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Sales Tax Calculator
Add sales tax to a price or strip it back out of a total. Pick a direction, enter the amount and rate, then press Calculate to see the net price, tax and gross total.
Written by TopicDrill Editorial Team·Updated June 2026
Where each dollar goes
Net price Sales tax
Net price
$100.00 (93.2%)
Sales tax
$7.25 (6.8%)
Total $107
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How the sales tax calculator works
The tool runs in two directions. In add tax mode it treats your amount as the price before tax, multiplies it by the rate to find the tax, and adds the two together for a gross total. In remove tax mode it treats your amount as a tax-inclusive total and divides by one plus the rate to recover the original net price.
The donut underneath splits every dollar of the total into the portion that is the product price and the portion that is tax. As the rate climbs, the orange tax slice grows, which is a quick way to feel how much of a receipt the tax really represents.
A quick example
A 100 dollar purchase at a 7.25 percent rate adds 7.25 dollars of tax for a 107.25 dollar total. Run it the other way and a 107.25 dollar tax-inclusive total divides by 1.0725, returning a 100 dollar net price and confirming the same 7.25 dollars of tax.
Things to keep in mind
Combined rates differ by state, county and city, and certain goods like groceries or prescriptions are often exempt or taxed differently. The USA.gov guide to state taxes points to each state authority for the exact figure. If you need to plan around income rather than purchases, see our income tax calculator.
Frequently asked questions
How do I add sales tax to a price?
Multiply the pre-tax price by the tax rate written as a decimal to get the tax amount, then add it back to the price. For a 100 dollar item at a 7.25 percent rate, the tax is 7.25 dollars and the total comes to 107.25 dollars. The calculator does this the moment you choose the add tax mode.
How do I remove sales tax from a total?
Divide the tax-inclusive total by one plus the rate as a decimal to recover the original net price, then subtract that from the total to find the tax. A 107.25 dollar receipt at 7.25 percent divides by 1.0725 to give a 100 dollar net price and 7.25 dollars of tax. This is the reverse, or remove tax, mode.
What sales tax rate should I enter?
Use the combined rate that applies where the sale takes place, which is often a state rate plus county or city add ons. Rates vary widely across jurisdictions and some items are exempt, so check the rate for the specific location and product category rather than assuming a single national figure.
Is sales tax the same as VAT?
They are related but not identical. Sales tax is charged once, at the final retail sale to the consumer. A value added tax is collected in stages along the supply chain, with businesses reclaiming the tax they pay. The arithmetic in this tool matches a single stage retail sales tax.
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