Discount Calculator — Three common discount problems, one tool. Use the forward mode when you know the percentage and want the final price. Use the reverse mode when you see a sale price and want to know the effective discount. Use the required-discount mode when you have a target price in mind and need to know what to mark items down to.
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Discount Calculatorとは？
Three common discount problems, one tool. Use the forward mode when you know the percentage and want the final price. Use the reverse mode when you see a sale price and want to know the effective discount. Use the required-discount mode when you have a target price in mind and need to know what to mark items down to.
Useful for shopping comparisons, retail pricing decisions, sale advertising, and the everyday "is this deal actually a good deal?" check.
使い方
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Pick a mode
Forward (X% off), reverse (what % off), or required (hit a target price).
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Enter the numbers
Original price + the other input. All values update as you type.
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Read the result
Final price, amount saved, and effective percentage.
使用例
25% off a $80 jacket
Forward mode.
結果： $60.00 final, $20.00 saved
$75 on sale from $100
Reverse mode.
結果： 25% off
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Last reviewed: 2026-09-25