Load & Demand Calculators

Assess maximum demand with diversity factors, balance three-phase loads, correct power factor, and convert electrical units — all per BS 7671 IET Wiring Regulations.

1. Maximum Demand Calculator

Sum connected loads to determine total maximum demand

Quick-add preset circuit:

Circuit Name	Load	Unit	Qty

2. Diversity Calculator

Apply BS 7671 Appendix A diversity factors to reduce maximum demand

3. Three-Phase Load Balancing

Distribute single-phase loads across L1, L2, L3 to minimise imbalance

4. Power Factor Correction

Calculate capacitor bank size to improve power factor

5. Ohm's Law / Power Converter

Enter any two values to calculate the rest, plus kW/kVA conversions

Study BS 7671 On the Go

Prepare for the IET Wiring Regulations exam with 580+ practice questions, topic guides, and more.