Electrician Calculator Pro 4+

Roberto Chavarria Marin

Designed for iPhone

    • 2.3 • 3 Ratings
    • $14.99

iPhone Screenshots


Electrician Calculator Pro - National Electrical Code (NEC) compliant calculator for electricians, engineers and electrical professionals, electrical contractors, designers, lighting experts, inspectors, maintenance personnel and builders!

Forget about complicated key combinations normally required for NEC calculators! With this app you'll be able to perform the following calculations in a straightforward way:

---- Features ----
• Compliant with NEC 2020, 2017, 2014, 2011, 2008, 2005 and NEC 2002, and future updates are FREE!

---- Voltage Drop ----
All voltage drop calculations use NEC chapter 9 table 8 values (either stranded or unstranded), and ambient temperature is taken into consideration as per NEC chapter 9 table 8 FPN 2.

• Find voltage drop (in volts and percentage).
• Find the maximum cable length given a required voltage drop and wire gauge (for single and three phase circuits).
• Find the minimum wire gauge given a required voltage drop and distance (for single and three phase circuits).

---- Ampacity ----
Ampacity calculations use NEC tables 310.16 and 310.17 to find maximum ampacity or minimum wire gauge. The correction factor for temperature is used in these calculations.

• Find the minimum wire gauge given an amps value and ambient temperature (can specify if it will be in a raceway or free air).
• Find the maximum ampacity of a cable given its gauge, the ambient temperature, and if it is in a raceway or free air.

---- Conduit sizing and conduit fill ----
Conduit and cable diameters are obtained from the tables in NEC chapter 9. Maximum fill percentages are obtained from NEC chapter 9 table 1.

• Find the minimum size conduit given the gauge and number of cables.
- Can specify the following conduit types: EMT, ENT, FMC, IMC, LFNB, LFNA, RMC, PVC-80, PVC-40 / HDPE, PVC-A, PVC-EB.
- Can specify the following insulation types: THHN, THWN, THWN-2, THW, THHW, THW-2, TW, XHH, XHHW, XHHW-2, RHH, RHW, RHW-2.
• Find the maximum amount of cables that can be used, given conduit size and type, and cable gauge and insulation.

---- Motor full load current ----
Motor full load current values are obtained from NEC tables 430-247, 430-248, 430-250 in chapter 9.

• Find the motor full current load for DC motors, single phase, squirrel cage, wound rotor, and synchronous electrical motors from 1/4HP to 200 HP.

---- Grounding conductor ----
Find the grounding conductor for service entrances and equipment, as per NEC tables 250-66 and 250-122.

---- Capacitor KVARs ----
Find the capacitor KVARs that must be connected to the system in order to correct low power factors caused by inductive loads.

---- Power cost ----
Estimate the financial cost of running a specific load. You enter your KWH rate, the load in KW, and the hours spent with the load connected, and the calculator will return the cost. You can select your own currency from the Preferences section.

---- Preferences ----
The app preferences will allow you to choose to enter Values can be entered in Feet or Meters, Celsius or Fahrenheit. You can also select to use copper or aluminum cables by default, and select to use stranded or unstranded cables.

---- Support ----
If you are not 100% satisfied with this calculator please email us at info@electriciancalculator.com so we can answer your question or comment before posting any negative reviews. We are constantly providing updates and adding new functionality. Planned updates include bend radius calculations, grounding, circuit breaker selection and more.

Note: This product is not associated with Electrician Talk, Calculated Industries, ElectriCalc, ElectriCalc Pro, nor with Electrical Calc Elite. NEC is a registered trademark of the National Fire Protection Association (NFPA).

What’s New

Version 4.0

Updated to include National Electrical Code (NEC) versions 2017 and 2020!

Ratings and Reviews

2.3 out of 5
3 Ratings

3 Ratings

vr6nation ,

Waste of money

This app is garbage. Half the functions don’t work. You’re better off using the calculator on your phone

nixtr ,

Works well in field

Nice app for field work. It does the thinking for me. Only reason for 4 stars is it defaults to 18 ga wire. No electrician in the world uses anything smaller than 14 ga for NEC work.

LaMayita ,

Loooooooooooooved it!!!!!!

Nice app, easy to use and includes the latest NEC.

App Privacy

The developer, Roberto Chavarria Marin, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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