Discount calculator
Find the sale price and savings after one or two percentage discounts.
Enter your values and press Calculate. Your inputs stay in the address, so you can switch language or share the link.
Formula
sale price = price × (1 − d₁) × (1 − d₂)
How it works
A discount of d% leaves (100 − d)% of the price. Two discounts multiply rather than add: 20% off and then 10% off is 28% off, not 30%.
Worked example
The same calculation with the default values:
- Original price 80
- Discount 25 %
- Additional discount (optional) 0 %
- after first discount = 80 × (1 − 25 ÷ 100) = 60
- sale price = 60 × (1 − 0 ÷ 100) = 60
- savings = 80 − 60 = 20
Result: Sale price: 60.00 USD · You save: 20.00 USD · Total discount: 25%
Two successive discounts (e.g. 20% then 10%) do not add up to a simple 30% off - each discount applies to the already-reduced price, so the combined effect is always slightly less than the sum of the two percentages.
Common mistakes
- Adding two discount percentages together (20% + 10% = 30% off) instead of applying them one after another - the correct combined discount is always a little less than the simple sum.
- Applying a second discount to the original price instead of the already-discounted price, which overstates the total savings.
- Confusing the discount percentage with the final price percentage - a 25% discount means paying 75% of the original price, not 25% of it.
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