Calculators · Free to use
Sales Tax Calculator
Add sales tax to a price to get the tax amount and the final total.
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How to use the sales tax calculator
- 1Enter the pre-tax price.
- 2Enter the sales tax rate %.
- 3Read the tax amount and gross total.
This tool runs in your browser. The text, files and values you enter are not uploaded to our server.
About the sales tax calculator
A sales tax calculator adds a tax rate to a pre-tax price to return the tax amount and the gross total. Useful for quoting customers, checking receipts and back-of-envelope pricing across different jurisdictions.
Frequently asked questions
Is this tool free?
Yes — completely free, no signup, no watermark and no limits. Startup OG funds the site through its directory and partner program, not paywalled tools.
How do you calculate sales tax?
Tax = price × (rate ÷ 100); total = price + tax. A $100 item at 8.25% is $8.25 tax, $108.25 total.
How do I find the pre-tax price from a total?
Divide the gross total by (1 + rate ÷ 100). A $108.25 total at 8.25% implies a $100 pre-tax price.
What sales tax rate should I use?
It depends on the buyer’s jurisdiction — US rates combine state and local and vary widely. Use your applicable combined rate.