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Sales Tax & Price Calculator

Add sales tax to net prices or reverse-calculate pre-tax amounts from gross totals.

Quick Answer:Multiply net price by the sales tax rate to find tax (Price × Rate). To reverse tax from a total, divide total by (1 + Tax Rate).

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How to Use the Sales Tax Calculator: Add Tax or Reverse Calculate Price

1Select whether you want to add tax to a net price or reverse-calculate tax from a gross total.
2Enter your monetary purchase amount.
3Input the applicable state and local sales tax rate percentage.
4Read the calculated tax dollar amount and total purchase cost.

Formula & How It Works

Sales Tax Computation Formulas

Total = Price × (1 + Rate) | Pre-Tax Price = Total / (1 + Rate)

Forward addition and backward tax extraction formulas.

Worked Examples

Adding 8.25% Sales Tax to a $100 Purchase

Input: Amount: $100.00, Rate: 8.25%, Mode: Add Tax

Explanation: $100 × 0.0825 = $8.25 sales tax, resulting in a total payment of $108.25.

Result: Sales Tax: $8.25, Total Price: $108.25

Frequently Asked Questions

How do you reverse sales tax from a receipt total?▼

Divide the receipt total by (1 + tax rate in decimal). For example, at 8.25% tax, divide $108.25 by 1.0825 to get exactly $100.00 net price.

Which US states have no statewide sales tax?▼

Alaska, Delaware, Montana, New Hampshire, and Oregon do not levy a statewide sales tax, although local municipal jurisdictions in Alaska may impose local taxes.

Are shipping fees subject to sales tax?▼

Taxability of shipping charges varies by state. In many states, if shipping is bundled or required for delivery, it is taxable.

Is food from grocery stores subject to sales tax?▼

Most states exempt unprepared groceries and prescription medications from standard state sales tax, while prepared restaurant meals are taxed.

Quick Reference & Conversion Table

Net Amount	6.0% Tax	7.0% Tax	8.25% Tax	9.5% Tax
$20.00	$1.20	$1.40	$1.65	$1.90
$50.00	$3.00	$3.50	$4.13	$4.75
$100.00	$6.00	$7.00	$8.25	$9.50
$250.00	$15.00	$17.50	$20.63	$23.75

⚠️ Common Pitfalls to Avoid

•Attempting to extract tax by subtracting (Total × Tax Rate), which understates the true pre-tax baseline.
•Forgetting that sales tax rates combine state, county, and municipal local tax percentages.

💡 Practical Real-World Uses

•Auditing merchant invoices and restaurant check receipts.
•Accounting bookkeeping to separate sales revenue from sales tax collected on behalf of the state.

Last reviewed & updated: 2026-11-11

Free & Open Access

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