Sales Tax Calculator
Add sales tax to a price, or reverse-calculate the price before tax from a tax-included total.
Sales tax rates vary by U.S. state, county, city, and country — enter your local rate rather than a rate you find elsewhere, since this tool doesn't assume or look up any specific rate for you.
How to Calculate Sales Tax
- Choose "Add Tax to a Price" if you have a pre-tax price, or "Find Price Before Tax" if you only know the total.
- Enter your price (or total) and your local tax rate as a percentage.
- Read the tax amount and the other price instantly — both update live as you type.
- If you have multiple stacked tax rates (state + city, for example), add them together first and enter the combined rate.
Frequently Asked Questions
What tax rate should I enter?
Enter your local sales tax rate — this varies by US state, county, city, and country, so this tool doesn't assume or pre-fill any specific rate. Check your receipt or your local tax authority's website if you're not sure what rate applies to you.
How does the reverse calculation work?
If you know the total price you paid including tax, enter it in the 'Total Price' field along with the tax rate, and the tool divides the total by (1 + tax rate ÷ 100) to back out the pre-tax price, then subtracts that from the total to show the tax amount.
Does this handle multiple tax rates stacked together, like state plus city tax?
Yes, as long as you combine them into a single rate first — add your state, county, and city rates together and enter the combined percentage in the Tax Rate field.
Why do my numbers update as I type instead of needing a button?
The calculator recalculates instantly on every keystroke so you can see how the tax amount and total change in real time as you adjust the price or rate.
Is my price or purchase information saved anywhere?
No — everything is calculated locally in your browser and nothing you enter is sent to a server or stored.