Discount Percentage Calculator
Result
| Discount | ||
|---|---|---|
| You Save |
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Discount Calculator — Know Exactly What You're Saving
"Extra 15% off already-reduced items" — but reduced from what, and what does it actually cost now? This free discount calculator answers every version of the question: percentage off → sale price, two prices → discount percentage, sale price → original price, and correctly stacked multi-coupon totals. Instant, in-browser, no signup.
The Four Discount Calculations
Sale price = original × (1 − d)
Discount % = (original − sale) ÷ original × 100
Original price = sale ÷ (1 − d)
Stacked = original × (1 − d1) × (1 − d2) ...Stacked Discounts: Where Shoppers Get Fooled
Retail loves "40% off + extra 25% off" because it feels like 65%. It isn't. Each discount applies to the running total: $200 × 0.60 × 0.75 = $90 — a true discount of 55%. The table below shows how advertised stacks compare to reality:
| Advertised stack | Feels like | Actual discount |
|---|---|---|
| 20% + 10% | 30% | 28% |
| 30% + 20% | 50% | 44% |
| 40% + 25% | 65% | 55% |
| 50% + 50% | 100% | 75% |
Smart-Shopper Checks
- Verify the "original" price — inflated pre-sale anchors are common; a price-history check tells you if 40% off is really 10% off the typical price.
- Compare per-unit cost — a 25%-off large size can still cost more per ounce than the small size on a different promotion.
- Mind the threshold math — "$20 off $100" is at best 20%, and adding items to reach the threshold usually erases the saving.
For Sellers: Discounting Without Bleeding
Discounts come straight out of margin. A product with a 40% margin that goes 20% off surrenders half its profit; at 30% off it's nearly break-even. Before running a promotion, compute the discounted price here, then check what margin survives — and remember that a price ending just below a fee threshold (like $9.99 on marketplaces with tiered referral fees) can make a discount partially self-funding.
Free and Instant
Every calculation runs live in your browser — no account, no limits. Keep it open during every sale season.