Free online calculator
Sales Tax Calculator
Add a user-entered sales tax rate to a taxable price. Includes a worked example, formula and practical FAQs.
Formula: Sales tax = pre-tax price × tax rate
How to use the Sales Tax Calculator
Add a user-entered sales tax rate to a taxable price. Confirm the applicable rate and taxable base separately before using the result.
Formula
Tax = price × rate / 100; total = price + tax.
Worked example
A $100 taxable price at an illustrative 8% rate adds $8 tax, making a $108 total.
Interpretation and limitations
The rate is an input, not a location-based tax lookup. Exemptions, shipping taxability, multiple jurisdictions and rounding rules are outside this arithmetic tool.
Sales Tax questions
Does the calculator determine my tax rate?
No. Obtain the applicable rate from the relevant authority or your verified tax settings.
Can I remove tax from a tax-inclusive total?
Use the tax-inclusive price calculator. Multiplying the total by the tax rate does not correctly recover the included tax.
Continue your calculation
For the next step, use the Tax-Inclusive Price Calculator or the VAT Calculator. Review each tool’s input definitions before carrying a result into another calculation.
Frequently asked questions
Is this calculator free?
Yes. It runs in your browser and does not require an account.
How should I use the result?
Use the result as a planning estimate and verify business-critical decisions against your source records.