Discount calculator
Calculate stacked discounts and an order total, recover an original price, or find the percent off between two prices.
Discount formulas
For one discount, sale price = original price × (1 − discount rate). With successive discounts, multiply the remaining-price factors: sale price = original × (1 − d₁) × (1 − d₂) × (1 − d₃).
The combined percent off is 1 − [(1 − d₁) × (1 − d₂) × (1 − d₃)]. Two successive discounts of 20% and 10% equal a 28% combined discount, not 30%.
To recover an original price, divide the sale price by the combined remaining-price factor. To find percent off from two prices, use (original − sale) ÷ original × 100%.
Example
A $100 item discounted 20% costs $80 before tax. Applying another 10% discount reduces it to $72, for an effective discount of 28% and total savings of $28.
Order calculation assumptions
- Percentage discounts are applied before the fixed coupon.
- The coupon cannot reduce merchandise below zero.
- Tax is calculated after discounts and the coupon.
- You choose whether shipping belongs in the taxable amount.
- Local tax, coupon and shipping rules vary; use the actual checkout rules.
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