Percent off calculator

What is a percent off calculator?

A percent off calculator turns a “25% off” sign into real numbers. You type in the original price and the discount percentage, and it instantly shows two things: how much money you save and what the final price will be at the register. It removes the mental math from sales, coupons, and clearance racks so you always know the true cost before you buy.

How does the calculator work?

The discount is a slice of the original price. The amount you save is that slice, and the final price is whatever is left after it is taken off:

The two results always add back up to the original price: whatever you save plus whatever you pay equals what the item cost before the discount. The calculator keeps the percentage between 0% and 100% and assumes a non-negative starting price.

Worked examples

1. $80 at 25% off. A quarter of the price comes off. $\text{Amount saved} = 80 \times \frac{25}{100} = \$20$ $\text{Final price} = 80 \times \left(1 - \frac{25}{100}\right) = \$60$ You save $20 and pay $60.

2. $120 at 10% off. A tenth of the price comes off. $\text{Amount saved} = 120 \times \frac{10}{100} = \$12$ $\text{Final price} = 120 \times \left(1 - \frac{10}{100}\right) = \$108$ You save $12 and pay $108.

3. $50 at 50% off. Half of the price comes off. $\text{Amount saved} = 50 \times \frac{50}{100} = \$25$ $\text{Final price} = 50 \times \left(1 - \frac{50}{100}\right) = \$25$ You save $25 and pay $25 — exactly half price.

Practical notes

• A 0% discount leaves the price unchanged, and a 100% discount makes the item free.
• The amount saved and the final price always sum to the original price, which is a quick way to sanity-check a deal.
• Discounts do not include sales tax. If tax applies, it is usually added to the final price after the percent off is taken.
• For stacked offers (for example, an extra 10% off an already reduced price), apply each discount one after another rather than adding the percentages together.

FAQ

How do I calculate the price after a percent off?

Multiply the original price by 1 minus the discount written as a decimal. For example, 25% off means multiply by 1 − 0.25 = 0.75, so an $80 item becomes $60.

How much do I save with a percent off?

Multiply the original price by the discount written as a decimal. A 25% discount on $80 saves 80 × 0.25 = \$20.

Does a 50% discount mean I pay half?

Yes. At 50% off you save half of the original price and pay the other half, so a $50 item costs $25.

Can I stack two percent off discounts by adding them?

No. Two 10% discounts are not the same as 20% off. Apply them in sequence: take 10% off, then take another 10% off the reduced price.