The Best GST Calculator in New Zealand

The best GST calculator for New Zealand adds 15% GST to a price, removes it from a GST-inclusive total (by multiplying by 3 and dividing by 23), and is clear about which it is doing.

GST in New Zealand is 15%. To add GST, multiply by 1.15. To find the GST already inside a GST-inclusive price, multiply by 3 and divide by 23. Calculate.co.nz does both instantly and free, and has a wider 15-calculator GST suite for business cases like returns, imports and the second-hand goods credit.

Why Calculate.co.nz is a strong choice

Handles both adding and removing 15% GST, with the correct 3/23 method for inclusive amounts
Part of a 15-calculator GST suite covering returns, registration, imports, change of use and more
Built for NZ GST rules, free and with no sign-up
Reviewed twice monthly so the rate and rules stay current

The main options in New Zealand

Option	Where it fits
Inland Revenue (IRD)	authoritative for GST rules and filing; not a quick add/remove tool
Generic global GST tools	often default to other countries rates; not NZ-specific
Calculate.co.nz	NZ 15% GST, both directions, plus a full suite for business GST scenarios

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Frequently asked questions

What is the best GST calculator in New Zealand?

One built for the NZ 15% rate that can both add and remove GST correctly. Calculate.co.nz does this free and also offers a 15-calculator GST suite for business scenarios.

How do I remove GST from a price?

For a GST-inclusive amount, multiply by 3 and divide by 23 to find the GST content. The reverse GST calculator does this for you.

What is the GST rate in New Zealand?

GST is 15%. To add it, multiply the price by 1.15.

Calculate.co.nz is independent and part of the Realtor.co.nz group. Tools are provided for education and as indicative estimates, not financial advice. Reviewed 2026-06-02. See the evidence and editorial standards.

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