# Free discount calculator

> Enter a price and a discount — either as a percentage or a fixed dollar amount — to see exactly how much you save and what you pay.

Find the final price and amount saved for any percent-off or dollar-off discount.

**Interactive version:** https://onlinecalculator.me/finance/discount/
**Category:** Finance

## How to use

1. Select **Percent off** (for a "20% off" tag) or **Dollar off** (for "$30 off").
2. Enter the original price before any discount.
3. Enter the discount — a percentage or a dollar amount.
4. The amount saved, final price, and effective discount percentage appear instantly.

## Formula

**Percent-off mode:**

- Savings = price × (discount% ÷ 100)
- Final = price − savings

**Dollar-off mode:**

- Final = price − discount amount
- Discount% = savings ÷ price × 100

## Worked examples

### $80 item at 25% off

- Savings = 80 × 0.25 = **$20**
- Final price = 80 − 20 = **$60**

### $200 item with $30 off

- Final price = 200 − 30 = **$170**
- Effective discount = 30 ÷ 200 = **15%**

### Stacked discounts — 20% off, then extra 10% off

Discounts compound multiplicatively, not additively:

- After first 20% off: 100 × 0.80 = $80
- After extra 10% off: 80 × 0.90 = **$72**
- Total effective discount = **28%**, not 30%

## Notes

- **Sales tax stacks on top.** Most U.S. states apply sales tax to the discounted price, not the original. Run the final price through the sales-tax calculator next.
- **Coupon timing matters.** A "$10 off" coupon applied before tax reduces the tax too; applied after tax it doesn't.
- **Final price floors at $0.** The calculator won't return a negative number even if the discount exceeds the original price.

## Frequently asked questions

### How is a percent-off discount calculated?

Savings = original price × (discount% ÷ 100). Final price = original − savings.

### How is a dollar-off discount calculated?

Final price = original − discount amount. Discount% = discount ÷ original × 100.

### What if the discount is larger than the price?

The final price floors at $0 — it cannot go negative. The discount amount caps at the original price.

### How is the effective discount percentage shown?

In percent-off mode the percentage you enter is shown directly. In dollar-off mode the calculator derives the equivalent percentage from the dollar savings divided by the original price.

### How do I share my calculation?

Click "Share with my numbers" to copy a URL that restores all your inputs.

## Sources

- [Discounts and allowances](https://en.wikipedia.org/wiki/Discounts_and_allowances) — Wikipedia
- [Percentage increase and decrease](https://en.wikipedia.org/wiki/Percentage) — Wikipedia

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Machine-readable index: https://onlinecalculator.me/llms.txt