GST Calculator

Add GST to an ex-GST amount or remove GST from a GST-inclusive total. Works for any GST rate worldwide — Australia, New Zealand, Canada, India and more.

What Does This Tool Do?

Add GST to a price (ex-GST → incl-GST) or remove GST from a total (incl-GST → ex-GST). Supports any GST rate for Australia, NZ, Canada, India and other countries.

Key Features

➕
Add GST
Calculate GST-inclusive price from ex-GST amount.
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Remove GST
Extract GST from a GST-inclusive total.
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Any Rate
AU 10%, NZ 15%, CA 5%, IN 18% and any custom rate.
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Formula
Calculation steps clearly shown.

How to Use

  1. Select Add GST or Remove GST.
  2. Enter the amount and the GST rate.
  3. Click the button to see the breakdown.

Frequently Asked Questions

What GST rate should I use?▾
Australia: 10%. New Zealand: 15%. Canada: 5% federal GST (or 13%/15% HST). India: 5/12/18/28% depending on goods. UK uses VAT at 20%.
How do I remove GST from an inclusive price?▾
Ex-GST = Total ÷ (1 + rate/100). This is sometimes called "backing out" the GST.
Is the GST inclusive amount always larger?▾
Yes — the GST-inclusive amount is always the ex-GST amount plus the GST portion.