Discount Calculator
Interactive StudioCalculate sale prices, dollar savings, multi-tier stacked coupon discounts, wholesale quantities, and post-discount sales tax in 160+ currencies. Instant feedback with zero server storage.
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About Discount Calculator
Discounts reduce the retail cost of items during sales and promotional events. This studio computes multi-tier stacked discounts (e.g. 20% off + 10% coupon), incorporates sales taxes, and supports wholesale bulk quantities across 160+ world currencies.
How to use Discount Calculator
- Enter the original price and the discount percentage.
- Add a second discount, such as a coupon, if it stacks on top of the first.
- Add a sales tax rate and quantity if you want the final checkout amount.
- Read the sale price, the amount saved and the total after tax.
Worked examples
Input: Price 80, discount 20%, then a further 10% coupon
Result: After 20% the price is 64.00, after the extra 10% it is 57.60. Total saved is 22.40, an effective discount of 28%, not 30%.
Input: Price 200, discount 15%
Result: Sale price 170.00, saving 30.00.
Background
A discount is applied as price x (1 - d/100). Stacked discounts multiply rather than add: 20% followed by 10% leaves 0.8 x 0.9 = 72% of the price, so the effective discount is 28%.
Whether tax is calculated before or after the discount depends on the store and region. In most retail settings tax applies to the discounted price.
Common mistakes
- Adding stacked percentages together. Two successive discounts are always worth less than their sum.
- Forgetting that some coupons apply to the original price rather than the already-reduced price.
- Comparing sale prices without the tax and shipping that apply at checkout.
Frequently Asked Questions
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