Discount Calculator

Enter the original price and discount rate to instantly find the sale price, amount saved, and effective savings.

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Quick Reference

To find the discount rate from two prices: Rate = (Original − Final) / Original × 100. To find the sale price from a rate: Sale = Original × (1 − Rate / 100).

Discount Rate

Discount Rate 100 $
10%90 $
20%80 $
25%75 $
50%50 $

How to use?

  1. 1
    Enter Original PriceType the full price before any discount.
  2. 2
    Enter Discount RateEnter the percentage discount (e.g. 20 for 20% off).
  3. 3
    See Results InstantlyThe sale price, amount saved, and discount rate are calculated automatically.

FAQ

How do I calculate a discount percentage?
Discount % = (Original Price − Final Price) / Original Price × 100. For example, if something costs 80 and is now 60, the discount is (80−60)/80 × 100 = 25%.
How do I find the sale price from a percentage?
Sale Price = Original Price × (1 − Discount Rate / 100). For a 30% discount on 150: 150 × 0.70 = 105.
Can I work backwards from the sale price?
Yes. Use the second mode (Final Price → Rate). Enter the original and final prices and the calculator will tell you the exact discount percentage applied.

How to Calculate a Discount

There are two common discount calculations. (1) Finding the sale price: Sale Price = Original Price × (1 − Rate / 100). A 25% discount on 200 gives 200 × 0.75 = 150. (2) Finding the discount rate: Rate = (Original − Final) / Original × 100. If something dropped from 200 to 150, the discount is 25%.

Stacked Discounts

Two sequential discounts do not add up. A 20% then 10% discount gives a combined rate of 1 − (0.80 × 0.90) = 28%, not 30%. Always apply discounts multiplicatively, not additively.

Common Uses

Discount calculators are used in retail shopping, invoice pricing, coupon verification, salary negotiations, and wholesale purchasing to quickly determine real savings.

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