Sales Tax Calculator

Sales Tax Calculator is a free browser-based tool that helps you calculate inclusive or exclusive sales tax with quick rate presets. It is part of ToolsMonk's business tools collection, so you can finish the job without downloading software, creating an account, or jumping between multiple websites.

This tool is especially useful for workflows such as adding sales tax to a price for invoicing or quoting, working out the pre-tax base inside a tax-inclusive total, and checking the tax portion of a receipt. Because it runs directly in your browser, you can use it on desktop, tablet, or mobile while keeping the process fast and easy for one-off tasks as well as repeat work.

Sales Tax Calculator is designed for people who want a practical, privacy-friendly workflow with instant results inside the larger ToolsMonk library.

Sales Tax Calculator adds tax to a price or extracts it from a tax-inclusive total, showing the base amount, the tax, and the total separately — for invoicing, quoting, and checking receipts.

Adding tax is straightforward, but reversing it is where people slip up. Because the tax was applied to the smaller base rather than the inclusive total, you can't simply subtract the percentage from the total — that removes too much. The correct method is dividing by (1 + rate), which the 'remove tax' mode does for you.

Rates vary by jurisdiction and sometimes by product, so entering the correct local rate is essential for an accurate figure, whether you're dealing with US sales tax, VAT, or GST. Keeping the tax shown separately also keeps invoices and records clean.

Everything runs in your browser, so your figures stay private. Pair it with the GST and other ToolsMonk finance calculators for the rest of your pricing and tax maths.