About the Discount Calculator
Work out the final price after one or more discounts, plus tax. Two stacked discounts (e.g. 30% + 10%) are not the same as one 40% discount, and this shows the true effective discount.
How to use
- Enter the price and the discount percentage.
- Add an extra coupon discount or tax if needed.
Formula
Final = P × (1 − d₁) × (1 − d₂) × (1 + tax)
Frequently asked questions
How do I calculate a discount?
Multiply the price by (1 − discount ÷ 100). A 25% discount on 80 gives 80 × 0.75 = 60.
Is 30% + 10% off the same as 40% off?
No. Stacked discounts apply one after the other, so 30% then 10% off equals 37% off in total, not 40%.
Is tax charged before or after the discount?
Usually after. This calculator applies tax to the discounted price.