Sales Tax Calculator

Add a sales tax rate to a subtotal to see the tax amount and final total.

Usage Tip

For a tax-inclusive price, divide the total by (1 + tax rate) to get the subtotal.

Total With Tax
— total
Subtotal plus tax
THE MATH
total = subtotal × (1 + tax%)
Tax amount = subtotal × tax rate; the total adds it on top.
Sales tax rates vary by region and item; enter the rate that applies to you.
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The calculators and tools on Formula Factory are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. Formula Factory makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.