Sale signs love big percentages, but the price that matters is what you actually pay at the register. The Discount Calculator turns a list price and one or more discounts into the real sale price, the amount you save, and the final total with tax included.
How discounts are calculated
A single discount reduces the price by a percentage of the original. The sale price is what remains after subtracting the discount.
savings = price * (discount% / 100) sale price = price - savings with tax = sale price * (1 + tax% / 100)
Stacked discounts
When discounts stack, each one applies to the already-reduced price, not the original. This is why 20% off followed by 10% off is not 30% off. On a 100 item, 20% off leaves 80, and a further 10% off leaves 72, an effective discount of 28%, not 30%.
How to use the Discount Calculator
- Enter the original price
- Add one or more discount percentages to apply in sequence
- Optionally enter a tax rate to include at checkout
- Read the final sale price and your total savings
Smart shopping checks
- Compare a single big discount against two stacked ones
- See whether a coupon beats a percentage sale
- Add tax to know the true out-the-door price
- Confirm the advertised effective discount is accurate
By showing the math clearly, the Discount Calculator helps you spot genuine bargains and avoid the trap of misleading combined-percentage claims.
