Cable Size Calculator

A cable size calculator based on BS 7671 for calculating cable sizes for a variety of different cable types and installation methods.

PC Version

Based on BS 7671
Calculate cable size mm²
Save or print the calculation results

Carry out cable size calculations on the go.

Optimised for iPad, iPhone, Android Phones and Android Tablets

Cable Calculator Calculations

Step 1 – Enter the circuit parameters.

Carry out instant cable size calculations in two simple steps.

Enter a circuit reference (optional).
Enter a circuit description (optional).
Enter the design current.
Enter the length of circuit.
Enter the supply Uo voltage (Live-Earth voltage).
Enter the supply Ze or Zdb value.
Select the required maximum volt drop value.
Select the earthing type.
Select a protective device.
Select the protective device rating.
Select a cable type.
Select the required maximum disconnection time.
Next.

Cable Calculation – Step 2

Step 2 – Installation methods and correction factors.

The offered installation method options will depend on the selected cable type.

Select an installation method.
Select the ambient temperature (Ca).
Select the number of cables grouped (Cg).
Select the extent of cable that is covered by thermal insulation (Ci).
Calculate.

The demo video may not reflect the current version of the app.

Demo video

Cable Calculation – Results

A table of results is displayed for the cable calculation results which can also be printed or saved as a PDF file.

Print or save the calculation results

When you select to print or save the calculation results you are prompted to enter the following optional inputs which will be printed to the results file.

Sign the document with the on screen signature pad.
Enter your name.
Enter the client name.
Enter the installation address.

What people think about this app…

Excellent

Great fast calculating tool very accurate.

dayo17

iOS

Great App

I personally have not had a problem with this app. It’s a really useful app for those who want to check cable requirements on the fly.

DJ Edison

iOS

Best cable calc

Been using it for about a month now and it’s been brilliant Best cable calc I’ve found by far.

Rob White

Android

The Best

By far the best I have used.

Sam Watson

Android

Summary of Features

Calculates cable size
Calculates circuit R1+R2
Calculates circuit Zs
Calculates circuit volt drop
Multiple cable types
Multiple installation methods
Enter circuit number (optional)
Enter circuit description (optional)
Sign the document (optional)
Enter the installation address (optional)
Enter the client name (optional)
Save or print the results

Cable calculation software based on BS 7671.

Get the App

Download the Cable Calculator app and start calculating cable sizes today.