Discount Calculator — % Off, Markdown & Half-Price in One Click
Enter the price and discount rate (%) to get the discount amount, final price, and rounding — free, no sign-up. Also explains why stacked discounts multiply, not add.
Result
| Original price | ¥ {{ fmt(result.original) }} |
| Discount | − ¥ {{ fmt(result.discountAmount) }} |
| Final price | ¥ {{ fmt(result.finalPrice) }} |
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Tips
- "20% off" and "pay 80% of the price" mean the same thing.
- Stacked discounts are multiplicative, not additive. 10% off then 5% off = 0.9 × 0.95 = 85.5% of original (14.5% total off).
- Applying the discount to the tax-inclusive price vs. the tax-exclusive price can yield different final amounts.
- Fractions are rounded to the nearest whole number.
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FAQ
Stacked discounts are multiplied, not added. For example, 10% off followed by 5% off equals 0.9 × 0.95 = 14.5% total off, not 15%.
Both the discount amount and final price are rounded to the nearest whole number. Actual stores may round down or up differently.
It depends on the store's policy. Sale prices are often based on pre-tax amounts, so check whether tax is added after the discount is applied.
Note — The Illusion That "One Free" Beats "Half Price"
Behavioral economics research shows that "50% off" and "get the same amount free" are mathematically identical in value, yet most people perceive the latter as a better deal. Campaign experiments consistently show that bonus-item offers drive more sales.
Anchoring, loss aversion, and price-point framing mean human price perception operates far from pure mathematics. Use this discount calculator to see the actual value clearly.
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