Calculate a sale price and savings, apply fixed or sequential discounts, find a discount percentage, or recover an original price. Quantity and simple tax after discount are optional.
Multiply the original total by the discount percentage divided by 100 to find savings, then subtract savings from the original total.
Sequential discounts apply one after another. A second percentage uses the already-discounted amount, so percentages should not simply be added.
savings = original total × (discount ÷ 100); sale price = original total − savingseffective discount = 1 − (1 − r₁)(1 − r₂)…discount % = (original − sale) ÷ original × 100original = sale ÷ (1 − discount ÷ 100)tax = discounted subtotal × tax rate; final = discounted subtotal + tax$100 with 25% off saves $25 and costs $75.
$100 with 20% off then 10% off becomes $80 then $72, saving $28 for an effective 28% discount.
An $80 original price and $60 sale price represent $20 savings and a 25% discount.
A $75 sale price after 25% off corresponds to a $100 original price.
A $20 fixed purchase discount on $80 costs $60, an effective 25% savings.
$100 with 20% off leaves $80; 10% tax adds $8 for an $88 final total.
Choose whether a fixed coupon applies once to the purchase or separately to every identical item.
Sequential percentage discounts use the running amount and can differ from a single combined-looking rate.
This calculator applies one optional tax after discount. Jurisdiction and promotion rules vary; use the taxable subtotal from your receipt when accuracy matters.
After 20% off, only 80% remains. Taking 10% from that remainder leaves 72%, making the effective discount 28%.
Purchase scope subtracts the fixed amount once. Per-item scope multiplies it by quantity, and validation prevents a negative result.
Forward modes multiply unit price by quantity and report both totals and discounted per-item values.
Reverse modes use direct algebra. A 100% discount cannot reveal an original price because division by zero would be required.
Multiply the original amount by the rate divided by 100, then subtract the savings.
Multiply the original amount by 0.20 for savings; 80% remains.
Multiply by 0.25 for savings; 75% remains.
Subtract the discount amount from the original total.
Subtract the sale price from the original price.
Apply each percentage to the running price in order.
No. Sequential 20% and 10% discounts equal 28% overall.
Divide savings by the original price and multiply by 100.
Divide sale price by one minus the decimal discount rate.
Choose whether the amount applies once to the purchase or once per item.
Enter the unit price and whole-number quantity.
This calculator applies tax after discount as an arithmetic convention. Actual treatment varies.
Yes. The discounted subtotal and final taxed total are divided by quantity.