Wireman

For electricians · iPhone · US NEC

Electrical calculations.
The work shown.

Size wire, check voltage drop and find NEC references—even without a signal. Save the job and share your work with Pro.

Download on the App StoreSee jobs & reports ↓

Nine free calculators. More tools and job reports with Pro.

Wireman Wire Size calculator showing a 20 amp copper circuit and a 12 AWG result
20 A copper example, 60°C termination limit. Actual app screen; NEC 2023 basis.
15 common calculatorsOffline calculations & referenceNo account or adsNEC 2023 reference

All 15 electrical calculators.

Everyday electrical calculations, with the inputs and working shown. All tools work offline; code-based results use the stated NEC 2023 basis.

Nine free calculators

Included with Wireman

  • Wire Size

    Size copper or aluminum conductors with ampacity, temperature, bundling and termination limits.

  • Circuit Sizing

    Work from the load to a breaker, conductor and equipment grounding conductor.

  • Voltage Drop

    Calculate voltage drop and find a wire size for your target drop.

  • Conduit Fill

    Check THHN conductor fill for EMT, PVC Schedule 40 and RMC conduit.

  • Conduit Bending

    Lay out offsets, three-bend saddles and stub-ups with bend marks and shrink.

  • Box Fill

    Calculate required box volume for conductors, grounds, clamps and devices.

  • 3-Phase Power

    Calculate single- or three-phase current, apparent power and real power using power factor.

  • Ohm’s Law

    Solve for voltage, current, resistance and power from two known values.

  • Conversions

    Convert horsepower to kilowatts and Celsius to Fahrenheit.

Six more with Pro

Worked examples are free to explore

  • Motor Circuit

    Look up motor full-load current and size branch conductors, protection and equipment ground.

  • Transformer

    Use transformer kVA and voltage to calculate full-load current and a primary fuse estimate.

  • Fault Current

    Estimate available short-circuit current from transformer kVA, voltage and impedance.

  • Dwelling Load

    Estimate a dwelling service load using supported NEC Article 220 inputs and demand factors.

  • EV Charger

    Size an EV charging branch circuit, breaker, conductor and equipment ground.

  • Grounding

    Size equipment grounding and grounding electrode conductors with NEC 2023 tables.

WIREMAN PRO

From a calculation
to a job report.

Keep the inputs with the answer. Pick up where you left off.

Save calculations to named jobs. Reopen and edit the inputs, or make a copy for the next run.

Select the results you need and export a PDF with the working, notes and references. It works offline, too.

Open a sample PDF report

Example report. No signup needed.

Wireman Jobs showing Garage renovation, two saved calculations, Edit calculation and Duplicate actions, and a PDF report button
Actual app screen · example job and calculations.
Jobs and custom PDF exports require Pro.

Worked examples

Understand the answer.

Three practical guides, with the assumptions, calculation steps and actual Wireman results.

Put the working in your pocket.

The tools you need, ready when you need them.

Get Wireman on the App Store

For iPhone · iOS 15 or later · English

NEC 2023 reference tool. Verify against your adopted code and local amendments. Details & support.