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Sales Tax Calculator

Add sales tax to a price, or strip it back out.

Calculators Reviews Free · no sign-up
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The working

Total with tax

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Price before tax—
Sales tax—
Combined rate—
Tax per item—
Tax as % of total—

Quick Tool Overview

The Sales Tax Calculator adds tax to a price or strips it back out of a tax-inclusive total, combining state, county and city rates. The reverse calculation is the one people get wrong, because removing eight percent means dividing by 1.08, not subtracting eight percent.

What it does
Adds sales tax to a price or removes it from a total
You give it
A price and a tax rate, or a total and a rate
You get back
The pre-tax price, the tax amount and the total
Best for
Pricing, expense claims and checking a receipt
Calculators Free, unlimited use No sign-up Runs in your browser

About the Sales Tax Calculator

Enter a price and a tax rate to get the tax amount and the total. Switch the mode and it works backwards instead, taking a tax-inclusive total and separating out the pre-tax price and the tax within it, which is the calculation people get wrong most often.

The reverse calculation is not simply subtracting the percentage. To remove eight percent tax from a total you divide by 1.08 rather than multiplying by 0.92, and those give different answers. The calculator also lets you enter state and local rates separately and combines them, since in most of the United States the rate that actually applies is the sum of several jurisdictions and the combined figure is rarely the one advertised.

Key features of the Sales Tax Calculator

Reverse calculation done right

Removing tax means dividing by one plus the rate — subtracting the percentage gives a different and wrong answer.

Combined rates

State, county and city rates entered separately and added, since the combined figure is what actually applies.

Tax shown separately

The tax amount as its own line, which is what expense claims and bookkeeping need.

Works on any rate

Not limited to a preset list, so it handles special district rates and non-US rates alike.

Instant recalculation

Change any field and every figure updates, with no submit step.

How to use the Sales Tax Calculator

  1. 1

    Choose a direction

    Add tax to a pre-tax price, or remove tax from a total that already includes it.

  2. 2

    Enter the amount

    The price before tax, or the tax-inclusive total, depending on the mode.

  3. 3

    Set the tax rate

    A single combined rate, or separate state, county and city rates that are added together.

  4. 4

    Read the breakdown

    The pre-tax price, the tax amount and the total are shown separately.

Frequently asked questions

Multiply the pre-tax price by the tax rate as a decimal to get the tax, then add it to the price. A hundred dollar item at eight percent carries eight dollars of tax and totals a hundred and eight.

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