How to Calculate a Discount
Learn how to calculate a discount amount and final sale price with a simple worked example.
Overview
Discount calculations are useful for shopping, pricing, promotions, and comparing sale offers. The key is to work out the discount amount first, then subtract it from the original price.
The formula
Discount amount = original price × discount rate. Final price = original price − discount amount.
Worked example
If a product costs £120 and the discount is 15%, the discount amount is £18. Subtract £18 from £120 and the final price is £102.
Why this calculation matters
Without the formula, people often estimate sale prices incorrectly. A quick discount calculation helps you compare offers and avoid pricing mistakes.
Quick steps
- Write down the original price.
- Convert the discount percentage into a decimal or keep it as a percentage for calculator use.
- Multiply the original price by the discount percentage.
- Subtract the discount amount from the original price.
- Check the final total.
Try the matching tool
Use the live calculator for a faster answer after reading the guide.
FAQ
Multiply the original price by 20%, then subtract that amount from the original price.
Yes. It is useful for promotions, markdowns, and clearance pricing.
A discount reduces a selling price. A markup adds profit on top of cost.
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