Useful when a store shows only the sale price and the discount — find out what it originally cost.
How it works
- Pick a mode: calculate the sale price from a discount, reverse-engineer the original price, or find the discount % from two prices.
- Type your numbers — everything updates live, no button needed. Use the quick buttons for common discounts (10/20/30/50%).
- Read your results: the big card shows the headline number, with savings and the full breakdown beside it.
- Compare deals: switch modes to sanity-check "was $X, now $Y" claims — if the math doesn't match the advertised %, keep shopping.
Frequently Asked Questions
What is a discount?
A discount is a reduction from the original (list) price, expressed as a percentage. A 25% discount on a $100 item means you pay $75 and save $25. Stores use discounts to clear stock, attract buyers, and compete on price.
How do I reverse-calculate the original price?
If you know the sale price (S) and the discount % (d), the original price = S ÷ (1 − d/100). For example, a $75 sale price at 25% off means the original was $75 ÷ 0.75 = $100. Use the "Sale price → Original" mode above and it does this instantly.
How do I find the discount percentage from two prices?
Discount % = (original − sale) ÷ original × 100. A $100 item selling for $75 is (100−75) ÷ 100 × 100 = 25% off. The "Find discount %" mode does this for you.
Do discounts stack (e.g., 20% + 10%)?
Not by adding: 20% then 10% off $100 = $100 × 0.8 × 0.9 = $72 (a 28% total discount), not 30% off ($70). Discounts apply sequentially to the running price, which is why stacked coupons feel smaller than they sound.
Are the results exact?
Yes for the math shown — results are rounded to the cent. Real checkout totals may add sales tax or shipping, which this calculator doesn't include.