To calculate a discount manually, multiply the original price by the discount percentage (as a decimal). Then, subtract this discount amount from the original price to get the final price. For example, for 25% off $100: $100 * 0.25 = $25 discount. $100 - $25 = $75 final price.

A discount percentage is the rate at which the original price of an item is reduced. It tells you what fraction of the original price you will save. For instance, a 10% discount means you save 10 cents for every dollar (or 10 pence for every pound) of the original price.

No, this calculator is specifically designed for calculating discounts (price reductions). Sales tax is an additional amount added to the price, not subtracted. For sales tax calculations, you would typically add a percentage to the original price.