Sales Tax Calculator
Add sales tax to a price or work backwards from a tax-included total, at whatever rate applies in your state or city.
How to use it
- Pick add or remove, then enter the amount and your local rate.
- Rates differ by state, county and sometimes city — check your own before relying on the total.
- The reverse mode is useful for splitting a receipt total into goods and tax.
Examples
| 100 + 7% tax | Tax 7, total 107 |
| 107 including 7% tax | Net 100 |
US sales tax is added at the point of sale on top of the listed price, at a rate set by state, county and sometimes city — unlike VAT or GST, it's usually not baked into a displayed shelf price. This tool adds tax to a pre-tax amount for a checkout total, or reverses a receipt total back to the pre-tax price and the tax charged.
Worked example
A $100 item in a location with 7% sales tax: tax = 100 × 0.07 = $7, total = $107. Working backwards from a $107 receipt at the same rate: net = 107 ÷ 1.07 = $100 exactly — dividing by 1 + rate, not subtracting 7% from the total, which would incorrectly give $99.51.
Why rates vary so much
Sales tax in the US is layered — a state rate plus optional county and city rates stack on top, so the same purchase can be taxed differently a few miles apart. Some categories (groceries, prescription medicine, clothing in some states) are exempt or taxed at a reduced rate. Always confirm the local combined rate rather than assuming a single national figure — there isn't one.
Questions people ask
Why can't I just subtract the percentage to remove tax?
Because the tax was calculated on the smaller pre-tax figure, not the total. Divide by 1 + rate instead.
Is anything sent to a server?
No. Every calculation runs in your browser, so nothing you type is uploaded and the page keeps working offline once it has loaded.
Last updated 17 August 2026