Calculate

GST Calculator

Enter an amount and GST rate, then choose whether the amount excludes or includes tax to see the net, GST, and gross figures. Calculated locally.

Details

Local

Result

Net amount
—
GST amount
—
Gross total
—
FAQ

Common questions

“Add GST” treats your amount as the net (pre-tax) figure and adds tax. “Remove GST” treats your amount as the gross (tax-inclusive) figure and works backwards to the net.
Net = Gross ÷ (1 + rate/100); GST = Gross − Net.
Yes — the maths is identical to VAT; just enter your VAT rate.
No. All calculation happens in your browser.

Related tools

Age Calculator

Calculate exact age in years, months, and days from a birth date, with leap-year accuracy.

Launch tool

Percentage Calculator

Work out percentages, percentage of a number, and what percent one value is of another.

Launch tool

Percentage Change Calculator

Calculate percentage increase or decrease between an old and a new value.

Launch tool
Private by design

This runs entirely in your browser

No file or text you enter here is uploaded. Encoding and decoding happen on your device using native browser APIs — close the tab and nothing remains on a server.

Install Toolisco Add it to your device for offline, one-tap access.