Electrician Calculator: Wiring

Electrician Calculator packs 20 field-ready electrical calculators into one fast app: branch circuit sizing, wire size, voltage drop, conduit fill, box fill, motor FLA, grounding, bending and more. Every result shows how it was calculated, step by step, with its source table. Everything runs on the phone with no account; your inputs and saved jobs stay on it.

CORE TOOLS — FREE

✓ Branch circuit sizer — load in A, VA, W or HP → breaker, wire, voltage drop upsizing, ground upsized in proportion and the smallest EMT or PVC conduit
✓ Show your work — formula, your numbers with units, result and NEC or IEC table for each step; copy, share or save it
✓ Voltage drop — 1-phase, 3-phase and DC, 18 AWG to 2000 kcmil, Table 8 DC resistance, low-voltage presets, minimum voltage at the load
✓ Wire size — 60/75/90 °C or automatic per 110.14(C), Cu/Al to 2000 kcmil, 125% continuous load, parallel sets
✓ Conduit fill — 11 raceway types, THHN, XHHW, THW, RHH and bare copper, Note 7 rounding, nipples at 60%, 3 wire sizes mixed
✓ Box fill, motor FLA, conduit bending, derating, grounding (250.122 / 250.66) and panel schedule (up to 6 circuits)
✓ EV charger circuit, fault current, wire withstand, energy cost, unit converter, Ohm's law and resistor colour code
✓ NEC (NFPA 70) or IEC 60364 tables; new installs pick a default from your country
✓ 12 languages, and numbers typed with local digits work
✓ Share results as text, back up saved jobs, dark mode, big glove-friendly keys

FREE WITH ADS, PRO WITHOUT

The free version shows a banner on the home screen and, at most every few minutes, a full-screen ad after you save a job or leave a calculator. Ads come from Google AdMob and Unity Ads, which may use your advertising ID; where the law requires it you are asked for consent first (Settings › Pro & ads). Anonymous analytics and crash reports (never your figures) can be turned off in Settings.

Electrician Calculator Pro is a Google Play subscription (monthly, 3 months, or yearly with a free trial) or a one-time lifetime purchase. It removes all ads and unlocks:

★ Dwelling load calculation, transformer sizing and power-factor correction
★ Circuit compare: copper vs aluminum and 60 vs 75 °C side by side, plus a list of up to 20 circuits saved as one job
★ Conduit fill with up to 10 wire sizes in one conduit
★ Voltage drop with NEC Table 9 AC impedance, and panel schedules over 6 circuits
★ Unlimited saved jobs (free: 3) and PDF reports with the calculation steps

Not ready to subscribe? Watch a short video for 30 minutes of every Pro tool (ads stay on). Had the app before ads arrived? You keep Pro free on this install.

Requires Android 7.0 or newer.

SAFETY NOTE

All results are for reference only. Tables are quoted from NEC 2023 and IEC 60364-5-52; always verify against the code in force where you work and your authority having jurisdiction (AHJ) before installation. This app does not replace the code book or a licensed electrician.

Recent changes:
New in 1.8.0:
• Calculator keypad on every number field: work out a value with + − × ÷, then tap Use.
• Export all saved jobs to Excel (.xlsx), with a details sheet that splits each result line, or to CSV (Pro).
• Calculator screens no longer start under the title bar on some phones.