How do I calculate a percentage discount?

Sale Price = Original Price × (1 − Discount% ÷ 100). For a 30% discount on $80: Sale Price = $80 × 0.70 = $56. You save $24.

How do I find the discount percentage from two prices?

Discount% = (Original Price − Sale Price) ÷ Original Price × 100. If an item was $120 and is now $84: Discount% = (120 − 84) ÷ 120 × 100 = 30%.

Does the discount apply before or after tax?

Discounts are always applied to the pre-tax price. Sales tax is then calculated on the discounted (sale) price. This calculator follows that order.

What is a compound discount?

A compound discount applies multiple discounts successively. For example, 20% off followed by an additional 10% off is not 30% off — it is 28% off (you pay 80% then 90% of that = 72%, saving 28%).

What is the difference between discount and markdown?

A discount is a temporary price reduction (a sale), while a markdown is a permanent price reduction because the item no longer sells at the original price. Both result in a lower selling price but have different retail accounting implications.

Calculadora de Desconto

How the Discount Calculator Works

The Discount Calculator helps you instantly find out how much you will pay after a percentage-off sale, or figure out what discount percentage you received when you already know the sale price. It also applies sales tax so you can see your true out-of-pocket cost.

Discount Percentage Mode

When you know the original price and the discount percentage, the calculator uses:

Sale Price = Original Price × (1 − Discount% ÷ 100)

For example, if an item costs $120 and is 25% off:

Sale Price = $120 × (1 − 0.25) = $120 × 0.75 = $90
Savings = $120 − $90 = $30
Final price after 8% tax = $90 × 1.08 = $97.20

Final Price Mode

Sometimes you see a price tag showing both the original and the sale price, and you want to know the implied discount. Enter both prices and the calculator computes:

Discount% = ((Original − Sale) ÷ Original) × 100

Savings Percentage

Savings percentage equals the discount percentage in most cases. It confirms how much of the original price you are keeping in your pocket.

After-Tax Price

In many regions, sales tax is applied after discounts. The calculator multiplies the sale price by (1 + Tax Rate ÷ 100), giving you the total amount you will pay at checkout.

When Is This Useful?

Black Friday and seasonal sales: Quickly verify advertised savings are accurate.
Coupon stacking: Calculate one discount at a time to see combined savings.
Retail price comparison: Determine whether a “sale” item is actually cheaper than a competitor’s regular price.
Budget planning: Know your exact spend including local tax before heading to the register.

Tips for Smart Shopping

Always confirm whether the discount applies before or after tax — most retailers apply tax on the post-discount price.
Compare the final after-tax price, not just the sale price, when shopping across different tax jurisdictions.
For percentage-off coupons on items that are already on sale, apply each discount sequentially, not combined — a 20% coupon on a 20% sale item does not give 40% off.

Formula Summary

Scenario	Formula
Sale price from discount	`Sale = Original × (1 − Discount/100)`
Discount from prices	`Discount% = (Original − Sale) / Original × 100`
After-tax total	`Total = Sale × (1 + TaxRate/100)`
Savings amount	`Savings = Original − Sale`