Percentage Calculator / Discount calculator
Discount Calculator
Take a percentage off any price, check what percent off a sale really is, work back to the original price, and see what two stacked discounts actually add up to.
Take a percentage off
Sale price and savings
Work backwards
What percent off is it
Original price before the discount
Two discounts stacked
How to calculate a discount step by step
A worked example taking 25% off $89.99. The calculator above does this instantly, but here is the arithmetic behind it.
1. Turn the percent into a decimal
25 ÷ 100 = 0.25
2. Multiply to find the saving
89.99 × 0.25 = 22.50
3. Subtract it from the price
89.99 − 22.50 = 67.49
4. Or do it in one step
89.99 × 0.75 = 67.49
The one-step version is the quickest mental shortcut: 30% off means paying 70%, 40% off means paying 60%, and so on.
Why stacked discounts are smaller than they look
"30% off, then an extra 20% off at the till" is not 50% off. The second discount is taken from the already-reduced price, so you pay 70% of 80% — that is 56% of the original, a 44% total discount.
The order does not matter: 20% then 30% lands on the same figure. What matters is that each percentage applies to a smaller number than the one before it, which is why the total is always less than the two percentages added together.
Common discount answers
The percent-off sums people look up most. Change any number above for your own prices.
Discount questions people ask
How do I calculate a percentage off a price?
- Multiply the price by (1 − percent off ÷ 100). Example: $89.99 with 25% off = 89.99 × 0.75 = $67.49, saving $22.50.
How do I work out what percent off I got?
- Divide the amount saved by the original price and multiply by 100. Example: $80 down to $60 saved $20, and 20 ÷ 80 × 100 = 25% off.
How do I find the original price from a sale price?
- Divide the sale price by (1 − percent off ÷ 100). Example: $60 after 25% off was originally 60 ÷ 0.75 = $80.
Do two discounts add together?
- No. An extra 20% off an already 30%-off price is not 50% off. The second discount applies to the reduced price: 0.70 × 0.80 = 0.56, so it is 44% off in total.
What is 20% off $100?
- $80. The 20% saved is $20, taken off the $100 original.
Should I apply the discount or the tax first?
- Discount first. Tax is normally charged on the amount you actually pay, so reduce the price, then add tax to the reduced figure.
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