Percent Off Calculator

Calculate sale price, discount amount, money saved, and optional total after tax. Also includes reverse mode to estimate the original price from a discounted price.

How to Use

  1. Enter the original price and the percent off.
  2. Optionally enter sales tax to estimate the final checkout total.
  3. Switch to reverse mode if you already know the sale price and discount percent.
  4. Open “Show Work” to view the formulas and step-by-step breakdown.
Discount Summary
Sale Snapshot
Live readout for savings, sale price, and optional tax-adjusted total.
You Save
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Sale Price
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Tax
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Final Total
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Inputs & Settings
Use standard discount mode or reverse mode. Currency formatting is handled client-side.
Price before discount.
Enter the markdown percentage.
Used mainly in reverse mode.
Optional. Leave blank or 0 for no tax.
Show Work (step-by-step)
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Work is shown using standard percentage formulas. Tax is applied after discount when enabled.

Percent Off Formulas

Quick answer: A percent off discount subtracts a percentage of the original price from the starting price.

The calculator supports both regular and reverse discount workflows.

  • Discount Amount: Original Price × (Percent Off ÷ 100)
  • Sale Price: Original Price − Discount Amount
  • Tax Amount: Sale Price × (Tax Rate ÷ 100)
  • Final Total: Sale Price + Tax Amount
  • Reverse Original Price: Sale Price ÷ (1 − Percent Off ÷ 100)
Example: $100 at 25% off saves $25 and gives a sale price of $75.

FAQ

How do I find the sale price after a discount?

Multiply the original price by the discount percent to get the amount saved, then subtract that amount from the original price.

Do stores usually apply tax before or after the discount?

In most normal retail cases, tax is applied after the discount is taken off the original price.

Can I use this to work backward from a sale price?

Yes. Reverse mode estimates the original price when you know the sale price and the percent off.

What if the percent off is 100%?

A 100% discount makes the sale price zero. Reverse mode may be undefined at 100% because the original price cannot be solved normally from a zero remainder percentage.

Tool Info

Last updated:

Includes standard percent-off mode, reverse mode, optional tax handling, and share-ready structure.