Calculators
About the Discount Calculator
The Discount Calculator is a free online calculator from Toolbench. Sale price after one or two stacked discounts, with optional tax. Enter your numbers and the answer — with the formula used — updates as you type.
- Category
- Calculators
- Price
- Free
- Account
- Not required
- Runs
- Entirely in your browser
How to use the Discount Calculator
- Enter the values (original price, discount %, extra discount % (stacked), sales tax %).
- Read the result — it updates as you type.
- Check the breakdown rows to see exactly how it was calculated.
Worked example
| Original price | 80 |
|---|---|
| Discount % | 25 |
| Final price | 60.00 |
| You save | 20.00 |
| Effective discount | 25% |
| Price after first discount | 60.00 |
| Tax | 0.00 |
Formula: Stacked discounts multiply rather than add: 20% then an extra 10% off is 1 − 0.8 × 0.9 = 28% off, not 30%.
Inputs
| Original price | Default: 80 |
|---|---|
| Discount % | Default: 25 |
| Extra discount % (stacked) | Default: 0 |
| Sales tax % | Default: 0 |
Privacy
Everything runs in your browser: what you type or paste is processed by JavaScript on your device, not on a server. If you are signed out, nothing is saved at all. If you sign in with Google, your inputs and settings are saved privately to your account so they sync across devices.
Frequently asked questions
Is the Discount Calculator free?
Yes. Discount Calculator is completely free with no sign-up, no usage limits and no watermarks.
Is my data private?
Yes. The Discount Calculator processes everything in your browser. Signed out, nothing is saved; signed in, your inputs sync privately to your own account.
How does the discount calculation work?
Stacked discounts multiply rather than add: 20% then an extra 10% off is 1 − 0.8 × 0.9 = 28% off, not 30%.
Does it work on my phone?
Yes. Toolbench runs in any modern browser on desktop, tablet or phone — there is nothing to install.
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