Discount Calculator
Enter a price and discount percentage to find the sale price and amount saved — or enter the original and sale price to find the discount percentage. Results update as you type.
All calculations run in your browser — nothing is sent to a server or stored. Results are rounded to two decimal places.
How to Calculate a Percentage Discount
A percentage discount reduces a price by a fixed proportion. The formula has two steps: first find the amount saved, then subtract it from the original price.
Amount saved = original price × (discount % ÷ 100)
Final (sale) price = original price − amount saved
For example, a $120 jacket at 25% off: saved = $120 × 0.25 = $30, so you pay $120 − $30 = $90. The "Apply discount" mode above handles both steps and shows you the breakdown.
How to Find the Discount Percentage Between Two Prices
If you know the original price and the sale price but want to know how big the discount actually is, the formula is:
Discount % = ((original − sale) ÷ original) × 100
A product that dropped from $200 to $150 saved you $50, and $50 ÷ $200 × 100 = 25% off. Switch the calculator to "Find discount %" and enter both prices — it also guards against dividing by zero if you accidentally leave the original price blank.
Worked Examples
- 10% off $45: saved = $4.50, sale price = $40.50.
- 30% off £299 (electronics sale): saved = £89.70, sale price = £209.30.
- Original €80, sale €56: saved = €24, discount = (24 ÷ 80) × 100 = 30%.
- Black Friday: was $180, now $99: saved = $81, discount = (81 ÷ 180) × 100 = 45%.
Stacking Discounts — the Mistake Most People Make
Two separate discounts do not simply add up. If a store offers 20% off and you also have a 10% loyalty code, the combined saving is not 30%.
What actually happens: $100 → 20% off = $80 → 10% off $80 = $72. Total saved: $28, or 28% — not 30%. Each discount applies to the already-reduced price, so the second discount is worth less in dollar terms than you might expect. To find the true combined rate, apply each discount in sequence using this calculator (or note that (1 − 0.20) × (1 − 0.10) = 0.72, meaning you pay 72% of the original).
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Frequently Asked Questions
How do I calculate a percentage discount?
Multiply the original price by the discount percentage and divide by 100 to get the amount saved, then subtract from the original price. For example, 20% off $80: $80 × 20 / 100 = $16 saved, so the sale price is $80 − $16 = $64. The "Apply discount" mode does this instantly.
How do I find the discount percentage between two prices?
Subtract the sale price from the original price to get the amount saved, then divide by the original price and multiply by 100. Example: original $120, sale price $90 — saved $30, discount = (30 / 120) × 100 = 25%. Use the "Find discount %" mode and enter both prices.
What does '% off' actually mean?
It means that many cents per dollar (or pence per pound) are removed from the price. "30% off" means you pay 70% of the original. A $50 item at 30% off costs $50 × 0.70 = $35.
Can I stack two discounts?
Stacking discounts is not additive — two 20% discounts do not equal 40% off. You apply the first discount to get an intermediate price, then apply the second to that. $100 at 20% off = $80; then 20% off $80 = $64. Total effective discount: 36%, not 40%. To find the combined rate, use this calculator twice or use the formula: 1 − (1 − d1)(1 − d2).
Is the discount calculator free?
Yes, completely free. There is no sign-up, no account, and no limit on how many times you can use it. The calculations run in your browser — nothing is sent to our servers.