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Цена со скидкой и экономия, двойные скидки и налог или процент скидки между двумя ценами
Цены округляются до цента только в конце. Магазины могут округлять каждый шаг, поэтому чек может отличаться на цент.
Последнее обновление: ноябрь 4, 2026
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How to Calculate a Discount
Every discount question is one of three, and each has a one-line formula:
Sale price
Sale price = price x (1 - percent / 100). 30% off $40 is 40 x 0.70 = $28, a saving of $12.
Percent off
Percent off = (original - sale) / original x 100. From $80 down to $52 is 28 / 80 = 35% off.
Original price
Original = sale price / (1 - percent / 100). $45 after 25% off was 45 / 0.75 = $60.
A shortcut for doing it in your head: 10% is the price with the decimal point moved one place left. 10% of $64 is $6.40, so 20% is $12.80 and 30% is $19.20. Half of 10% is 5%, which gets you 15% and 25% too.
Stacked Discounts: "Extra % Off" Is Less Than It Looks
When a store takes an extra percentage off an already reduced price, the discounts multiply rather than add. On a $100 item:
| Deal | Sounds like | Real discount | You pay on $100 |
|---|---|---|---|
| 20% off + extra 10% off | 30% | 28% | $72.00 |
| 25% off + extra 15% off | 40% | 36.25% | $63.75 |
| 30% off + extra 20% off | 50% | 44% | $56.00 |
| 40% off + extra 25% off | 65% | 55% | $45.00 |
| 50% off + extra 20% off | 70% | 60% | $40.00 |
| 50% off + extra 50% off | 100% | 75% | $25.00 |
| 60% off + extra 30% off | 90% | 72% | $28.00 |
| 70% off + extra 10% off | 80% | 73% | $27.00 |
50% off plus an extra 50% off is 75% off, not free. The order of the two discounts never changes the result.
Percent-Off Table for Common Prices
The price you pay after each discount, before tax:
| Price | 10% off | 15% off | 20% off | 25% off | 30% off | 40% off | 50% off | 60% off | 70% off |
|---|---|---|---|---|---|---|---|---|---|
| $10.00 | $9.00 | $8.50 | $8.00 | $7.50 | $7.00 | $6.00 | $5.00 | $4.00 | $3.00 |
| $20.00 | $18.00 | $17.00 | $16.00 | $15.00 | $14.00 | $12.00 | $10.00 | $8.00 | $6.00 |
| $25.00 | $22.50 | $21.25 | $20.00 | $18.75 | $17.50 | $15.00 | $12.50 | $10.00 | $7.50 |
| $30.00 | $27.00 | $25.50 | $24.00 | $22.50 | $21.00 | $18.00 | $15.00 | $12.00 | $9.00 |
| $40.00 | $36.00 | $34.00 | $32.00 | $30.00 | $28.00 | $24.00 | $20.00 | $16.00 | $12.00 |
| $50.00 | $45.00 | $42.50 | $40.00 | $37.50 | $35.00 | $30.00 | $25.00 | $20.00 | $15.00 |
| $60.00 | $54.00 | $51.00 | $48.00 | $45.00 | $42.00 | $36.00 | $30.00 | $24.00 | $18.00 |
| $75.00 | $67.50 | $63.75 | $60.00 | $56.25 | $52.50 | $45.00 | $37.50 | $30.00 | $22.50 |
| $80.00 | $72.00 | $68.00 | $64.00 | $60.00 | $56.00 | $48.00 | $40.00 | $32.00 | $24.00 |
| $100.00 | $90.00 | $85.00 | $80.00 | $75.00 | $70.00 | $60.00 | $50.00 | $40.00 | $30.00 |
| $150.00 | $135.00 | $127.50 | $120.00 | $112.50 | $105.00 | $90.00 | $75.00 | $60.00 | $45.00 |
| $200.00 | $180.00 | $170.00 | $160.00 | $150.00 | $140.00 | $120.00 | $100.00 | $80.00 | $60.00 |
| $250.00 | $225.00 | $212.50 | $200.00 | $187.50 | $175.00 | $150.00 | $125.00 | $100.00 | $75.00 |
| $500.00 | $450.00 | $425.00 | $400.00 | $375.00 | $350.00 | $300.00 | $250.00 | $200.00 | $150.00 |
Sales Tax After a Discount
Add tax to the price you actually pay. With a store discount, US states generally tax the reduced price: 25% off $80 is $60, and 8.25% tax on $60 makes $64.95. Manufacturer coupons are often taxed on the price before the coupon, so the receipt can come out slightly higher than the calculator. If you do not know your rate, our sales tax calculator lists the rate for every state.
Is It Really a Deal?
A percentage is only as honest as the price it starts from. "Was" and "list" prices are sometimes set high so the discount looks bigger, so compare the sale price with what the item has actually sold for over the past few weeks. For big seasonal sales such as Black Friday, check the price a week or two before the sale too: a 40% discount on a price that went up last month may be a 10% discount in reality.
Как мы это считаем
- Метод
- Sale price = price x (1 - percent off); stacked discounts multiply; tax on the discounted price
- Формула
-
Sale price = P x (1 - d/100). Second discount: P x (1 - d1/100) x (1 - d2/100); real combined discount = 1 - (1 - d1/100)(1 - d2/100). Percent off = (original - sale) / original x 100. Original price = sale / (1 - d/100). With tax = price after discounts x (1 + t/100). Rounded to the cent only for display. - Источник
- Standard percentage arithmetic. Sales tax on the discounted price for store discounts follows general US state practice (see e.g. state department of revenue guidance on retailer coupons vs manufacturer coupons).
- Ограничения
- Stores may round each step to the cent, so a receipt can differ by a cent. Manufacturer coupons are taxed on the pre-coupon price in many states; this calculator applies tax after all discounts. It does not know an item's real price history: a percentage off an inflated "was" price is not a real saving.
- Последняя проверка
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