What the result explains
What This Calculator Provides
Enter an original price and discount percentage to see the amount saved and the sale price. An optional sales-tax rate can then be applied to the discounted price to estimate the checkout total. This ordering matches a common retail calculation, but tax rules differ by location and product. The tool supports one discount; it does not pretend that successive markdowns can be added together.
- discount amount saved
- sale price before tax
- optional tax and final total
How to Use This Calculator
- Enter the known valuesUse the labeled fields and units shown in the calculator. Correct any validation message before continuing.
- Review the resultRead the main answer together with its breakdown, formula, rounding, and assumptions.
- Copy and verifyCopy the result when available, then check important decisions against the relevant record, institution, or professional.
Method
Formula and Calculation Method
Discount formula
saved = original × (discount % ÷ 100); sale price = original − saved
When tax is entered, tax = sale price × tax rate and total = sale price + tax.
Worked from input to answer
Worked Examples
$100 with 20% off and 8% tax
- Saved = $100 × 0.20 = $20
- Sale price = $100 − $20 = $80
- Tax = $80 × 0.08 = $6.40
Result: Final estimate = $86.40; savings before tax = $20.00.
$250 with 15% off
- Saved = $250 × 0.15 = $37.50
- Sale price = $250 − $37.50
Result: Sale price = $212.50.
Price First, Then Everything Else
A discount is a percentage applied backwards, and the percentage calculator is the general form if you want to see the arithmetic without the retail framing.
Reducing the price matters more than optimizing the financing that follows: check the sale figure here, then see what borrowing it costs with the loan calculator or as monthly installments. For meals, the tip calculator handles the other direction.
Why stacked discounts are not additive
A 20% discount followed by 10% off does not equal 30% off. The second markdown applies to the already-reduced 80% price: 0.80 × 0.90 = 0.72, so the final price is 72% of the original—a 28% total discount. This calculator accepts one combined stage, so calculate successive stages separately if needed.
Tax after discount
The optional tax calculation uses the discounted sale price as its base. Actual taxable amounts, exemptions, fees, and rounding can differ by jurisdiction and receipt system.
Discount amount versus final price
The amount saved is the part removed from the original price. The sale price is what remains before tax. Keeping these two values separate prevents the common mistake of treating “20% off” as a final price of 20% of the original.
Practical Uses
- Checking retail markdowns
- Comparing coupons or sale percentages
- Estimating checkout price with tax
- Planning a shopping budget
- Explaining successive discounts
Assumptions
- The discount is applied once to the original price.
- Optional tax is applied after the discount.
- The entered tax percentage is appropriate for the item and location.
Important Limitations
- Shipping, fees, rebates, cash-back offers, and coupon restrictions are not included.
- Successive discounts must be applied one stage at a time.
- Actual receipt rounding and tax rules may differ.
Help & support
Frequently Asked Questions
Quick answers to common questions about the Discount calculator.
What is 20% off $100?
The savings are $20 and the sale price before tax is $80.
Is tax calculated before or after the discount?
This tool calculates tax from the discounted price. Local tax rules can differ.
Do 20% off and 10% off equal 30% off?
No. Applied successively, they produce a 28% total discount because the second discount uses the reduced price.
Can a discount exceed 100%?
No. The calculator accepts discount rates from 0% through 100%.