
Sellers price for markup and discount. Reverse the maths to set your own pricing.
Budget planning
See the real savings on your shopping list before you check out.
Discount FAQ
How do I calculate a discount?
Multiply the original price by the discount percentage, then divide by 100 to get the savings. Subtract the savings from the original price to get the sale price.
How do I calculate the original price from the sale price?
Divide the sale price by (1 minus discount/100). For example, if the sale price is £80 and the discount was 20%, the original price was £80 ÷ 0.8 = £100. Use mode 2 above.
What is double discounting?
A double discount applies one discount on top of another. Two 20% discounts do not equal 40% off — they equal 36% off, because the second discount applies to the already-reduced price.
Does the calculator handle tax?
No. This calculator shows the discount only. Sales tax or VAT is applied after the discount in most jurisdictions, so add it on top of the sale price if needed.
How do I work out a 3 for 2 deal?
A 3-for-2 offer is equivalent to a 33.33% discount on the total. Use mode 1 with a 33.33% discount to see the effective reduction.
Is this the same as the percentage calculator?
It is related but focused on shopping. The percentage calculator has six general-purpose modes. This one is optimised for discounts, with presets and the reverse mode built in.
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