Discounts, calculated.

DiscountLab

Free calculators that turn an original price and a discount into the sale price and the amount saved, with optional sales tax.

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Discount Calculator
A free discount calculator that turns an original price and a discount into the sale price and the amount you save. It handles both percent-off and fixed dollar-off discounts, reports the effective percentage either way, and can add sales tax to the discounted price for a true checkout total. It is plain arithmetic, computed in your browser — an estimate of what you will pay, not financial advice. Discounts are clamped so a price can never go below zero.

Guides for better estimates

Start with the calculator, then use these sourced guides to understand the assumptions behind it.

Is 20% off plus 10% off the same as 30% off?

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