Sales Tax Calculator

Add sales tax to a net price or extract the tax already included in a gross price.

Add or remove sales tax

What are you entering?

Amount

Sales tax rate (percent)

Net before tax: —

Sales tax: —

Gross with tax: —

Tax as a share of gross: —

Adding twenty percent to a net price of 100 gives 120 gross, and removing it from 120 gives 100 net.

Common questions about the free online sales tax calculator.

Choose the mode that adds tax, enter the net price and the tax rate, and the gross price including sales tax is shown.

Choose the mode that removes tax and enter the gross amount, then the tool divides by one plus the rate to find the net price.

Subtracting the rate from a gross figure is wrong, because the tax was charged on the smaller net amount and not on the total.

Net is the price before tax and gross is the price after tax, so the gross amount always equals net plus the sales tax.

Use the rate that applies where you are buying, whether that is a single state rate, a city rate or a combined total rate.

Yes. A zero rate leaves the amount unchanged and reports no tax at all, which suits tax-free goods and services.

That would make the divisor zero, so the tool clears the results instead of trying to divide a number by zero.

The tax is shown to two decimal places, which matches the way most tills, invoices and receipts round the amount.

Yes. It is completely free, works offline after loading and never sends your figures to any server.

Last updated: October 10, 2026