Sales Tax Calculator
Enter a price and a tax rate to add tax, or enter a tax-inclusive total to work backwards to the pre-tax price.
Price & Tax Rate
Add sales tax to a net price or remove it from a tax-inclusive total, with the tax amount shown separately.
Formula
Add: gross = net × (1 + rate ÷ 100). Remove: net = gross ÷ (1 + rate ÷ 100); tax = gross − net.
Reference Values
- •Tax applies to the net amount, not the total
- •Removing tax requires division, not subtraction
- •VAT uses the same arithmetic
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FAQ
Common questions about Sales Tax Calculator
How we calculate this
We use the standard published formula for this calculation, and we show the working so you can check it.
Spotted a mistake? Tell us and we'll check it within a few days. See how we check our calculators.
Tax disclaimer
Tax rules change and depend on your circumstances. Use this as a guide, and confirm with official sources or an adviser.