Discount Calculator

Calculate sale price after discount with optional sales tax. Supports stacked percentage discounts.

By Konstantin Iakovlev · Updated September 2026 · Source: BLS

$
Discount Type
%
%

You Save

$20.00

Sale Price

$80.00

Discount Breakdown

Original Price$100.00
First Discount- $20.00
Total Savings$20.00
Effective Discount20.0%
Sale Price$80.00

Use the Discount Calculator above to calculate your results. Enter your values and see instant results — all calculations run in your browser.

Disclaimer: This calculator is for informational purposes only. Results are estimates based on the information you provide and the assumptions described on this page.

How It Works

Figuring out what you'll actually pay after a sale, with sales tax folded in, takes more arithmetic than most price tags suggest. Feed in the original price, a discount (a percentage or a dollar amount) with an optional second one stacked on top, and an optional tax rate to land on the real total. Shoppers, household budgeters, and businesses setting their own prices all benefit from seeing the genuine number.

Everything starts from the original price. Percentage discounts are applied one after another against the current running price rather than the original figure, which mirrors how stacked deals really behave: 20% off, then an additional 10% off the already-reduced amount. If you've entered a sales tax rate, it's calculated on that final discounted price and added on to produce the total.

Stacking trips people up constantly. It is tempting to read 20% and 10% as a flat 30% off, but that math is wrong and always overstates the savings, since the second cut comes off the lower price, not the sticker. Tax treatment is another regional wrinkle: some places tax before discounts and some after. This tool applies sales tax once every discount has been taken.

Example: A Smart Display with Two Stacked Discounts

  1. 1 A smart display is priced at $799.99. The store offers 15% off, you have an extra 5% loyalty coupon, and sales tax is 7.5%. Enter 15% as the discount, turn on the stacked discount at 5%, and enter 7.5 for sales tax.
  2. 2 First discount: $799.99 × 0.15 = $120.00, leaving $679.99. Second discount: 5% of $679.99 = $34.00, leaving a sale price of $645.99.
  3. 3 You save $154.00 in total, an effective discount of 19.25% (shown as 19.3%), not 20%. Tax on the sale price is $48.45 ($645.99 × 0.075), for a total after tax of $694.44.
  4. 4 The calculator applies tax once, after both discounts. Stacking the two cuts saves $6.00 less than a flat 20% off would ($160.00).

Source: BLS · Last updated: September 2026

Frequently Asked Questions

How do I calculate the price after a percentage discount?
Multiply the original price by (1 minus the discount percentage). For a 25% discount on a $80 item: $80 x 0.75 = $60. Or calculate 25% of $80 ($20) and subtract it.
How do stacked discounts work?
Stacked discounts are applied sequentially, not added together. A 20% discount followed by a 10% discount is not 30% off. On a $100 item: 20% off = $80, then 10% off $80 = $72. The total discount is 28%, not 30%.
Is sales tax calculated before or after the discount?
Sales tax is calculated on the discounted (final sale) price, not the original price. If an item is 30% off from $100 to $70, sales tax applies to $70.

You might also need

Cost of Living Comparison — Salary Equivalency by US City

Compare cost of living between US cities and see the salary needed to maintain your lifestyle when relocating. Free, instant results for any US metro area.

Tip Calculator

Calculate tip amount and split the bill between multiple people. Quick preset tip percentages for restaurants and services.

Unit Converter

Convert between units of length, weight, temperature, volume, area, and speed.