Finance

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Discount Calculator.

Calculate sale price and savings

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Mode
Final Price: $80.00

Final Price

$80.00
Savings: $20.00

Savings

$20.00
Original Price:$100.00
Effective Discount:20.00%

How to Use

  • Basic: Calculate final price with a single discount
  • Multiple: Apply successive discounts (e.g., "20% off + extra 10% off")
  • Reverse: Find the original price before discount
  • Find %: Calculate what discount percentage was applied

FAQs

How do I calculate a discount percentage?

To calculate discount: multiply the original price by the discount percentage (as a decimal). For example, 20% off $100 = $100 × 0.20 = $20 discount. Final price = $100 - $20 = $80.

How do multiple discounts work?

Multiple discounts are applied successively, not added together. For example, 20% off + 10% off is not 30% off. If an item costs $100: first discount gives $80, then 10% off $80 = $72 final price (28% total discount).

Can I find the original price if I know the sale price?

Yes! Use the 'Reverse' mode. If you know the final price and the discount percentage, the calculator can determine what the original price was before the discount.

What's the difference between 20% off and 20% discount?

They mean the same thing. Both indicate that you pay 80% of the original price and save 20%.

Cite this calculator

Canonical URL: https://mathify.one/zh/finance/discount

Cite as: Mathify. (2026). 折扣计算器. https://mathify.one/zh/finance/discount

Use Cases

Shopping during sales

Quickly determine the final price of an item during a store-wide sale or when using a percentage-off coupon, helping you stay within budget.

Example: A $80 jacket with a 25% discount: sale price = $60, savings = $20.

Comparing deals

Evaluate different discount offers on the same item to see which one gives you the best price, especially when discounts vary.

Example: Compare 30% off a $50 item vs. 20% off a $45 item to see which is cheaper.

Frequently Asked Questions

How do I calculate the sale price using this discount calculator?
Enter the original price of the item and the discount percentage (e.g., 20 for 20% off). The calculator will subtract the discount amount from the original price to give you the sale price, and also show you how much you save.
Can I use this calculator for discounts that are not percentages, like 'buy one get one free'?
This calculator is designed for percentage-based discounts only. For other types of offers, you may need to manually calculate the equivalent percentage or use a different tool.
Does the discount calculator include taxes or shipping costs?
No, this calculator only computes the sale price and savings based on the original price and discount percentage. Taxes, shipping, and any additional fees are not included and would need to be added separately.

Tips & Common Mistakes

Tips

  • Always double-check the discount percentage you enter – a common mistake is entering 0.20 instead of 20.
  • If the discount is not a whole number, like 15.5%, enter it as 15.5 for accurate results.
  • Use the savings amount to decide if the deal is worth it, especially if you are considering buying multiple items.
  • Remember that the sale price is before tax, so factor in additional costs if needed.

Common Mistakes to Avoid

  • Entering the discount as a decimal (e.g., 0.25) instead of a percentage (25).
  • Forgetting to include the original price in the correct currency or with the right number of decimal places.
  • Assuming the calculator includes taxes or shipping, which it does not.

Last updated: August 13, 2026