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Free Online Discount Calculator

This free online discount calculator works as a sale price calculator and percent off calculator. Enter the original price and either the discount percent or the final sale price—you see how much you save and the price after discount right away. If you only know both prices on the tag, switch modes to calculate discount percentage. Results update as you type.

100
20
You save$20.00
Sale price$80.00
Discount20.0% off

More percent math? Percentage calculator · Tip calculator

How discount and sale price work

A discount is a percent taken off the original (regular) price. Amount saved = original × (discount ÷ 100). Sale price = original − amount saved.

Example: 25% off $80 → save $20 → you pay $60.

If you already know the sale tag price, switch to Find discount % and enter original plus sale price to see what percent off that is.

For general percent math (tax, tips, test scores), use the percentage calculator.

Worked examples

Real problems you might enter in the calculator above, with short walkthroughs.

  • 30% off a $120 jacket

    120 × 0.30 = 36 off. 120 − 36 = 84 sale price.

    PriceOriginal $120 · 30% offSale priceSave $36 · Pay $84

  • Black Friday: was $249, now $179

    Saved $70. (70 ÷ 249) × 100 ≈ 28.1% discount.

    PriceOriginal $249 · Sale $179Sale priceAbout 28.1% off

  • 10% member discount on $45

    Small discounts still use the same formula.

    PriceOriginal $45 · 10% offSale priceSave $4.50 · Pay $40.50

  • Half price clearance

    50% off means you pay half the original price.

    PriceOriginal $64 · 50% offSale priceSave $32 · Pay $32

Frequently asked questions about the discount calculator

  • How do I calculate sale price after a discount?

    Multiply the original price by the discount percent divided by 100 to get the savings. Subtract that from the original. Example: 20% off $50 → save $10 → pay $40.

  • How do I find the discount percent from two prices?

    Subtract sale price from original to get amount saved. Divide by the original and multiply by 100. Example: $80 down to $60 → save $20 → (20 ÷ 80) × 100 = 25% off.

  • Is the discount taken before or after tax?

    Stores usually apply percent off the pretax price, then add sales tax on the discounted amount. This tool does not include tax—only the price discount.

  • What if there are two discounts (e.g. 20% off plus extra 10%)?

    They rarely add straight (20 + 10). The second percent usually applies to the already-reduced price. Run each step separately or check the store’s terms.

  • Can I use this for coupon codes?

    Yes, if the coupon is a straight percent off or a fixed sale price. Enter the original shelf price and your discount or final price.

  • Is this discount calculator free?

    Yes. It runs in your browser with no signup.