Sales Tax Calculator
Calculate sales tax two ways: add tax to a known pre-tax price, or work backward from a tax-inclusive total to find the original price and tax amount.
How It Works
The calculation, explained
Add mode: total = amount × (1 + rate). Extract mode: pre-tax price = amount ÷ (1 + rate), with the tax amount as the difference. See our Sales Tax on Invoices guide for how to find the correct rate for your state.
FAQs
Common questions
Does this account for different tax rates by state or country?
No — enter the specific rate that applies to your transaction; rates vary widely by jurisdiction and even by product category.
What’s the difference between the two modes?
Add mode is for pricing you set before tax; extract mode is for figuring out the tax embedded in a price that’s already tax-inclusive.
Beyond The Calculator
Turn this into a real invoice.
Use the full generator to build a proper, line-itemized invoice — free, no signup.