Electrician Calculator

Electrician Calculator is a pocket calculator for electricians who work to BS 7671 (UK) or NEC (US). Pick your region once, then size cables and check runs on site. UK, labelled to BS 7671:2018+A4:2026 (Amendment 4) • Cable sizer: enter Ib, In, reference method, ambient, grouping and length. Get the smallest cable where Iz covers In and voltage drop is within the limit. • Voltage drop from Table 4D1B, with lighting (3%) and other uses (5%) limits • Cable derating and current capacity from Table 4D1A with Ca, Cg and Ci US, NEC • Wire sizer with continuous loads, terminal ratings, 240.4(D) small conductor limits and 3% voltage drop • Voltage drop using the K-factor method • Wire ampacity with ambient correction and conductor adjustment • Conduit fill and box fill Every result shows its working. Share it, or save it to a job. Electrician Calculator Pro is a one-time purchase that adds: • Unlimited cable sizer (the free version includes 3 sizes) • Every saved result, grouped by job (the free version opens the newest 3) • PDF job reports to send or keep with your paperwork Paths the app does not cover, such as UK conduit fill, 90°C thermosetting and aluminium Iz, twin and earth tables and earth fault loop impedance, are left out rather than guessed. Use the IET On-Site Guide and the full standards alongside the app and your own judgement on site. Support: [email protected]