Discount Calculator

Enter a price and discount to calculate the final sale price and amount saved. You can also subtract a fixed amount, find an original price from a discounted price, or combine two percentage discounts to see the true overall reduction.

Discount type

Original price

Discount(%)

Price after discount

Original price: 100
You save: 20
Discount: 20%

Enter amounts in any currency. The calculator uses the numbers as entered and does not perform currency conversion.

How to Use the Discount Calculator

Choose a calculation from the Discount type menu, then enter the price and discount values. The result updates automatically as you type.

Percent off calculates a normal percentage sale. Amount off subtracts a fixed value. Find original price works backward from a known sale price, while Stacked discounts applies two percentage reductions in sequence.

Amounts are currency-neutral. You can enter dollars, pounds, euros, rupees, or another currency as long as all monetary values in the calculation use the same currency.

How Percentage Discounts Work

A percentage discount removes a fraction of the original price. A 20% discount means that 20% of the original price is saved and the remaining 80% is paid.

For an original price of 100, a 20% discount saves 20 and leaves a sale price of 80. For a price of 250, the same 20% discount saves 50 and leaves 200.

You can calculate the final price directly by multiplying the original price by the percentage that remains. For 20% off, multiply by 0.80. For 35% off, multiply by 0.65.

**Common percentage discounts**The multiplier is the proportion of the original price that remains after the discount.
Discount	Price multiplier	Final price from 100
5%	0.95	95
10%	0.90	90
15%	0.85	85
20%	0.80	80
25%	0.75	75
30%	0.70	70
40%	0.60	60
50%	0.50	50
60%	0.40	40
75%	0.25	25

Discount Percentage and Amount Saved

The discount percentage describes the reduction relative to the original price. The amount saved is the actual difference between the original and final prices.

The same percentage can therefore represent very different monetary savings. A 20% discount saves 10 on a price of 50, 40 on a price of 200, and 200 on a price of 1,000.

The reverse is also true for fixed discounts. Saving 20 on an original price of 100 is a 20% reduction, while saving the same 20 on a price of 500 is only a 4% reduction.

Fixed Amount Discounts

A fixed discount subtracts a specific amount instead of a percentage. If an item costs 120 and the offer gives 25 off, the final price is 95.

Its effective discount percentage depends on the original price. A fixed reduction of 25 from 100 is equivalent to 25% off, while 25 off 200 is equivalent to 12.5% off.

A fixed discount cannot exceed the original price in this calculator because that would produce a negative final price.

How to Find the Original Price Before a Discount

If you know the sale price and discount percentage, the original price can be recovered by dividing the sale price by the fraction of the price that remained.

For example, a 20% discount leaves 80% of the original price. If the final price is 80, divide 80 by 0.80 to get an original price of 100.

This is different from simply adding 20% to the sale price. Adding 20% to 80 gives 96, not 100, because the original discount was calculated from a different base amount.

A 100% discount cannot be reversed. If the final price is zero, the original price cannot be determined from the discounted price alone.

How Stacked Discounts Work

Stacked discounts are applied one after another. The second percentage applies to the price left after the first discount, not to the original price.

For example, 20% off 100 leaves 80. A second discount of 10% removes 8 from that remaining price, leaving 72. The total saving is 28, so the effective discount is 28%, not 30%.

Two percentage discounts can be combined using their remaining-price multipliers. For 20% and 10%, multiply 0.80 by 0.90 to get 0.72. That means 72% of the original price remains and 28% has been discounted.

**Examples of stacked percentage discounts**Effective discount is the total reduction from the original price after both discounts are applied.
First discount	Second discount	Effective discount	Price remaining
10%	10%	19%	81%
20%	10%	28%	72%
20%	20%	36%	64%
25%	10%	32.5%	67.5%
30%	20%	44%	56%
40%	20%	52%	48%
50%	50%	75%	25%

Does the Order of Stacked Discounts Matter?

For percentage-only discounts, changing their order does not change the final price. A 20% discount followed by 10% gives the same result as 10% followed by 20% because multiplication is commutative.

Starting from 100, either order produces a final price of 72 and an effective discount of 28%.

This rule does not automatically apply when a promotion mixes percentages with fixed amounts, taxes, minimum-spend conditions, coupons, or other pricing rules. In those cases, the order of operations can matter.

Why Two 50% Discounts Are Not 100% Off

The second 50% discount applies only to the price that remains after the first one.

Starting from 100, the first 50% discount reduces the price to 50. Taking 50% off that remaining 50 removes another 25, leaving a final price of 25.

The combined saving is therefore 75% of the original price, not 100%.

