Sales Tax Calculator

What this calculator does

The Sales Tax Calculator helps you move between net and gross prices. Enter an amount, set the tax rate, choose whether you want to add tax or extract it, and the tool will calculate the before-tax amount, tax amount, and final total instantly.

Add and extract modes

Use add mode when you know the original price before tax and want to see the tax and final charge. Use extract mode when the amount already includes VAT, GST, or sales tax and you need to separate the taxable base from the tax portion.

When it is useful

• Preparing invoices, quotes, and checkout pricing.
• Verifying supplier totals and tax-inclusive receipts.
• Checking per-item tax when selling multiple units.
• Quick bookkeeping and ecommerce price checks.

Limitations to keep in mind

This calculator assumes a single flat tax rate applied once. It does not model stacked taxes, tax exemptions, shipping rules, or discounts that affect the taxable base, so use your final billing policy whenever those conditions apply.