Percent Off Calculator
Calculate discount amounts and final prices. See how much you save with percent off deals, stacked discounts, and sales tax.
Original price before discount
Discount percentage
Second discount (stacks multiplicatively)
Sales tax rate (applied after discounts)
How do I calculate percent off discounts?
Formula: Discount Amount = Original Price × (Percent Off / 100), Final Price = Original Price - Discount Amount. Example: $80 item, 25% off = $80 × 0.25 = $20 discount, Final price = $60. Quick method: 25% off = multiply by 0.75 (100% - 25% = 75% of original). Common discounts: 10% off = ×0.9, 20% off = ×0.8, 30% off = ×0.7, 50% off = ×0.5.
How do multiple discounts stack?
Discounts multiply, they don't add! Example: 20% off then 30% off ≠ 50% off. Correct: $100 × 0.8 = $80, then $80 × 0.7 = $56 (44% total off, not 50%). Order doesn't matter for multiplication. "Additional 30% off sale items" calculation: If item is 40% off ($60), additional 30% = $60 × 0.7 = $42 final (58% total off original $100). Always calculate sequentially.
What is the best way to compare different discount offers?
Calculate final price for each offer. Example comparing: A) 30% off + free shipping ($10 value), B) 25% off + $15 store credit, C) Buy 2 get 1 free (= 33.3% off on 3 items). Calculate total cost after all benefits. Consider: Minimum purchase requirements, expiration dates, store credit restrictions, shipping costs, return policies. Sometimes smaller discount with better terms wins.
How do I calculate the original price from a discounted price?
Formula: Original Price = Final Price / (1 - Percent Off / 100). Example: Item is $45 after 25% off, what was original? $45 / 0.75 = $60. Useful for: Determining if "sale" is legitimate, reverse engineering discounts, comparing store pricing. Trick: If something is 60% off and costs $40, original = $40 / 0.4 = $100. Helps evaluate if deal is real or inflated original price.