Discount Calculator — Sale Price & Amount Saved

Work out exactly how much you save and what you pay with our free discount calculator. Enter the original price and the discount percentage, add an extra discount or sales tax if you need to, and get the sale price, the amount saved and the final total instantly — no sign-up, no download.

Current as of November 2026. All calculations are done instantly in your browser; nothing you enter is saved or sent anywhere.

Original price ($)

Discount (%)

Extra discount (%) — optional

Sales tax (%) — optional

You save

$25.00

Sale price

$75.00

Final total (with tax)

$81.00

Worked example

$100 original price, 25% off: 25% of $100 = $25 saved, so the sale price is $100 − $25 = $75. With 8% sales tax added, tax is 8% of $75 = $6, and the final total is $75 + $6 = $81.

How It Works

Enter the original price — the price before any discount, using the box or the slider.
Set the discount percentage — type it, slide it, or tap a preset like 10%, 20%, 25%, 30% or 50% off.
Add an extra discount if there is one — for example, an extra 10% off the already-reduced price at the till. Leave it at 0% if there is none.
Add sales tax if it applies — tax is charged on the discounted price, so enter your local rate (for example 8%).
Read your results instantly — the amount saved, the sale price and the final total with tax update live as you change anything.

The maths behind it: amount saved = original price × discount %; sale price = original price − amount saved; extra discount is taken off the sale price; final total = discounted price + (discounted price × tax %).

Frequently Asked Questions

How do I calculate a discount price?

Multiply the original price by the discount percentage to find the amount saved, then subtract it from the original price. For example, 25% off $100 is $25 saved, so you pay $75.

What is 20% off $100?

20% of $100 is $20, so 20% off $100 means you save $20 and pay $80 before tax.

How does an extra discount work?

An extra discount applies to the already-discounted price, not the original price. For example, 25% off $100 gives $75, then an extra 10% off takes 10% of $75 ($7.50), leaving $67.50. The two discounts do not simply add up to 35% off.

Is sales tax charged before or after the discount?

Sales tax is normally charged on the discounted (sale) price, not the original price. That is how this calculator works: tax is applied after all discounts.

What is the difference between the sale price and the final total?

The sale price is what the item costs after discounts but before tax. The final total is the sale price plus sales tax — the amount you actually pay at the checkout.

Can I use this discount calculator for any currency?

Yes. The calculator uses dollars ($) in its labels, but the maths is the same for pounds, euros or any other currency — just enter the price in your own currency and read the results the same way.

Estimates disclaimer: Results from this calculator are estimates for general guidance only. The exact amount you pay can differ because of rounding, store-specific discount rules, coupons, shipping, and local tax rates and exemptions. Always check the final price shown at the checkout before you buy. ToolNly is not responsible for pricing decisions made using this tool.