AmpSize.nz
Free cable size calculator and electrical calculators for NZ and Australia. Voltage drop, maximum demand, loop impedance and more, to AS/NZS 3008 and 3000.
Free cable size calculator and electrical calculators for NZ and Australia. Voltage drop, maximum demand, loop impedance and more, to AS/NZS 3008 and 3000.
This page is designed to help you find out whether AmpSize.nz is good and if it is the right choice for you.
AmpSize is a set of 44 free electrical calculators for electricians, engineers, estimators and apprentices in New Zealand and Australia. Size a cable to AS/NZS 3008.1.2 (NZ) or AS/NZS 3008.1.1:2025 (AU), check voltage drop, maximum demand, earth fault loop impedance, fault ratings, conduit fill and fire alarm loads, and read the clause and table behind every figure. Nothing needs an account. A Pro plan (NZ$5 a month or NZ$45 a year) adds unlimited saved calculations, projects and branded PDF reports. Built in New Zealand.
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New Zealand focus
The .nz domain suggests the site is aimed at New Zealand users. If so, it may reflect local standards, regulations, suppliers, and pricing. I could not open the site, so please confirm this on the site itself.
Specialized niche tool
The name suggests a tool for sizing something related to amps, such as cables, circuit breakers, or electrical loads. A single-purpose tool like that is usually quicker than a general reference. This is inferred from the name, not verified.
Likely quick and simple to use
Small, focused calculator or sizing sites usually have minimal interfaces and give fast answers without a steep learning curve. I have not confirmed that this applies to AmpSize.nz.
Potential cost savings
Many niche online sizing tools are free or low-cost compared with consulting a specialist for basic estimates. Check the site's pricing and terms to see if this holds.
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