Discount Calculator (How much is X% off?)
＋More features: stacked discounts and coupon comparison
Stacked discounts (an extra X% off)
Calculates the final price of a double discount such as “30% off, then an extra 20% off at the register”.
Which saves more: “X yen off” or “X% off”?
When you can choose between two coupons, this compares which one makes your payment lower.
Instantly find out what you actually pay when something is “30% off”. It also works backwards: enter the list price and the sale price to see what percentage was taken off. Handy for sale-season shopping in Japan.
How to use
- Choose “Price after X% off” or “Work back the discount rate”.
- Enter the list price and the discount rate (or the sale price).
- The discounted price and the amount saved (or the discount rate) appear as you type — no button needed.
How it is calculated
- Discounted price = list price × (1 − discount rate ÷ 100) (rounded to the nearest yen)
- Discount rate = (1 − sale price ÷ list price) × 100
- Example: 30% off 2,980 yen → 2,980 × 0.7 = 2,086 yen (894 yen saved)
- On Japanese price tags, “2割引” (2-wari-biki) means 20% off and “半額” (hangaku) means half price, i.e. 50% off.
Sources and assumptions
- This is an arithmetic calculation based on the price and the discount rate.
Assumptions and notes
- Some shops round fractions down or up instead, so the register total may differ by a yen or so.
- For stacked discounts such as “an extra 20% off the displayed price”, use this tool in two steps (30% off plus 20% off is not 50% off).
Frequently asked questions
Is “30% off, then an extra 20% off” the same as 50% off?
No. The discounts apply one after another: 0.7 × 0.8 = 0.56, which is equivalent to 44% off. A 1,000-yen item becomes 560 yen. You can confirm this by running the tool twice.
Should I calculate on the tax-included or tax-excluded price?
A discount normally applies to the displayed price (in Japan, usually tax-included). The rate is applied directly to whatever amount you enter as the list price.
Which saves more, a discount or point rewards?
At the same percentage, the discount saves you more, because with points you still pay the full price first and the points only count when you use them later.