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Discount Calculator — % Off, Sale Price, Original Price

Three modes in one tool: calculate the sale price after % off, the discount % from sale vs original, or the original price from sale price + % off. Optional sales tax.

$
%
%

You pay

$80.00

Original price$100.00
Discount20.0%
You save$20.00
About this tool

Catch the fake "50% off" tricks

Stores love to inflate the "original" price so the discount looks bigger. Use mode 2 to back-calculate the actual discount % when you know both prices, and mode 3 to check whether a discounted price still beats elsewhere on the original. Sales tax can be added optionally.

How to use the Discount Calculator

Takes about a minute. No signup, no download, your data stays in your browser.

  1. 1
    Open the tool. Scroll up to the Discount Calculator above — it loads instantly in your browser, no install needed.
  2. 2
    Enter your values. The fields come pre-filled with realistic defaults so you can see how it works — replace them with your own numbers.
  3. 3
    Read the result. The output updates instantly. Copy or share it — nothing is uploaded to a server, everything stays on your device.

Frequently asked questions

Common questions about the Discount Calculator.

Is the Discount Calculator free to use?

Yes. The Discount Calculatoron 7BusyBoss is completely free — no signup, no paywall, no usage cap. We do recommend paid alternatives in a sidebar card, but the core tool stays free.

Do I need to sign up to use the Discount Calculator?

No. The Discount Calculatorworks instantly in your browser — no account needed. Signing in with Google is optional and only unlocks features like saving favorites and higher AI build limits.

Does the Discount Calculator work on mobile?

Yes. Every tool on 7BusyBoss is mobile-responsive and works in any modern browser — Chrome, Safari, Firefox, Edge — on phones, tablets and desktops.

Is my data safe when I use the Discount Calculator?

Yes. The Discount Calculatorruns entirely in your browser — your inputs never leave your device unless the tool explicitly fetches public data (e.g. currency rates). We don't store the values you type.

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