Sales Tax Calculator

Use this free sales tax calculator to estimate tax amount and final total from a subtotal and local sales tax rate.

All tools

Formula steps Estimate limits shown Examples included Private history

Subtotal ($)Sales tax rate (%)

Total after sales tax$86.00

$80 at 7.5% sales tax

Tax amount: $6.00
Subtotal: $80.00
Rate used: 7.5%

Formula steps

Convert 7.5% to decimal rate 0.075.
Multiply subtotal by the rate to find tax amount.
Add tax amount to subtotal for the final total.

How to use the sales tax calculator

Enter the requested dollar amounts, rates, terms, tax settings, or contribution details.
Use rates as percentages, such as 6.5 for 6.5%, and check whether a field asks for a monthly or annual amount.
Press the calculate button to see the answer, supporting metrics, and formula steps.
Use the result as a planning estimate only, then copy it if the assumptions look right.

Common uses

Estimate sales tax before checkout.

Convert a subtotal and tax rate into a final total.

Check receipt math or split a purchase with tax included.

Use a manual local rate when exact tax lookup is not needed.

Examples

Simple total $80 at 7.5%

$6 tax, $86 total

Large purchase $1,200 at 6.25%

Estimated tax and total

Receipt check $42.50 at 8.2%

Tax amount and final total

Frequently asked questions

Quick answers about formulas, rates, payment assumptions, estimate limits, examples, and private in-browser history.

What can I use the Sales Tax Calculator for?

Use it for quick planning, comparison, and what-if estimates before you check exact numbers with a lender, tax professional, payroll provider, or financial adviser.

How does the Sales Tax Calculator calculate the result?

The calculator multiplies subtotal by the sales tax rate, then adds the tax amount to the subtotal for the final total.

Is this financial, tax, or legal advice?

This is a manual-rate estimate. It does not look up local rates, exemptions, shipping rules, marketplace rules, or tax holidays.

Are my finance inputs private?

Yes. The calculator runs in your browser tab. Recent answers stay only on the page while you use it and are not sent to a server.