Electrician Calc: Wire & Load

⚡ Electrician Calc: Wire & Load is an offline electrical calculator for wire size, voltage drop, load calculation and conduit fill. Every answer shows the formula with your own numbers — not just a number.

Most electrical calculator apps hand you a figure and expect you to trust it. That works until an inspector asks how you got there, or you check your own work before pulling 200 feet of cable.

🔧 CALCULATORS FOR THE WHOLE JOB

✅ Wire size calculator with ambient temperature and conductor bundling derating

✅ Voltage drop calculator — percent drop, volts dropped and voltage at the load

✅ Maximum run length and minimum conductor size for a drop limit you set

✅ Conduit fill calculator and box fill calculator

✅ Dwelling load calculation, feeder load and service size

✅ Parallel conductor runs, sized properly rather than refused

✅ Power loss in cables, cable operating temperature, busbar ampacity

✅ Cable tray fill, design current, neutral current with harmonic content

✅ Motor full load current and motor branch circuit sizing

✅ Ohm's law, power triangle, three phase power, power factor correction, short circuit

✅ Transformer sizing, breaker and fuse sizing, equipment grounding conductor

✅ Delta star conversion, RMS and peak, Ah to kWh, 4-20 mA signal scaling

✅ Voltage divider, resistor and capacitor networks, resonant frequency, LED resistor

📐 SHOWS THE WORKING, CITES THE ARTICLE

Every result lays out the formula, substitutes your values step by step, and names the NEC article behind it. Answers are colour coded, so a run over the 3% drop the code notes recommend looks different from one that passes. You see the problem instead of reading past it.

📁 BUILT AROUND REAL JOBS

Calculations save to a named job and stay there. Export a whole job as a single PDF for a client, a contractor or an inspector — the shown working goes with it. History is kept, so nothing is lost when you close the app.

⚙️ SET IT UP ONCE

Set your usual system voltage, power factor, maximum voltage drop and ambient temperature, and every calculator opens pre-filled. Buy wire in AWG while measuring runs in metres — wire size, length and temperature units are set independently.

📚 OFFLINE REFERENCE LIBRARY

✅ IP, IK and NEMA enclosure ratings

✅ Breaker tripping curves, UL and IEC fuse classes, RCD types

✅ TT, TN-S, TN-C-S and IT earthing systems

✅ Plug and socket types and mains voltage by country

✅ EV charging connectors, NEMA configurations, IEC 60320 and IEC 60309

✅ ANSI device numbers, resistivity, E-series values, SI prefixes

✅ Wiring colour codes by region and conductor dimensions

🔌 PINOUTS AND MOTOR WIRING DIAGRAMS

RJ-45 and PoE, USB-C, HDMI, RS-232, XLR and DMX, OBD-II, ISO 10487 car audio, Raspberry Pi GPIO, SD and fibre colour codes — with colour swatches you can hold the cable against. Plus drawn 6, 9 and 12 lead motor connection diagrams for wye, delta and star delta starting.

👷 WHO IT IS FOR

Journeymen and master electricians sizing feeders, panels and services. Apprentices learning why the answer is the answer. Maintenance and controls techs scaling a 4-20 mA loop or landing a nine lead motor. Solar and EV installers. Anyone studying for a licensing exam who needs the method, not just an output.

📱 ALSO INSIDE

✅ Works fully offline — no signal needed in a basement or on a site

✅ Home screen widget and a quick settings tile

✅ Dark mode and Material You dynamic colour

✅ Settings backup and restore when you change phone

✅ Favourites, search and sort order so your daily tools stay one tap away

🔒 PRIVACY

Your calculations, jobs and history stay on your device. No account, no sign up, no cloud upload. The app requests no location, contacts or camera permissions.

⚠️ This app is a calculation aid. Always confirm results against the code edition adopted in your jurisdiction and with your authority having jurisdiction.

Download Electrician Calc: Wire & Load and get an electrical calculator that shows how it reached the answer. ⚡