Ratio Calculator
Simplify a ratio and calculate each side as a share of the total.
Sales Tax Calculator
Add a percentage tax rate to a pre-tax amount.
About the Sales Tax Calculator
Add a percentage tax rate to a pre-tax amount. It runs entirely in your browser — nothing is uploaded to a server, so it is fast and private. Just use it and go.
How to use the Sales Tax Calculator
- Enter or paste your input into the tool above.
- Adjust any options to fit what you need.
- Copy or download the result.
Frequently asked questions
Is the Sales Tax Calculator free?
Yes. This tool is completely free to use, with no sign-up required.
Is my data safe?
Everything runs locally in your browser. Your input never leaves your device.