About the Tax Percentage Calculator
Find the tax rate that was applied from the pre-tax and post-tax price, or from the tax amount.
Also known as: find tax rate, what percent is tax, tax rate from total.
How to use this calculator
- Enter price before tax, price after tax.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
Rate = (after − before) ÷ before × 100
Worked example
Using the values pre-filled in the calculator above:
- Price before tax = 50
- Price after tax = 54.13
the calculator returns:
- Tax rate: 8.26%
- Tax amount: 4.13