Electrical & Wiring Calculators

Our electrical and wiring calculators help you size cables correctly, check voltage drop compliance, and pick the right conductor for the job — all based on BS 7671 (IET Wiring Regulations 18th Edition).

Whether you are running a new ring main, adding a cooker circuit, or wiring outdoor lighting, these tools take the guesswork out of cable selection by factoring in installation method, ambient temperature, circuit grouping and cable run length.