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Discount Calculator

Use this discount calculator to find the sale price, savings, and estimated total after tax for coupons, markdowns, and shopping deals.

Live calculator

Discount calculator

Sale price$90.00

Effective discount is 25.0%.

You save$30.00

Percent discount plus any fixed coupon amount.

Total after tax$97.43

$7.43 estimated sales tax.

Shopping results are planning estimates. Check package size, usable quantity, taxes, coupons, shipping, and subscription terms before choosing the better buy.

Formula

Discount formula

Sale price = original price - (original price x discount percent) - coupon amount

Sales tax is estimated after the discount and coupon are applied.

How to use

Steps

  1. Enter the original price.
  2. Enter the discount percentage.
  3. Add a fixed coupon amount if one applies.
  4. Enter sales tax to estimate the final checkout total.

Example

Sample calculation

Original price$120.00
Discount25%
Sale price$90.00

Calculator use

Best for

  • Comparing real checkout cost, package value, unit price, rewards, coupons, or recurring spend before buying.
  • Checking whether a lower sticker price still wins after taxes, discounts, waste, storage limits, or usable servings.

Before relying on it

Check first

  • Comparing items with different quality, usable quantity, expiration risk, package units, or tax treatment.
  • Forgetting shipping, deposits, coupons that apply before tax, reward exclusions, or recurring charges.
  • Treating the lowest unit cost as best when storage space, spoilage, brand fit, or actual usage changes value.

Details

What to know before using the result

Percent offConvert to decimal

A 25% discount means 0.25 of the original price is removed before fixed coupons or tax estimates are applied.

Coupon orderFixed amount after percent

This calculator subtracts the percentage discount first, then subtracts the fixed coupon amount. Store rules may apply coupons in a different order.

Savings claimCheck original price

A large discount only means large savings if the original price is a realistic comparison price.

Source notes

References used for this calculator

OpenStaxCovers percent equations plus percent increase and decrease examples used for discount math.

Benchmarks

How to read the result

10% off: Small sale.

Useful for quick everyday markdowns.

25% - 40% off: Strong sale.

Often enough to compare against waiting or buying now.

50%+ off: Deep discount.

Check whether the original price is realistic before assuming savings.

Calculator accuracy

Methodology and assumptions

Formula, inputs, limitations and review record
Formula

Sale price = original price - (original price x discount percent) - coupon amount

Inputs used

Original price, Discount percent, Coupon amount, Sales tax

Limitations

Shopping calculators compare visible price assumptions, but real value can change with quality, spoilage, package size, rewards, taxes, shipping, and recurring charges.

Review record

Catalog QA baseline on June 6, 2026. This date marks the catalog-wide automated and editorial QA baseline, not a tool-specific expert review.

Cite this page

Toolkit Shelf. Discount Calculator. https://toolkitshelf.com/tools/discount-calculator

FAQ

Common questions

How do I calculate a discount?

Multiply the original price by the discount percentage, then subtract that amount from the original price.

Is tax calculated before or after the discount?

This calculator estimates tax after the discount. Actual rules can vary by location and item type.

What is effective discount?

Effective discount is the total savings as a percentage of the original price, including any fixed coupon amount.