CalcLibrary

Discount Calculator

Calculate the final price after a discount. Choose between a percent-off discount or a fixed-amount discount, and see your savings and the effective discount percent.

Currency
$
Examples

A standard percent-off promotion on a $100 item.

Final Price
$80.00
You Save
$20.00
Effective Discount
20%

You save 20.0% off the original price.

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Examples

How It Works

Formula

Final%=Price×(1−Discount100)\text{Final}_{\%} = \text{Price} \times \left(1 - \dfrac{\text{Discount}}{100}\right)

\text{Final}_{$} = \max(0,, \text{Price} - \text{Discount})

Savings=Price−Final\text{Savings} = \text{Price} - \text{Final}

Effective %=SavingsPrice×100\text{Effective }\% = \dfrac{\text{Savings}}{\text{Price}} \times 100

Variables

Price\text{Price}

Original price before any discount

Discount\text{Discount}

Percent off (in percent mode) or currency amount (in fixed-amount mode)

Final\text{Final}

Price after the discount is applied

Savings\text{Savings}

Original price minus final price

Enter the original price and pick a discount type. In percent mode, the calculator multiplies the price by (1 − percent/100). In fixed-amount mode, it subtracts the discount from the price (capped so the result never goes negative). Either way, you see the final price, the total savings, and what percent off the savings represent.

Frequently Asked Questions

01How do I calculate a percent discount?
Multiply the original price by (1 − discount/100). For example, 20% off \$100 = \$100 × 0.80 = \$80. The savings is the original price minus the final price: \$100 − \$80 = \$20.
02What is the difference between a percent discount and a fixed-amount discount?
A percent discount reduces the price by a share of itself, so the savings scale with the price (20% off $50 = $10, 20% off $500 = $100). A fixed-amount discount subtracts the same currency amount regardless of the price ($15 off is always $15 off, but it represents a larger share of a cheaper item).
03Is sales tax applied before or after the discount?
This calculator only discounts the price you enter. If you need tax included, apply your preferred tax step separately to the discounted price.
04How do I stack two discounts?
Stacked percent discounts compound, they do not add up. Two consecutive 20%-off discounts give 0.80 × 0.80 = 0.64 of the original price — a 36% effective discount, not 40%. To stack with this calculator, run it twice: take the result of the first discount as the input price for the second.
05What does "effective discount" mean?
The effective discount is the savings expressed as a percent of the original price. In percent mode it equals the input percent (clamped at 100%). In fixed-amount mode it tells you what percent off the voucher actually represents — e.g. a $15 voucher on a $60 item is a 25% effective discount.

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