Discount Calculator
Work out a sale price from a discount, see what two or three discounts in a row really cost, or find the original price from a sale price.
Ce contenu est en anglais.
Sale price after a discount
Several discounts in a row
Find the original price
Exemples détaillés
Two discounts in a row
20% off £100, then 10% off the reduced price
You pay £72, which is 28% off the original price in total.
The second discount applies to £80, not £100, so the two reductions do not add up to 30%.
Single sale price
30% off £60
Sale price £42.
The discount is 30 per cent of £60, which is £18, taken from the original price.
À propos de Discount Calculator
A discount calculator shows the sale price after a percentage off, the amount you save and what a price was before a reduction. Enter the original price and the discount to see the sale price straight away, or enter the sale price and its discount to work backwards to the price before the sale began. It is useful when shopping, when checking that an offer is as good as it looks, or when comparing deals across different shops. Many shoppers assume discounts stack in a simple way, so a quick check before buying can prevent a disappointing surprise at the till.
The calculator also handles discounts applied one after another, which is where many people go wrong. Two reductions of 20% and 10% do not add up to 30%. The second reduction is worked out on the price left after the first, so the total saving is 28%. Enter up to three discounts to see the price after each stage, the combined saving and the single percentage that equals the whole set of reductions. Sale notices and online basket totals rarely explain this, so the calculator fills the gap.
Comment utiliser Discount Calculator
- Enter the original price and the discount to see the sale price and the saving.
- Add up to three discounts in the next box to see them applied one after another.
- Enter a sale price and its discount to find what the original price was.
- Copy the result if you want to keep a note of the figures.
Usages courants
- Checking the real saving on a sale item before buying it
- Comparing a percentage discount with a flat amount off
- Working out what a reduced price was before a sale started
- Understanding stacked offers in a shop or an online basket
Questions fréquentes
How do I calculate a sale price from a percentage discount?
Work out the discount amount by multiplying the price by the percentage and dividing by 100, then subtract that amount from the original price. For example, a £60 jacket with 25% off has a discount of £15, so the sale price is £45. A quicker way is to multiply the price by 0.75, which is what remains after 25% is taken off. The calculator does both steps for you.
Are two discounts of 20% and 10% the same as 30% off?
No. The second discount is taken off the reduced price, not the original. On £100, 20% off gives £80, and 10% off that gives £72. The total saving is £28, which is 28% of the original price. A single 30% discount would have given £70, so the stacked offer is a little less generous than it sounds. Enter your own figures to see the exact result.
How do I work out the original price from a sale price?
Divide the sale price by one minus the discount written as a decimal. If something costs £80 after 20% off, one minus 0.20 is 0.80, and £80 divided by 0.80 is £100. Dividing rather than adding 20% matters, because adding 20% to £80 gives £96, which is wrong. The calculator uses the correct method and also shows how much was saved.
Why does adding a percentage back to a sale price not give the original?
The percentage is always taken from a different starting figure. A 20% reduction takes away a fifth of the original price, but the sale price is only four fifths of the original. So 20% of the sale price is smaller than the amount that was removed, and adding it back falls short. Dividing by 0.80 gives the true original price every time.
Is the discount calculator accurate for shop prices?
The results are accurate for the figures you enter, rounded to the nearest penny at each stage. Shops sometimes round differently, apply limits to a discount or leave certain items out of an offer. Always check the price shown at the till or on the checkout page before paying, because the final amount depends on the terms the seller has set.