Discount Calculator
Enter the original price and the discount percentage to see the sale price, the amount you save and the effective discount. Add a second coupon-style discount or a tax rate and the calculator applies them in the order a shop would: first discount, then extra discount, then tax. Every step is written out so you can check it against the price tag.
Work Out the Sale Price After a Discount
Each amount is rounded to 2 decimals (half up) at every step, like a shop receipt. A second discount is taken from the already-reduced price, so 20% + 10% is 28% off, not 30%.
Your price
Formula and working
How to Use the Discount Calculator
- Type the original price and the discount percentage.
- Optionally add an extra discount % (applied to the reduced price) and a tax % (added at the end).
- Pick a number format and currency symbol if you do not want the default.
- Press Calculate and read the final price, the saving and the working underneath.
About This Tool
Shoppers comparing offers, small-shop owners setting sale prices, and anyone who wants to know what a stacked discount really takes off the price.
Input: Numbers · Output: Price.
Features and Limitations
Features
- Stacks a second discount correctly on the reduced price.
- Optional tax added after the discounts.
- Shows the effective discount over the original price.
- Indian, US or UK digit grouping and a choice of currency symbols.
- Written-out working with the formula.
Limitations
- Percentages must be between 0 and 100.
- Amounts are rounded to 2 decimals at every step; a shop that rounds only at the end can differ by a cent.
- It does not know store-specific rules such as minimum spend, “buy one get one” or per-item caps.
- Results are computed in your browser; nothing you enter is sent to a server.
Example
A 2,499 item with 20% off and a further 10% coupon: 2,499 − 499.80 = 1,999.20; 1,999.20 − 199.92 = 1,799.28. You save 699.72, an effective discount of 28%. Adding 18% tax makes the final price 2,123.15.
Frequently Asked Questions
How do I calculate a discount?
Discount amount = price × discount % ÷ 100, and sale price = price − discount amount. For a 20% discount on 2,499 that is 2,499 × 0.20 = 499.80, so you pay 1,999.20.
Why is 20% off plus 10% off not 30% off?
The second discount applies to the price that is left after the first one: 0.80 × 0.90 = 0.72, so you pay 72% of the original, which is 28% off. The effective discount is 1 − (1 − d₁)(1 − d₂).
Is tax charged before or after the discount?
This tool assumes the usual retail case: tax is charged on the discounted price. Some places tax the original price (for example certain manufacturer coupons); in that case, work out the tax separately.
How is the effective discount worked out?
Effective discount = (original price − price after discounts) ÷ original price × 100, using the rounded money amounts, before tax is added.
Related Tools
More like this: all Finance tools, all Calculators tools or the TinySandy home page.