Discounts, Sales Tax, and VAT

This calculator handles the discount itself. It does not automatically add sales tax, VAT, shipping, fees, or other charges.

The amount actually charged at checkout can therefore differ from the displayed discounted price when additional taxes or fees apply.

If you need to calculate tax separately, use the Sales Tax Calculator after determining the price to which the tax should apply.

Common Discount Calculation Mistakes

Adding stacked percentages: 20% off followed by 10% off is 28% off overall, not 30%.

Adding the discount back to reverse it: A 20% discount cannot be undone by adding 20% to the sale price because the two percentages use different base values.

Confusing the final price with the saving: 25% off 200 saves 50, while the final price is 150.

Treating a fixed reduction as the same percentage everywhere: 20 off has a different effective percentage on a 50 purchase than on a 500 purchase.

Mixing currencies: All monetary amounts entered in one calculation should use the same currency.

Discount Formulas

These formulas cover percentage discounts, fixed savings, reverse discounts, and two sequential percentage discounts.

Discount amount

S = P_{o} \frac{d}{100}

Sale price

P_{f} = P_{o} (1 - \frac{d}{100})

Amount saved

S = P_{o} - P_{f}

Effective discount

d_{eff} = \frac{P _{o} - P _{f}}{P _{o}} \times 100

Original price from sale price

P_{o} = \frac{P _{f}}{1 - \frac{d}{100}}

Two stacked discounts

P_{f} = P_{o} (1 - \frac{d _{1}}{100}) (1 - \frac{d _{2}}{100})

Effective stacked discount

d_{eff} = 100 [1 - (1 - \frac{d _{1}}{100}) (1 - \frac{d _{2}}{100})]

$P_{o}$: Original price
$P_{f}$: Final or sale price
$d$: Discount percentage
$d_{1}$: First percentage discount
$d_{2}$: Second percentage discount
$d_{e} f f$: Effective overall discount percentage
$S$: Amount saved

Examples

20% off

Original price 100; discount 20%

Final price 80; save 20.

25% off 240

Original price 240; discount 25%

Final price 180; save 60.

35% off 80

Original price 80; discount 35%

Final price 52; save 28.

Fixed amount off

Original price 120; amount off 25

Final price 95; effective discount about 20.83%.

Find the original price

Sale price 80 after a 20% discount

Original price 100.

Stack 20% and 10%

Original price 100; 20% off, then another 10% off

Final price 72; save 28; effective discount 28%.

Two 50% discounts

Original price 200; 50% off followed by another 50% off

Final price 50; total saving 150; effective discount 75%.

Frequently Asked Questions

How do I calculate a discount?

Multiply the original price by the discount percentage divided by 100 to find the saving, then subtract that amount from the original price.

How do I calculate 10% off?

Multiply the original price by 0.90. For example, 10% off 80 leaves a final price of 72.

How do I calculate 20% off?

Multiply the original price by 0.80. For example, 20% off 100 leaves 80.

How do I calculate 25% off?

Multiply the original price by 0.75. A 25% discount on 200 leaves a final price of 150.

How do I calculate 30% off?

Multiply the original price by 0.70. A 30% discount on 50 leaves a final price of 35.

How do I calculate 50% off?

A 50% discount leaves half of the original price. Divide the original price by two or multiply it by 0.50.

How do I calculate how much I saved?

Subtract the final price from the original price. If a price falls from 100 to 75, the saving is 25.

How do I find the original price before a discount?

Divide the sale price by the proportion that remains after the discount. If 80 is the price after 20% off, divide 80 by 0.80 to get 100.

Why can I not just add the discount percentage back?

The sale discount was calculated from the larger original price. Adding the same percentage to the smaller sale price uses a different base. For example, adding 20% to 80 gives 96, not the original 100.

Do stacked discounts add together?

No. Each percentage applies to the price remaining after the previous discount. For example, 20% off followed by 10% off gives an effective discount of 28%, not 30%.

Does the order of two percentage discounts matter?

No. If both discounts are percentages applied sequentially to the current price, reversing their order produces the same final amount.

Is 50% off twice the same as 100% off?

No. Two sequential 50% discounts leave 25% of the original price, which is an effective discount of 75%.

Can I use a fixed amount instead of a percentage?

Yes. Choose Amount off and enter the original price and the fixed amount to subtract.

Can I reverse a 100% discount?

No. A sale price of zero after a 100% discount does not contain enough information to recover the original price.

Does the calculator include sales tax or VAT?

No. It calculates the discount only. Taxes, VAT, shipping, and other fees must be handled separately.

What currency can I use?

Any currency can be used because the calculator works with numerical amounts rather than exchange rates. Keep all amounts in the same currency.