← All posts

Sales Tax Calculator: Add or Remove Tax from Any Price

Tooly · 2026-08-02 · 5 min read

Sales tax math is the most error-prone calculation in everyday money: add 8.25% to a price, or work backward from a total to find the pre-tax amount. A sales tax calculator does both instantly, for any rate — no signup, nothing uploaded.

Two ways to calculate tax

• Add tax — price × (1 + rate). A $100 item at 8% → $108 total
• Remove tax — total ÷ (1 + rate). Paid $108 at 8% → $100 pre-tax

Calculate sales tax free with Tooly

The Tooly Sales Tax Calculator handles both modes:

• Enter the price and your tax rate
• Toggle between Add Tax and Remove Tax
• See the exact tax amount and final (or pre-tax) total instantly
• Free, no signup, runs in your browser

When you'll use it

• Invoices — add the right tax to every line item
• Reimbursements — pull the pre-tax amount out of a receipt
• Budgeting — know the real total before you buy
• Bookkeeping — separate tax from revenue (pair with BankToCSV for statement reconciliation)

Quick reference (add tax)

Price	6%	8%	10%
$50	$53.00	$54.00	$55.00
$100	$106.00	$108.00	$110.00
$250	$265.00	$270.00	$275.00

Frequently Asked Questions

Is this sales tax calculator really free? Yes — unlimited calculations, no account, no watermark.

What rate should I use? Your combined state + local rate. US averages range from under 5% to over 10% depending on location.

Is my data private? Everything runs in your browser — your numbers never leave your device.

What else should I check? The Discount Calculator and Percentage Calculator cover the surrounding math.

← Back to all posts