Discount Calculator

The Discount Calculator works out the final sale price, the amount you save, and the effective discount percentage for any combination of original price and markdown, instantly updating as you adjust either the price or the percentage off. Enter an original price and a discount percentage and it computes the sale price and savings in cents; enter an original price and a sale price instead and it works backward to tell you exactly what percentage discount that represents. Shoppers use this constantly during sales events — figuring out whether a "40% off" sticker actually beats a competing store's flat-dollar discount, stacking a percentage-off coupon on top of an already-marked-down item, or double-checking a cashier's discount calculation before completing a purchase. It's especially useful for comparing deals that are advertised in different formats: one retailer might advertise "$25 off," another "20% off," and without a quick calculation it's genuinely hard to tell which is the better deal on a specific item without knowing the original price. Retail and small-business owners use the reverse calculation constantly when setting sale prices: deciding to mark an item down by exactly 30% for a clearance event and needing to know the resulting price to the cent so it can be entered into a point-of-sale system or printed on a shelf tag. Freelancers and consultants sometimes use the same math to calculate an early-payment or loyalty discount they're offering a client, making sure the final invoiced amount is calculated correctly. The core formula is simple but easy to fumble under time pressure: sale price equals original price multiplied by (1 minus the discount as a decimal). So a $80 item at 25% off is 80 × (1 − 0.25) = 80 × 0.75 = $60, a $20 savings. A frequent point of confusion arises with stacked discounts: two consecutive 20% discounts do not add up to 40% off. The first 20% off brings a $100 item to $80; the second 20% off is then taken from $80, not from the original $100, bringing it to $64 — a total discount of 36%, not 40%. This calculator handles that correctly by applying discounts sequentially rather than simply adding percentages together, which is exactly the mistake many shoppers make when mentally stacking a store discount with a coupon code. Another practical tip: when comparing a percentage discount against a flat-dollar discount, convert both to the same unit before deciding. "$15 off a $50 item" is a 30% discount, which might beat a competing "25% off" offer on the identical item — but only a quick calculation reveals that, since the two are advertised in incompatible units. All computation happens instantly and privately in your browser with no data sent anywhere, so it's just as suitable for personal budgeting as for setting confidential wholesale pricing. Pair it with the Percentage Calculator for more general percentage math, and the Tip Calculator when splitting a bill that also includes a discount.