Fault Current Calculator (PFC)

Pro Certs Software Ltd

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About this app

Fault Current Calculator for Android, the fast, free tool electricians trust to calculate Prospective Fault Current (PFC), Prospective Short Circuit Current (PSCC) and Prospective Earth Fault Current (PEFC) on site, in seconds.

Enter any two values, Voltage, Loop Impedance (Zs/Ze) or Fault Current and the app instantly calculates the third.

KEY FEATURES

PSCC & PEFC Calculations
Calculate Prospective Short Circuit Current (L-N or L-L) and Prospective Earth Fault Current (L-E) instantly.

Single Phase & Three Phase
Full support for both single phase and three phase fault current calculations.

Solve for Voltage, Zs or PFC
Enter any two known values and the calculator works out the third automatically.

Loop Impedance (Zs/Ze) Calculator
Quickly calculate earth fault loop impedance from the voltage and PEFC.

Formula Shown
See the exact formula used for every calculation, so you can check and understand your results.

100% Offline
No signal, no problem. Calculate fault current anywhere — roof spaces, basements, plant rooms.

Dark Mode
Easy on the eyes for site work in low light.

16 Languages
Fully translated for electricians worldwide.

Fast & Free
Clean, simple interface built for speed — get your answer and get back to work.

Whether you're testing PSCC, PEFC, earth loop impedance or general prospective fault current on an installation, this calculator gives electricians, contractors and engineers a quick, reliable way to check figures on the go — ideal for periodic inspection and testing, EICRs, and new installation certification.

Electrical PFC fault current calculator for Android. Calculate to or from PFC, voltage or earth loop impedance, enter any two values to calculate the third.

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Trusted by electricians since 2011.

Ratings and reviews

Constantly keeps asking for a review when I try use the app even tho I've reviewed the app numerous times did start with 5 stars now down to 1

what a great app allows a quick easy way to calculate the psc from loop readings great for design work and testing

Very handy app, works great.

What’s new

26/07/2026 v1.4.8
- In-app optimisations
- Faster app launch time