Discount Calculator
Find the sale price and what you save
Free Online Discount Calculator
Work out sale prices, savings and discount percentages in seconds
This discount calculator works in both directions. In "Apply Discount" mode you enter a price and a percentage off, and it shows the sale price along with exactly how much you save. In "Find Discount %" mode you enter the original and the sale price, and it calculates the percentage discount — the quickest way to check whether a shop's "huge sale" really is what it claims. Preset buttons for 10%, 20%, 25%, 50% and 70% are one tap away, and you can type any rate you like. Results update instantly and nothing is ever sent to a server.
Features
Sale Price
Turn a price and a percentage off into the final price and your saving.
Reverse Mode
Work out the discount percentage from the original and sale price.
Preset Rates
10%, 20%, 25%, 50% and 70% in one tap, plus free rate entry.
Private & Free
Everything runs in your browser; no data is uploaded.
Discount Formulas & Quick Table
Formulas
- Saving = Price × (Rate ÷ 100)
- Sale price = Price × (1 − Rate ÷ 100)
- Discount % = (Original − Sale) ÷ Original × 100
- Example: 100, 20% off → save 20, pay 80
Quick Look on a Price of 100
- 10% off → 90 (save 10)
- 20% off → 80 (save 20)
- 25% off → 75 (save 25)
- 50% off → 50 (save 50)
- 70% off → 30 (save 70)
The Stacked-Discount Trap
"50% off plus an extra 20%" is NOT 70% off.
- 100 × 0.50 = 50 (first discount)
- 50 × 0.80 = 40 (second discount)
- Real discount: 60%, not 70%
Frequently Asked Questions
How do I calculate 20% off a price?
Multiply the price by 0.80. For example, 20% off 100 is 100 × 0.80 = 80, and the saving is 20. In the tool, type the price and tap the 20% button.
How do I find the discount percentage?
Choose "Find Discount %" and enter the original and sale prices. The formula is (Original − Sale) ÷ Original × 100. An item cut from 100 to 75 is 25% off.
Do stacked discounts add up?
No. "50% off plus an extra 20%" is 60% off in total, not 70%, because the second discount applies to what's left after the first: 100 → 50 → 40.
How do I find the original price from a sale price?
Divide the sale price by (1 − rate). For example, an item at 80 after 20% off was originally 80 ÷ 0.80 = 100.
Is tax applied before or after the discount?
Shelf prices usually already include VAT, so the discount applies to the tax-inclusive price and the result stays tax-inclusive. To separate the net amount, use the VAT calculator.
Are the prices I enter stored?
No. All calculations run in your browser; values are only kept locally on your device for convenience.