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Discount Calculator
Quickly calculate sale price, discount amount, and percentage saved for any purchase. We're building this calculator now — check back soon.
Quickly calculate sale price, discount amount, and percentage saved for any purchase. We're building this calculator now — check back soon.
This calculator quickly computes the sale price, dollar savings, and effective discount percentage for any item or purchase. Whether you're comparing sale prices, calculating the value of a coupon or promo code, figuring out bulk discount savings, or working out markdowns on your own products, this tool does the math instantly without manual percentage calculations.
You can use it three ways: enter original price and discount percentage to find sale price; enter original price and sale price to find percentage off; or work backwards from a desired price to find the required discount percentage. It also handles stacked discounts — which are different from simply adding the percentages.
The core discount formulas are:
Sale Price = Original Price × (1 − Discount % / 100)
Savings Amount = Original Price − Sale Price
Discount % = (Savings Amount / Original Price) × 100
For stacked discounts (e.g., 20% off, then additional 10% off), the combined discount is NOT simply 30%. Correct calculation: 20% off leaves 80%, then 10% off that leaves 72% of original. Combined savings is 28%, not 30%.
Percentage discounts scale with purchase price; fixed-dollar discounts do not. A 20% discount on a $50 item saves $10. "$10 off" saves the same on a $50 item but only $10 on a $200 item (vs $40 for 20% off). Always convert to the same unit for the specific item you're buying.
"Buy One Get One Free" equals a 50% discount on each item if you need both. "Buy One Get One 50% Off" equals a 25% overall discount. These are less favorable than they appear — only if you genuinely need both items does the offer represent real savings.
For retailers, a markdown reduces the retail price by a percentage of that price. Margin is profit as a percentage of the selling price. If an item costs $40 and retails for $100 (60% margin), discounting it 30% to $70 reduces margin to approximately 43%.
Multiply the original price by 0.70 (which is 1 minus 0.30). For example, 30% off $85 = $85 × 0.70 = $59.50. Or find 30% of the price ($85 × 0.30 = $25.50) and subtract from the original ($85 − $25.50 = $59.50).
No. Stacked percentage discounts multiply rather than add. 20% off leaves 80%. An additional 10% off that reduces it to 72% of the original (0.80 × 0.90 = 0.72). Total discount is 28%, not 30%.
Divide the sale price by (1 − discount percentage). If an item is $63 after a 30% discount: $63 ÷ 0.70 = $90 original price. This formula is essential for reverse-engineering sale prices.
In most US states, sales tax is applied to the final sale price after discounts. If you buy a $100 item at 20% off for $80 in a state with 8% sales tax, you pay tax on $80 ($6.40), not $100 ($8.00). Manufacturer coupons may be handled differently in some states.
For sales tax on your final purchase price, use the Sales Tax Calculator. Retailers evaluating pricing strategy will find the ROI Calculator useful for analyzing margin impact of discounts. The Savings Calculator helps model the opportunity cost of spending versus investing those dollars.