SuperCalc

Discount Calculator

Calculate the sale price after any percentage discount. See your savings instantly, add optional sales tax, and get the final out-of-pocket cost.

Discount Calculator

Calculate the sale price, savings, and optional tax.

0%50%100%
Original Price$100.00
Discount (20%)−$20.00
Final Price$80.00
You save$20.00
Quick Discounts

How it works

The discount formula is straightforward: Sale Price = Original Price × (1 − Discount ÷ 100). For a $100 item at 20% off, the math is $100 × 0.80 = $80.

If sales tax applies, it's calculated on the discounted price, not the original. So $80 with 8% tax becomes $80 × 1.08 = $86.40 — you save on tax too.

This calculator handles everything from simple store discounts to complex scenarios with tax. All math runs in your browser — no data is sent anywhere.

FAQ

How do I calculate a discount?
Multiply the original price by the discount percentage, then divide by 100. For example, 20% off $50: $50 × 20 ÷ 100 = $10 discount, so the sale price is $40.
How do I calculate the sale price after a discount?
Subtract the discount amount from the original price. Or use the shortcut: multiply the price by (1 − discount/100). For 20% off $50: $50 × 0.80 = $40.
How does sales tax work with discounts?
Sales tax is applied after the discount. If an item is $100 with 20% off, the discounted price is $80. With 8% tax: $80 × 1.08 = $86.40.
What is the difference between 20% off and $20 off?
20% off scales with the price — on a $50 item it's $10, on a $200 item it's $40. A flat $20 off is always $20 regardless of price. Percentage discounts save more on expensive items.
How do I calculate double discounts?
Apply each discount sequentially, not additively. 20% off then 10% off is NOT 30% off. It's: $100 × 0.80 = $80, then $80 × 0.90 = $72. Total discount is 28%, not 30%.

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