Discount Calculator
Calculating discounts is an essential skill for smart shopping. Whether during sales season, Black Friday, or seasonal promotions, knowing exactly how much you save helps you decide better and compare offers honestly.
A $200 product with 30% off ends up at $140, saving you $60. The calculator also solves the reverse case: if you paid $140 for an item that cost $200, the discount applied was 30%.
Discount formulas
Final price = Original price × (1 − Discount/100)
Discount % = ((Original price − Final price) / Original price) × 100
Original price = Final price / (1 − Discount/100)
Step-by-step example
- Original price = $200, discount = 30%
- Discount amount = 200 × 0.30 = $60
- Final price = 200 − 60 = $140
- Total savings = $60 (30% of the original price)
Scenario table (same engine logic)
| Original price | Discount | Savings | Final price | |---|---|---|---| | $200 | 30% | $60.00 | $140.00 | | $200 | 10% | $20.00 | $180.00 | | $500 | 25% | $125.00 | $375.00 | | $80 | 20% | $16.00 | $64.00 | | $1,200 | 15% | $180.00 | $1,020.00 |
Stacked discounts
When discounts are applied in sequence (for example, 20% plus an extra 10%), they do not add up: they apply multiplicatively.
Final price = Original × (1 − 0.20) × (1 − 0.10) = Original × 0.72
That equals a 28% total discount, not 30%. The difference looks small, but on large purchases it means real money.
Tips for taking advantage of discounts
- Always compare the original price before getting excited about the percentage.
- Calculate the real savings in money, not just as a percentage.
- Stackable discounts: check whether the second discount applies to the already-reduced price.
- Unit price: sometimes the "discounted" larger size is not the better deal.
The result also works in reverse: if a store advertises "up to 50% off," check whether it applies to all products or only some. Calculating the final price before paying avoids surprises at checkout.
This calculator works with simple percentage discounts. It does not include sales tax (VAT/GST), shipping fees, or combined coupons; if they apply, add them after getting the discounted price. In some countries the discount is applied before or after tax: confirm the store's practice.
Frequently asked questions
Multiply the original price by the discount percentage divided by 100, then subtract that from the original price. Example: $100 with 20% off = $100 − ($100 × 0.20) = $80.
Subtract the final price from the original, divide by the original, and multiply by 100. Example: from $100 to $75 → (100 − 75)/100 × 100 = 25%.
Divide the final price by (1 − percentage/100). Example: a final price of $80 with 20% off → $80 / 0.80 = $100 was the original price.
No. Successive discounts multiply: 0.80 × 0.90 = 0.72, meaning a 28% total discount, not 30%.
It depends on the store. In many countries the discount is calculated on the pre-tax price and then sales tax is added. Confirm the store's practice to compare final prices.
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