Terms of use
Last updated 19 September 2026.
Service
AmpSize is a free set of cable sizing and electrical calculators for New Zealand and Australian practice. If you use the site, you accept these terms. We can change the calculators, the data or these terms at any time. We can take the site offline without notice.
No warranty
Each result is a design aid, not a design. We supply results as is, without warranty of any kind. Verify each result against the current standard and the installation conditions before you rely on it.
In New Zealand, a licensed electrical worker must do, test and certify electrical work. That person is responsible for the design, the inputs entered here and the work itself. To the extent the law allows, AmpSize accepts no liability for loss, damage or injury that results from use of this site.
Standards content
AmpSize does not reproduce the standards. It stores derived data and citations only, so you can trace a result to its clause or table. The standards remain the property of Standards New Zealand and Standards Australia. You need your own licensed copy to check a result against the source.
Accounts
You do not need an account to use the calculators. Your inputs are in the page URL. If you share a link, you share the inputs in it.
An account lets you save calculations, group them into projects and add your branding to PDF reports. You sign in with Google or with a link we email to you. You are responsible for what you save. We can close an account that abuses the service.
Pro plan
Pro is a paid subscription, billed monthly or yearly in New Zealand dollars. Lemon Squeezy is the merchant of record and handles payment, tax and refunds under its own terms. You can cancel at any time from your account page. Pro features stay active until the end of the period you paid for. The free plan stays free.
Governing law
New Zealand law governs these terms. The New Zealand courts have exclusive jurisdiction.