Discount Calculator
Calculate a discounted price, recover the original price before a discount, find the percentage applied, or apply several discounts one after another.
Formula and method
Discounted price: original × (1 − percent ÷ 100).
Original price: final ÷ (1 − percent ÷ 100). Undefined at exactly 100%.
Discount percentage: ((original − final) ÷ original) × 100.
Stacked discounts are applied in sequence, each to the running price, so they never simply add up.
Worked example
A supplier lists an item at €100 and offers 20%, then a further 10% for settlement within 7 days.
First: €100 − 20% = €80. Then: €80 − 10% = €72.
The effective discount is (100 − 72) ÷ 100 = 28%, not 30%.
FAQ
Frequently asked questions
How do I calculate a discounted price?
Multiply the original price by the discount percentage to get the reduction, then subtract it. €100 with 20% off is €100 − €20 = €80.
How do I find the original price from a discounted price?
Divide the discounted price by (1 − discount ÷ 100). €80 after a 20% discount came from €80 ÷ 0.8 = €100.
Do stacked discounts add together?
No. Successive discounts apply to the reduced price each time. 20% then 10% off €100 gives €72, an effective discount of 28%, not 30%.
Why can't a 100% discount be reversed?
A 100% discount leaves a final price of zero, and any original price would produce the same result, so the original figure cannot be recovered.
Does this calculator include VAT?
No. Enter prices on a consistent basis — either all including VAT or all excluding it. Use the VAT calculator to move between the two.
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