Free Sales Tax Calculator
Add sales tax to a price, or work backward from a tax-included total to find the original pre-tax price — both directions, instantly.
Whether you're quoting a client a tax-inclusive price or need to figure out how much of a receipt total was tax, this calculator does both directions: forward (price → total with tax) and reverse (total → pre-tax price and tax amount), for any tax rate you enter.
$
%
Total with tax
$108.25
Price$100.00
Tax rate8.25%
Tax amount$8.25
Frequently asked questions
Can it calculate tax in reverse from a total?
Yes — enter a tax-included total and your tax rate to see the pre-tax price and the tax amount.
Does it support different tax rates by state or country?
You can enter any tax rate manually; state/country-specific rate lookup is on our roadmap.
Is this useful for invoicing?
Yes — many freelancers use it to double-check the tax line on a quote or invoice before sending it.
Is it free to use?
Yes, unlimited and free with no signup.