Discount Calculator: Sale Price, Percent Off, and Stacked Offers
In Chinese retail, 打几折 expresses the price in tenths: 8.5 折 multiplies the price by 0.85, and 7 折 by 0.7. A straight 30% off is the same as multiplying by 0.70.
Open the tool：Discount Calculator
When you need a discount calculation
Any time the sticker price is not the price you pay, the offers have to be converted to a common basis before they can be compared.
The multiplication is easy; the mistakes come from which price the offer applies to: the original, the already-discounted price, or the amount including tax and shipping.
- Comparing the same item across platforms with different coupon structures.
- Checking a bulk, staff, or tiered discount against the listed price.
- Deciding whether buying one more item to hit a threshold actually saves money.
Getting the conventions right
Convert the discount to a multiplier first. 几折 is tenths: 8.5 折 = 85% = ×0.85; 30% off = ×0.70; a flat 50 off is price minus 50. Writing it as one multiplication stops you from swapping the discount and the price.
Order matters. A 10% coupon followed by a 10% member discount is ×0.9 ×0.9 = ×0.81, not ×0.8. A threshold discount applied to the already-discounted price gives a different total from one applied to the original, so read which base the rule uses.
- Stacked discounts multiply; they never add. Two 10% discounts are 19% off in total, not 20%.
- Decide whether tax, shipping, and service fees are inside the original price before you quote how much was saved.
- A threshold discount can cost more than it saves if the extra item is something you would not have bought.
- Keep the pre-discount price for returns and warranty claims; refunds are usually based on what you actually paid.
Limits
Coupon stacking rules, platform subsidies, membership tiers, tax treatment, and clawbacks after a return are set by the seller, and a calculator cannot know them.
The result also ignores the value of free gifts, free-shipping thresholds, and your own time spent chasing the deal.
- Pre-sale deposits and cross-store promotions have to be checked against the platform's final checkout page.
- Cross-border duty and VAT change the real landed price.
FAQ
How do I convert a discount to a percentage?
几折 means tenths of the price: 8.5 折 is 85%, so multiply by 0.85. A 30% reduction is the same as paying 70%, i.e. multiply by 0.70.
How do stacked or double discounts work?
They multiply. A further 20% off an already 10%-off price is 0.9 × 0.8 = 0.72, so 28% off in total, not 30%.
Is a percentage discount or a threshold discount better?
It depends on the amount. Compute the final price for both on your actual basket; a threshold discount only wins if you were going to buy the extra item anyway.
Related tool：Discount Calculator