Question 1

How do stacked discounts work?

Accepted Answer

They multiply rather than add. 30% off followed by another 20% off is not 50% off — it is 0.7 × 0.8 = 0.56 of the original, so 44% off. A fixed amount taken after a percentage behaves differently again, which is why this calculator applies them in order.

Question 2

What does 8折 mean?

Accepted Answer

Chinese retail quotes the fraction you pay, not the discount. 8折 means you pay 80% — a 20% discount. 8.5折 is 15% off. The calculator shows both notations so you can compare offers across markets.

Question 3

How do I find the discount from a sale price?

Accepted Answer

Use the From sale price mode: enter the original and the sale price and it works out the percentage. Useful for checking whether an advertised discount is what it claims to be.