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GST Calculator

Add or remove GST at any rate, with the net, tax and gross shown.

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Common rates

Gross (GST inclusive)

—

Net (before GST)—
GST amount—
CGST (half)—
SGST (half)—

CGST and SGST split the rate evenly for intra-state supply in India. For inter-state supply the whole amount is IGST instead.

Quick Tool Overview

The GST Calculator shows the net price, the GST component and the gross price together, at any rate. The direction toggle is the important control: adding GST to a net figure and stripping GST out of a gross figure are different sums, not the same one reversed.

What it does
Adds GST to a net amount or removes it from a gross amount
You give it
An amount, a rate and a direction
You get back
Net, GST and gross figures side by side
Best for
Invoicing, BAS and GST returns, quoting and bookkeeping
Calculators Free, unlimited use No sign-up Runs in your browser

About the GST Calculator

Enter an amount and a GST rate to see the net price, the GST component and the gross price together. The direction toggle is the important control: adding GST to a net figure and stripping GST out of a gross figure are different sums, not the same one reversed.

To add GST you multiply by one plus the rate. To remove it you divide by one plus the rate, because the tax is a percentage of the net price, not of the gross. Subtracting 10 percent from a GST-inclusive total under-reports the net by nearly one percent, which compounds fast across a set of invoices. Rate presets cover the common jurisdictions, and any custom rate can be typed in for slab systems such as India where 5, 12, 18 and 28 percent all apply depending on the goods.

Key features of the GST Calculator

Add and remove are separate sums

To add GST you multiply by one plus the rate; to remove it you divide by one plus the rate, because the tax is a percentage of the net, not the gross.

The error it prevents

Subtracting 10 percent from a GST-inclusive total under-reports the net by nearly one percent, which compounds fast across a set of invoices.

Rate presets

The common jurisdictions are one click away instead of typed each time.

Any custom rate

Slab systems such as India, where 5, 12, 18 and 28 percent all apply depending on the goods, are handled by typing the rate.

All three figures at once

Net, tax and gross are always shown together, which is exactly what an invoice line needs.

How to use the GST Calculator

  1. 1

    Choose add or remove

    Pick whether your figure excludes GST and needs it added, or already includes GST and needs it extracted.

  2. 2

    Set the rate

    Use a preset for your country or type a custom rate.

  3. 3

    Enter the amount

    The net, the GST and the gross are shown together, so you can copy whichever one the form asks for.

Frequently asked questions

Divide by one plus the rate. To strip 18 percent GST from 1,180, divide by 1.18 to get a net of 1,000 and GST of 180. Subtracting 18 percent would wrongly give 967.60.

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