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Free Sales Tax Calculator

Add sales tax to any amount, or reverse it out of a total. Enter your own state or local rate, no lookups, no signup. Rates change and vary by location, so confirm yours with your state before filing.

🔒 Private by design. Your numbers never leave your browser, nothing is uploaded or stored.

Mode Pre-tax amount ($) Sales tax rate (%)

Tip: 8.25% is Texas’s common combined rate as an example. Enter your own state/local rate.

Sales tax

$82.50

Pre-tax$1,000.00

Total$1,082.50

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FAQ

Questions

How do I calculate sales tax?+

Multiply the pre-tax amount by the tax rate as a decimal. For example, $1,000 at 8.25% is $82.50 tax, $1,082.50 total. This tool does it both ways, including working backward from a total.

How do I find the tax inside a total?+

Switch to reverse mode. The tool divides the total by 1 plus the rate to find the pre-tax amount, then shows the tax portion.

Do sales tax rates vary?+

Yes. Rates differ by state, county and city, and change over time. Always confirm your current combined rate with your state before filing.

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Book a free consultation and we will help you track, separate and file sales tax correctly so it is never a surprise.

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