Stacked discounts multiply rather than add. A 30% discount followed by an extra 10% off gives 100 × 0.7 × 0.9 = 63, saving 37% — not 40%.
Enter the original price and the final sale price, and the calculator will tell you the exact discount rate. For example, original $100, sale $70 → 30% off.
Use it for a flat coupon or loyalty points applied after the percentage discount. The fixed amount is subtracted from the already-discounted price.