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GST / VAT Calculator
Add or remove tax instantly.
Work out GST/VAT on a net amount, or find the tax already included in a gross amount.
Add Tax
Start from a net amount and calculate the tax-inclusive total.
Remove Tax
Start from a gross amount and back out the original net value.
Free & Unlimited
No signup, no watermarks, no limits. Use it as many times as you like.
What is a GST / VAT Calculator?
A GST/VAT calculator helps you quickly add tax to a net amount or work out how much tax is already included in a gross (tax-inclusive) amount. It works with any percentage rate, so it applies to GST, VAT, sales tax, or any similar percentage-based tax.
How to use this calculator
- Enter your amount.
- Enter the tax rate as a percentage.
- Choose whether your amount is tax-exclusive (Add Tax) or tax-inclusive (Remove Tax).
- Click Calculate to see the net amount, tax amount, and gross amount.
Frequently Asked Questions
Adding tax starts from a net (tax-exclusive) amount and calculates the tax on top to get the gross total. Removing tax starts from a gross (tax-inclusive) amount and works backward to find the original net amount and the tax portion already included in it.
Yes. Enter whatever tax rate applies in your country or region (for example 5%, 15%, or 20%) and the calculator applies the same standard add/remove tax formula.
Yes. 100% free — no account required, no watermarks, no usage limits.