FIRSTCALC by Firstflex Cables provides a variety of calculation tools to assist in sizing or selecting an appropriate cable.

FIRSTCALC by Firstflex Cables is a free App providing Electrical Contractors, Designers, Electricians and Lighting Specialists with a variety of calculation tools to assist in sizing or selecting an appropriate cable.

In order to calculate the most suitable cables FIRSTCALC requires that load current, length, volt drop %, phase, fixed or flexing, core type and installation conditions are specified in Cable Selection, it then provides a results page with a list of the most appropriate Firstflex cables to meet those requirements.

The results can be saved to “My List” and stored there to be reviewed later and/or can be emailed on with an attached datasheet.

In addition to Cable Selection, there are other tools provided to calculate Voltage Drop, Length, Load Current, Motor Current and KVA to Amps.

A Chemical Rating guide is also included to provide guidance on selecting equipment for appropriate chemical compatibility.

For more information on Firstflex Cables visit

Please note calculations provided are based on New Zealand standards and may not be suitable outside of New Zealand.

What’s New

Version 1.0.12

We've added the new ON cable series and updated some other cable information.

Ratings and Reviews

5.0 out of 5
1 Rating

1 Rating

App Privacy

The developer, Firstflex Cables Ltd., has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer's privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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