01 — Ranking
Other free options, ranked
Google Search calculator
google.com
4.4Type '80 - 25%' into Google and get the answer at once.
- Best for
- Quick one-off discount checks on your phone.
- Free plan & limits
- Free with no setup. Stacked discounts and tax need you to chain the calculations yourself.
Calculator.net Discount Calculator
calculator.net
4.1Calculates percentage or fixed-amount discounts.
- Best for
- Comparing a percentage discount with a fixed amount off.
- Free plan & limits
- Free with no account. The site shows ads, and it handles one discount at a time.
Omni Calculator (Discount)
omnicalculator.com
4.2Discount calculator that can solve for the original price.
- Best for
- Finding the original price from a sale price and a discount percentage.
- Free plan & limits
- Free with no account. The site shows ads.
Phone calculator
support.apple.com
3.8The calculator app already on your phone.
- Best for
- Shopping offline.
- Free plan & limits
- Free and works offline. You have to remember the formula: price × 0.75 for 25% off.
02 — Comparison
Side by side
Scroll sideways to see every tool. The first column stays pinned.
| Feature / Criterion | This calculator | Google Search | Calculator.net | Omni Calculator |
|---|---|---|---|---|
| Stacked discounts | Yes | Manual | No | No |
| Sales tax | Yes | Manual | No | Yes |
| One-tap common discounts | Yes | No | No | No |
| Reverse (find the original price) | No | Manual | No | Yes |
| Ads | No | Search ads | Yes | Yes |
03 — Guide
How to calculate a discount step by step
Convert the percentage to a decimal
25% off means you pay 75%, so multiply by 0.75. For 30% off, multiply by 0.70.
Multiply the original price
$80 × 0.75 = $60. You save $80 − $60 = $20.
Apply stacked discounts one after another
An extra 10% off applies to the already reduced price: $60 × 0.90 = $54. The total discount is 1 − (0.75 × 0.90) = 32.5%, not 35%.
Add sales tax last
In most US states, tax applies to the discounted price: $54 × 1.0725 = $57.92 at a 7.25% rate. Coupons from manufacturers can be taxed differently, depending on the state.
04 — FAQ
Common questions
How do I calculate 20% off a price?
Multiply the price by 0.8. For example, 20% off $45 is 45 × 0.8 = $36, and you save $9. A quick way to do it in your head: 10% is the price with the decimal point moved one place left ($4.50), so double it for 20% ($9).
Are two discounts added together?
No. Discounts compound: 50% off plus an extra 20% off is 60% off in total (0.5 × 0.8 = 0.4 left to pay), not 70%. Retailers use stacked offers because they sound bigger than they are.
How do I find the original price from the sale price?
Divide the sale price by (1 − discount). If an item costs $63 after 30% off, the original price was 63 ÷ 0.7 = $90.
Is this discount calculator free?
Yes. It is free, has no ads and needs no sign-up. All calculations run in your browser.
Scores reflect our own assessment of free-tier value. Prices and limits change, so check them on each provider's site before you buy.