Sales Tax Calculator

Add sales tax to a price — or work backwards from a receipt total to the pre-tax amount. · used 1 times

Stays on your device. This tool runs in your browser — nothing you paste or open ever leaves it. Nothing uploaded, nothing to leak.

Mode

Tax rate

Before tax

Sales tax

Total

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How to use it

Choose Add tax to put tax on top of a pre-tax price, or Remove tax to work backwards from a tax-inclusive total. Enter the amount and your rate — rates vary by state, county and city, so use the combined rate that applies where the sale happened. The result shows the pre-tax amount, the tax, and the total.

Sales Tax Calculator — TechWhack Score

9.5/10

Privacy 10/10

Calculated in your browser — your amounts are never sent anywhere.
Speed 10/10

Both directions update as you type.
Features 8/10

Adds tax to a price or works backwards from a tax-inclusive total, with the pre-tax amount, the tax and the total all shown.
Free 10/10

No sign-up, no limit, embeddable.

Verdict: The reverse mode divides by 1 + the rate rather than taking the rate off the total — the exact mistake that overstates the tax on every receipt you split by hand.

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A sales tax calculator works in both directions. Add tax to a pre-tax price to get the total you will pay, or run it in reverse: enter a receipt total and the rate, and it separates the original price from the tax. Reverse mode is the one people usually need — it is how you split a total for expenses or bookkeeping when the receipt only shows the final figure.

Calculating sales tax backwards

To find the pre-tax price from a total, divide the total by 1 plus the rate as a decimal: at 8% that is total ÷ 1.08, so $108 came from $100 plus $8 of tax. The common mistake is taking 8% of the total instead, which overstates the tax — 8% of $108 is $8.64, not $8. This tool does the division for you.

FAQ

Can it work out the tax from a total?Yes — switch to Remove tax, enter the tax-inclusive total and the rate, and it returns the pre-tax price and the tax paid.

Which rate should I use?The combined rate for the location of the sale — state plus any county and city tax. Rates differ across the US, so check the rate that applies to you.

Does it handle any tax rate?Yes — enter any percentage, including fractional rates like 8.25%.