How to Use the Discount Rate Calculator
When you see a sale price but want to know the exact discount percentage, or when you want to verify whether a store's advertised discount is accurate, this tool gives you instant results. Simply enter the original price and the sale price, and the calculator will reverse-calculate the true discount rate, how much you save, and what fraction of the original price you are actually paying.
The discount rate formula is: (Original − Sale) ÷ Original × 100. For example, an item originally priced at $80 on sale for $56 gives a discount of (80−56)÷80×100 = 30%. Small differences from advertised discounts are typically due to rounding.
Frequently Asked Questions
It depends on what you want to compare. For most shopping scenarios, enter the prices as shown — with or without tax consistently for both fields.
Yes. Enter the price after all discounts as the sale price, and the original list price as the original price, to get the combined discount percentage.
It shows how much of the original price you're actually paying. A 30% discount means you pay 70% of the original price.