How the discount is calculated
A percentage discount reduces the regular price by that share of itself; what you save is the same share expressed as an amount.
- Price — the regular price before discount
- Discount — the discount percentage
More detail
Stacking two discounts
Two discounts don't add together — they multiply. A 20% off price that then gets another 10% off is 20% + 10% × (1 − 20%) = 28% off total, not 30%, because the second discount applies to the already-reduced price.
Quick check. A 50% discount always halves the price, and a 25% discount removes a quarter — useful landmarks for eyeballing whether this calculator's result looks right.
Frequently asked questions
How do I find the original price from a discounted price?
Divide the discounted price by (1 − Discount ÷ 100). For example, if an item costs 40,000 after a 20% discount, the regular price was 40,000 ÷ 0.8 = 50,000.
Why don't two discounts add up the way I'd expect?
Because the second discount applies to the already-reduced price, not the original one. Stacking 20% and 10% gives a combined discount of 1 − (0.8 × 0.9) = 28%, not 30% — see the "Stacking two discounts" section above for the full breakdown.
Does this include sales tax?
No — this calculator applies a straight percentage discount to the price you enter. If tax is added after the discount, calculate the discounted price here first, then apply tax separately on that amount.