Sales Tax Calculator
Use Sales Tax Calculator to add tax to a subtotal — free, immediate, and with nothing to install. Every figure is worked out on your own device using standard formulas — nothing you type is transmitted, which matters when the numbers are your salary, loan or health data. It is used most by people comparing loan or mortgage options before talking to a lender. Figures are indicative — they are not financial, medical or legal advice. Nothing is gated: no signup wall, no trial period, no upgrade prompt.
Key features
- Figures are indicative — they are not financial, medical or legal advice.
- Both metric and imperial units are supported where relevant.
- Works on desktop, tablet and phone — no separate app to install.
- Loads in under a second and gives its result in one action.
How to use Sales Tax Calculator
- Enter your figures: Fill in the fields above. Leave anything optional blank and a sensible default is used.
- Pick your units: Switch between metric and imperial if the calculation involves units.
- Read the result: The answer updates immediately, with the breakdown shown so you can check the working.
Frequently asked questions
- How accurate is Sales Tax Calculator? — Sales Tax Calculator uses the standard published formula for this calculation with full double-precision arithmetic, so the arithmetic itself is exact. Accuracy of the answer depends on the figures you enter.
- Is there a limit on how often I can use it? — No. It is free and unlimited, with no account required.
- Why does my answer differ from another site? — Usually a different formula variant or rounding step. Check the inputs match before assuming one is wrong.
- Does it support metric and imperial? — Yes, where the calculation involves units you can switch between them and the result converts with you.