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.
➖
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.

Complete Guide to GST Calculator

When To Use This Tool

Use GST Calculator whenever you need fast, accurate output without installing software. This tool is designed for speed, clarity, and repeatable results for day-to-day work.

Best Practices for Accurate Results

  • Double-check the format of your input before running the tool.
  • Test with a small sample first, then process larger data.
  • Use Related Tools to verify, convert, or transform the output.

Why Users Prefer AdeDX

AdeDX tools are browser-based, free to use, and built to work across desktop and mobile devices. Most processing happens directly in your browser for fast performance and improved privacy.