Discount Calculator - Free Online Sale Price & Percentage Off Tool

How to Use This Free Retail Math Tool

Enter the original price and the discount percentage - the sale price is calculated.
Or enter the original and sale prices to find the discount percentage.
Or enter the sale price and the discount percentage to find the original price.
All three fields inter-calculate - update any two to compute the third.

Discount Calculator helps you calculate sale prices and percentage off deals instantly, making it the perfect companion for retail shopping or budget planning. Whether you are browsing a clearance rack or evaluating a coupon code, this tool provides quick answers for savings, markdown amounts, and final costs after taxes (if applicable).

Understanding Percentage Off and Sale Prices

Retailers don't always make it easy to verify whether a "40% off" label is accurate. If the original price is £80 and the sale price is £52, the actual discount is (80 − 52) / 80 = 35%, not 40%. Enter the two prices and the tool calculates the real percentage. Conversely, to find what "25% off £149.99" becomes, enter the original and percentage and read the discounted price.

Three calculation modes: find sale price, find discount %, or find original price
Shows savings amount alongside the percentage
Handles compound discounts: stack multiple percentages (e.g. 20% off, then an extra 10%)
Works with any currency - inputs are plain numbers

Frequently Asked Questions

What is the formula for discount percentage?

Discount % = ((Original − Sale) ÷ Original) × 100. For example: original £100, sale £75 → ((100−75)/100) × 100 = 25%.

How do I find the original price from a sale price and discount?

Original = Sale ÷ (1 − discount%). If an item is £60 after a 25% discount: Original = 60 ÷ 0.75 = £80.

What is a compound discount?

Two successive discounts of 20% and 10% are not the same as a single 30% discount. On a £100 item: 20% off = £80, then 10% off £80 = £72. Single 30% off = £70. The compound discount gives 28% off, not 30%.

What is the difference between a markdown and a discount?

In retail: a discount is a reduction from a price (may be temporary). A markdown is a permanent price reduction, often used when clearing inventory. Both calculate the same way - original price minus new price.

Bookmark this page for your next shopping trip to ensure you always have a fast and accurate Discount Calculator.

Discount Calculator online

Calculate sale prices, discount amounts, and original prices