Discount Calculator

Calculate sale price, savings, and optional sales tax. Supports percent-off and amount-off discounts.

How to Use

  1. Enter the original price.
  2. Choose a discount type (percent off or amount off).
  3. (Optional) Add sales tax to see your final total.
  4. Open “Show Work” to see the formulas used.
Inputs
All calculations are local (browser-only) and deterministic.
Enter the price before any discounts or tax.
Pick the discount style you have (or set a target price).
For % off: 0–100. For $ off: 0+ . For target: desired sale price.
Optional: calculate totals for multiple items.
Applied after discounts. Leave unchecked to ignore tax.
Final Total
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Enter inputs
Sale (each)
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Save (each)
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Tax (each)
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Qty
1

Presets

Presets fill the form (no URL changes).

Notes

  • Sales tax is applied after discount (common retail behavior).
  • Effective discount is based on original price vs sale price.
  • Target Price mode solves the implied discount.
Show Work (step-by-step)
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Work is shown in dollars and percent. Tax is applied after discounts when enabled.

Formulas

  • Percent off: Sale = Price × (1 − p/100)
  • Amount off: Sale = Price − d
  • Target price: Savings = Price − Target; Effective % = (Savings / Price) × 100
  • Tax: Tax = Sale × (t/100); Total = (Sale + Tax) × Qty

FAQ

Do you calculate tax before or after discount?

This tool applies tax after discount (typical at checkout). You can disable tax anytime.

What’s “effective discount”?

It’s the actual percent saved from the original price: (Original − Sale) / Original.

Can this do BOGO?

Use quantity + amount/percent modes for common cases. The preset “BOGO 50%” fills a typical example (2 items, one half off).

Tool Info

Last updated:

Updates may include edge-case handling, formatting improvements, and additional discount workflows.