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Sales Tax Calculator

Add a sales-tax rate to a pre-tax amount.

Enable JavaScript to use this calculator. Your inputs stay in this browser.

Formula / Calculation Method

Tax = pre-tax amount × tax rate / 100.

Example Calculation

100 with 8% sales tax produces 8 tax and 108 total.

Understanding the Result

Enter the applicable combined rate. Local exemptions and rounding rules may differ.

What is the Sales Tax Calculator?

Add a sales-tax rate to a pre-tax amount.

How to Use

Enter the taxable amount before tax and the combined applicable percentage.

Select Calculate after entering your values. Text tools update as you type. Reset restores the starting fields.

Interpreting the Calculation

The tax result is added to the original amount. Some jurisdictions use multiple taxes, exemptions or per-item rounding; this is a single-rate estimate.

Common Questions

Can this extract tax from a tax-inclusive price?

No. This tool adds tax to a pre-tax amount. To recover a pre-tax price, use Reverse Percentage with 100 plus the tax rate.

What assumptions does this tool use?

Enter the applicable combined rate. Local exemptions and rounding rules may differ.

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