Discount Calculator

Calculate the sale price after a discount, how much you save, and the final price with sales tax included.

Original price$

Discount%

Sales tax (optional)%

Sale price

$80.00

Last updated: 2026-08-30

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FAQ

How do I calculate a discounted price?

Multiply the original price by (1 − discount% ÷ 100). For a 20% discount: price × 0.80.

How do double discounts work?

Apply them sequentially, not additively: a 20% discount followed by another 10% off equals price × 0.8 × 0.9 = 28% total off, not 30%.

How do I calculate a sale price quickly?

Multiply the price by (1 − discount). An $80 shirt at 25% off is 80 × 0.75 = $60 — no subtraction needed.

Calculate percentages three ways: what is X% of Y, X is what percent of Y, and Y increased or decreased by X%.

Calculate the percentage increase or decrease between two values, with the absolute difference and direction.

Find the percentage difference between two values relative to their average — the symmetric comparison used in science and engineering.

Add sales tax to a price, or reverse-calculate the pre-tax price and tax amount from a tax-inclusive total.