# Discount calculator

URL: https://shahid09.is-a.dev/tools/discount-calculator/
Author: Muhammad Shahid (https://shahid09.is-a.dev/)
Free tool · runs in your browser

Find the sale price and how much you save, including double discounts and sales tax.

**Quick answer:** To find a sale price, multiply the original price by (1 − discount ÷ 100): 25% off 80 is 80 × 0.75 = 60, a saving of 20. Enter the price and discount here to see the result. Add a second discount, and it applies to the already reduced price, so 20% then 10% off is 28%, not 30%. You can also add sales tax and quantity.

## How to use it

1. **Enter the price and discount.** The result appears as soon as both are filled in.
2. **Add the extras.** Optionally add a second discount, sales tax and quantity.
3. **Read the results.** See what you pay, what you save and the effective discount.

## Example

Two items at 100 each, with 20% off, then 10% off, then 5% tax:

Input:

```
Price: 100, Quantity: 2
Discount: 20%, Extra: 10%, Tax: 5%
```

Output:

```
Price after discount: 144.00
You save: 56.00 (28%)
Tax: 7.20
You pay: 151.20
```

## Common errors and how to fix them

- **Adding two discounts gave the wrong price**: Stacked discounts multiply rather than add. Use the "Extra discount" field for the second one.
- **Check the numbers**: Discounts must be between 0 and 100%, and prices cannot be negative.

## Frequently asked questions

### How do I calculate a discount?

Multiply the price by the percentage and divide by 100 to get the saving, then subtract it. For 30% off 50: 50 × 30 ÷ 100 = 15, so you pay 35.

### Is 20% off then 10% off the same as 30% off?

No. The second discount applies to the reduced price, so the total is 28%. On a price of 100 you pay 72, not 70.

### Does the order of two discounts matter?

No. 10% then 20% gives the same final price as 20% then 10%.

### Is tax charged before or after the discount?

Usually on the discounted price, which is how this calculator works. Coupons from a manufacturer can be treated differently in some places.

### How do I find the original price from a sale price?

Divide the sale price by (1 − discount ÷ 100). If 75 is the price after 25% off, the original was 75 ÷ 0.75 = 100.

### How do I find the percentage off?

Divide the saving by the original price and multiply by 100. The [percentage calculator](https://shahid09.is-a.dev/tools/percentage-calculator/) can do this for you too.

### Is a percentage discount better than money off?

Compare them on your actual total: 20% off beats 10 off when you spend more than 50.

### Which currencies does it work with?

Any. Enter plain numbers; the calculation is the same in every currency.

### How do I work out what percentage I saved?

The tool shows it as "Effective discount". For other percentage questions, use the percentage calculator.

### Can I add VAT or GST to the discounted price?

Yes, enter the rate in the tax field. To add or remove tax on its own, use the [GST calculator](https://shahid09.is-a.dev/tools/gst-calculator/).

## Related

- [Percentage calculator](https://shahid09.is-a.dev/tools/percentage-calculator/)
- [GST calculator](https://shahid09.is-a.dev/tools/gst-calculator/)
- [Loan calculator](https://shahid09.is-a.dev/tools/loan-calculator/)

## Sources

- [Wikipedia: Percentage](https://en.wikipedia.org/wiki/Percentage)