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Pricing & Profit

Discount Calculator

Calculate the final sale price and the amount saved from an original price and a percentage discount.

Enter the original price and the discount percentage. Sales tax is optional.

Enter your values

The price before any discount is applied.

$

Percentage taken off the original price.

%

Optional. Applied to the discounted price, not the original price.

%

Results

Final price

—

Enter an original price and a discount percentage.

You save

—

The amount taken off the original price.

Discount applied

—

The percentage entered.

Results are estimates based on the values entered and are provided for general planning.

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Step by step

How to use the discount

  1. Enter the Original price before any discount.
  2. Enter the Discount as a percentage.
  3. Optionally enter Sales tax — it is applied to the discounted price, not the original price.
  4. Read the final price, the amount saved, and the discount applied.

Method

How to calculate discount

A percentage discount is the original price multiplied by the discount rate. Subtracting that amount from the original price leaves the sale price. If sales tax applies, it is normally charged on the discounted amount actually paid, so tax is calculated after the discount rather than before it.

Formula

Discount amount = Original price × Discount % ÷ 100
Final price = Original price − Discount amount
With tax: Tax = Final price × Tax % ÷ 100, then add it back

Assumptions

  • One percentage discount applies to the full original price.
  • Sales tax, when entered, is applied to the discounted price rather than the original price.
  • No tax rates are looked up automatically — the rate entered is the rate used.
  • Stacked or sequential discounts are not modelled here.

Savings, tax, and the final price are calculated at full precision before display. Currency displays two decimals; percentages display two decimals.

How to interpret the result

The final price is what a buyer pays under the discount entered. The savings figure is the seller's revenue reduction, not a cost saving: the cost of the item does not fall when the price does. Before approving a discount, compare the final price with your unit cost to confirm the sale still leaves an acceptable margin.

Discounting and margin

A discount reduces the price but not the cost of goods. An item costing $60 sold at $120 carries a 50% margin; discounted 25% to $90 the margin falls to 33.3%, and gross profit per sale drops from $60 to $30.

That means volume has to rise substantially for a discount to be profit-neutral. Halving margin requires doubling units sold simply to hold gross profit steady.

Original price, savings, and final price

Three numbers describe every percentage discount. The original price is the list price before any reduction. The savings are the original price multiplied by the discount rate. The final price is what remains: original price minus savings, plus any sales tax you enter on top.

Keep the three separate when comparing offers. "$30 off" and "25% off" are the same deal only on a $120 item; on a $60 item, 25% off saves just $15.

Why stacked discounts are not additive

This calculator applies one discount rate per calculation. The explanation below is for understanding how sequential offers combine, not a feature of the calculator.

When a second discount is applied to an already reduced price, it works on a smaller base. A 20% discount followed by a 10% discount leaves 0.80 × 0.90 = 0.72 of the original price — a 28% total reduction, not 30%. On a $100 item that is $72, compared with $70 for a single 30% discount.

To check a stacked offer here, run the first discount, then enter the resulting price as the original price and apply the second rate.

Edge cases and limitations

A 100% discount is accepted and produces a final price of $0, with savings equal to the original price; any tax entered is then $0 as well. A 0% discount returns the original price unchanged.

The calculator does not look up tax rates, handle fixed-amount coupons, buy-one-get-one offers, minimum-spend thresholds, or shipping. It also cannot tell you whether a discount is profitable — compare the final price with your unit cost, or use the profit margin calculator.

Frequently asked questions

Multiply the original price by the discount percentage divided by 100 to get the savings, then subtract that amount from the original price. A 25% discount on $120 is $30 off, giving $90.

Yes. Sales tax is optional. When you enter a rate, tax is applied to the discounted price and added to produce the final amount paid.

A final price of $0. That is a valid entry, and the savings equal the original price.

Not in one calculation — this calculator applies one discount rate at a time. To see a stacked result, apply the first discount, then enter the new price as the original price for the second. A 20% discount followed by 10% is a 28% total reduction, not 30%, because 0.80 × 0.90 = 0.72.

Before. When you enter a tax rate, tax is calculated on the discounted price, so a $120 item at 25% off with 8% tax costs $97.20 rather than $99.60.

No. The saving reduces revenue by the full discount amount, but profit falls only by the share of that revenue you would have kept after cost.

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