Discount Computation Calculator
Compute the discount amount, sale price and total savings from any original price, with an optional extra discount and sales tax.
How to compute a discount
Discount amount = original price × discount rate. Sale price = original price − discount amount. For a second discount, apply it to the already reduced price, then add sales tax on top. Example: $120 with 25% off is $30 off, for a sale price of $90.
Frequently asked questions
How do I calculate a discount?
Multiply the original price by the discount percentage, then subtract that amount from the original price. A 25% discount on $120 saves $30, giving $90.
How do two discounts combine?
They compound rather than add. 20% off followed by an extra 10% off is 28% off in total, not 30%, because the second discount applies to the reduced price.
Is sales tax applied before or after the discount?
In most places tax is charged on the discounted price. Enter your local rate to see the final total, or leave it at 0 to ignore tax.
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