How to calculate discount
Sale price = Price × (1 − d₁) × (1 − d₂)
Worked example. Sale price: $60.00.
Example inputs — Original price: $80.00; Discount: 25%; Extra discount (stacked): 0%. Starting values are illustrative.
From George Guju, founder of Calculyn · Educational calculator guidance, not professional advice.
How it works
Multiply the price by (1 − discount). Stacked discounts apply one after another, so 20% + 10% off is 28% off, not 30%.
Assumptions & limitations
- Results are rounded for display.
Formula and assumptions reviewed October 2026 by the Calculyn team. How we build our calculators
Frequently asked questions
Is 50% + 50% off free?
No. Stacked, it's 75% off: half of half.