Sales Tax Calculator

Add tax to a net price or extract included tax from a gross price.

Your inputs

Calculated in your browser. Your inputs stay on this device.

Starting values are examples. First click or keyboard focus clears an example so you can enter yours. Reset restores the examples.

Your result

Enter your values to calculate.

Compare scenarios

Keep up to three results and their inputs during this visit. Reset clears the comparison.

Behind the answer

Gross = net × (1 + rate); net = gross ÷ (1 + rate)

How to use this calculator

Add tax, remove included tax or solve the effective tax rate from known before- and after-tax prices. Enter the applicable rate yourself rather than relying on an outdated jurisdiction table.

Enter price mode, price, tax rate (%) and review the remaining options.
Select Calculate or change a value to update the result. Read the result label and units before copying.
Use Reset to restore the worked starting values.

Formula and method

Gross = net × (1 + rate); net = gross ÷ (1 + rate)

One tax rate only. Jurisdiction-specific exemptions, compounded taxes, and invoice-rounding rules are excluded.

Worked example

100 before 8% tax gives tax 8 and total 108.

Questions about sales tax calculator

How do I recover the pre-tax price from a total?

Select Tax already included and divide the gross price by 1 plus the tax rate as a decimal. For 108 including 8% tax, the net price is 100 and included tax is 8. Local exemptions and multiple tax layers are not modeled.

What assumptions should I check?

One tax rate only. Jurisdiction-specific exemptions, compounded taxes, and invoice-rounding rules are excluded.

Are my inputs saved?

Calculations run in your browser. We store only tool IDs for favorites and recent tools. A calculation link contains your inputs only when you explicitly choose to copy one.