Discount Calculator
Discount Calculator separates a percentage reduction into the amount saved and the price remaining before any additional taxes, fees, shipping, or sequential promotions. It answers “what is x% off?” rather than determining the final checkout total under every retail rule. Percentage discounts apply to the stated base price, so verify which price the seller actually uses.
Runs locally — files stay on your deviceWhat is 20% off 80?
You save 16 and the discounted price is 64.
Formula: Savings = 80 × 20 ÷ 100; final = 80 − 16
A discount removes a percentage of the base price
Savings = original price × discount rate. Final price = original price × (1 − discount rate). A 100% discount reduces the modeled price to zero; values above 100% usually do not describe ordinary retail discounts.
How it works
Enter the price before this discount and the displayed percentage. Add taxes, fixed coupons, shipping, or other adjustments separately and in the order specified by the seller.
Key concepts
Sequential discounts multiply
Twenty percent off followed by ten percent off leaves 0.8 × 0.9 = 72% of the original, a 28% total reduction rather than 30%.
Savings and final price are different outputs
The savings is the removed portion; the final price is what remains before other adjustments.
When to use it
- Find the sale price from one percentage reduction.
- Compare savings across two original prices.
- Check a posted promotion before tax and fees.
When not to use it
- Do not assume two discounts can be added together directly.
- Do not treat a discount from an inflated reference price as objective value.
- Do not omit taxes or fixed charges when estimating checkout cost.
Worked examples
Standard sale
- Input
Price 80; discount 20%- Expected output
Save 16; pay 64
Twenty percent is one fifth of eighty.
Decimal percentage
- Input
Price 200; discount 7.5%- Expected output
Save 15; pay 185
Decimal percentage values use the same formula.
Sequential offer
- Input
100 with 20% then 10%- Expected output
80 then 72
The second discount uses the already reduced price.
Common mistakes
Adding sequential percentages
The second reduction uses a smaller base. Correction: Apply each discount in order.
Subtracting the percentage number as currency
Twenty percent does not always mean twenty currency units. Correction: Multiply the current base price by the decimal rate.
Calling pre-tax price the checkout total
Taxes and fees may still apply. Correction: Add known post-discount charges separately.
Best practices
- Confirm the applicable base price.
- Apply promotions in the stated order.
- Compare final price, not only the percentage headline.
Related operations and differences
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Choose Break-Even Price Calculator when you need to find the unit price that covers cost and fees.; use Discount Calculator specifically for discount.
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ROI Calculator
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Unit Price Calculator
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Limitations and privacy
- This calculator provides a mathematical estimate, not financial, tax, legal, or investment advice.
- Taxes, fees, shipping, fixed coupons, minimums, and promotion stacking are not included.
- Currency-specific rounding rules may differ.
Financial inputs are calculated locally in this browser and are not uploaded.
Frequently asked questions
How do I calculate the sale price?
Multiply original price by one minus the discount rate.
Are 20% and 10% discounts equal to 30% off?
Not sequentially; together they leave 72% of the original, a 28% reduction.
Does the result include tax?
No. It calculates only the entered percentage discount.
Can a discount exceed 100%?
The arithmetic can, but it usually does not represent a normal sale price.