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TinyBizTools

Percentage Off Calculator

Calculate the sale price after a percentage discount instantly. Find the discount % from two prices. Free percentage off calculator.

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Ready to calculate

Enter a price and discount above to see the final price and savings.

Common Discounts on $100.00

10% off

$90.00

save $10.00

15% off

$85.00

save $15.00

20% off

$80.00

save $20.00

25% off

$75.00

save $25.00

30% off

$70.00

save $30.00

40% off

$60.00

save $40.00

50% off

$50.00

save $50.00

75% off

$25.00

save $75.00

How to Use This Percentage Off Calculator

Discount % → Price mode:

  1. Enter the original price
  2. Enter the discount percentage
  3. See the final price and amount saved instantly

Find Discount % mode:

  1. Enter the original price
  2. Enter the final (sale) price
  3. See what percentage discount was applied

How to Calculate Percentage Off

Discount Amount = Original Price × (Discount% ÷ 100)
Final Price = Original Price − Discount Amount

Or, in one step:

Final Price = Original Price × (1 − Discount% ÷ 100)

Example: 30% off a $79.99 item:

  • Discount = $79.99 × 0.30 = $24.00
  • Final Price = $79.99 − $24.00 = $55.99
  • Or directly: $79.99 × 0.70 = $55.99

Double Discounts — Why 20% + 10% ≠ 30%

This is one of the most common misconceptions in retail pricing:

AppliedMathEffective Discount
20% off$100 → $8020%
Then 10% off $80$80 → $7228% total (not 30%)
30% off in one step$100 → $7030%

Stacked discounts compound — each one applies to the already-reduced price. This is always less than the sum of the individual discounts.

Frequently Asked Questions

How do I calculate 20% off?
Multiply the original price by 0.20 to get the discount amount, then subtract from the original price. Example: 20% off $85 = $85 × 0.20 = $17 discount → $85 − $17 = $68 final price. Or simply multiply $85 × 0.80 = $68 directly.
Use reverse mode: enter the original and final price, and the calculator will tell you the discount %. If you only know the sale price and discount %, the formula is: Original Price = Sale Price ÷ (1 − Discount% ÷ 100). Example: $68 at 20% off → Original = $68 ÷ 0.80 = $85.
No — stacked discounts compound, not add. 20% off followed by 10% off is NOT 30% off. It's: take 20% off (×0.80), then take 10% off that (×0.90) = ×0.72 = 28% total discount, not 30%. Each discount applies to the already-reduced price.
Discount % = ((Original Price − Sale Price) ÷ Original Price) × 100. Example: was $120, now $90 → ($120−$90)÷$120 × 100 = 25% off. Use the "Find Discount %" mode in this calculator for a quick answer.

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