Comparison

2017 Master Electrician Ref. vs Electrical Motor Calculator

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

2017 Master Electrician Ref.

This digital handbook provides electricians and related professionals with essential electrical formulas, diagrams, and reference tables. It offers calculations, a dictionary of terms, and detailed information on wiring, motors, transformers, and more, all accessible on a mobile device.

Highlights
  • Electrical formulas and calculations
  • Wiring diagrams for various systems
  • Motor and transformer specifications
  • Conductor and ampacity tables
  • Dictionary of electrician terms
  • NEMA standards and diagrams
  • Math and conversion tools
Features
Read full description

Master Electrician Reference (or MER for short) 2017 is your electronic pocket electrician reference guide. MER is for electrical designers, engineers, installers, contractors, facility managers, inspectors, exam candidates, apprentices, electricians, journeymen, architects, and technicians. MER is for people doing residential, industrial, and commercial work. Simply, if you are a Master Sparky or work with electricity in any way, this reference guide is for you! Have you ever lost pages or had damaged pages in your pocket electricians reference? The solution is here: Use MER to keep the most important information easily accessible on your iPhone, iPod Touch, or iPad. MER will even do calculations for you; something your old pocket reference book can't do. MER is divided into the following sections: * Simple Circuits - Ohm's law, series and parallel circuits, capacitance, inductance, impedance, and reactance. * Distributed Systems - Distribution wiring diagrams for 120, 208, 277, and 480 volts, color codes, breaker sizes, light switches and bells diagrams. * Electrical Formulas - Formulas for kVA, kW, and HP. * Color Codes - Color codes for capacitors and resistors. * Motors and Wiring - Standard motor and motor starter sizes, tables of full-load currents, locked-rotor information, overload units, OCPD, nameplate information, synchronous motor speeds, three-phase STAR and DELTA diagrams, three-wire start-stop diagram, motor frame dimensions, and motor enclosure types. * Transformers - KVA ratings for single- and three-phase current, transformer formulas. * Conductor Properties - Conductor tables, AWG and metric wire sizes, twist-on pressure connectors, and wire combinations. * Ampacities - Ampacities in raceway, cable, earth, and free air, and derating tables. * Conduit Fill table * Grounding Sizes - Equipment grounding conductor (EGC) and grounding electrode conductor (GEC). * Metal Boxes - Images and sizes of metal boxes, junction / device boxes, junction / pull boxes. * Voltage Drop calculations * Dictionary of electrician terms * Insulation Charts - Table of cable and wire types * Electrical Symbols * NEMA - Plugs and wiring diagrams, enclosure types, standard underground boxes, standard fuse and breaker sizes, standard pull box / junction sizes, standard gutter and wire-ways, standard switchboards, standard busway, standard busbar ampacity, standard panelboard sizes, and standard disconnect sizes. * Math and Conversions - Formulas for algebra, geometry, fractions, temperature conversion, trig tables, unit conversions, metric prefixes, and conversions between inches and millimeters. * Conduit Bending - Includes the guide "The Master Bender Way" on how to bend conduit. See the Master Bender app or MasterBender.com website for more information. * Conduit Weights * Copper Wire Cost * Hole Saw Sizes * Material Raceway Support * Lighting - Fluorescent, high-intensity discharge, incandescent, LED, and low-pressure sodium. * Standard Tool List * Torque - Lugs, bolts, and screws, tightening torque. * Dry, Damp, and Wet Locations * Hazardous Locations * Wiring Methods * Safety - Lock-out / tag-out (LOTO), and a safety manual and first aid. Most pages contain a general scientific calculator. It is expression based: Just enter an expression and evaluate it. It understands trig and power functions, can convert between radians and degrees, and has built-in basic constants like pi and e. MER includes key NEC tables from the National Electrical Code (NEC) 2017. We also have MER apps available for NEC 2011 and NEC 2014 code years. Visit our website at MasterSparky.com for more information.

About

Electrical Motor Calculator

This engineering tool calculates key electrical motor characteristics like amps, horsepower, and kVa. Input system voltage, motor efficiency, and power factor to determine electrical values for your system.

Highlights
  • Calculate amps, horsepower, and kVa
  • Input system voltage and motor efficiency
  • Converts kilowatts to horsepower
  • Defines Power Factor (PF) and Full Load Amps (FLA)
  • Calculates Running Load Amps (RLA)
Features
Read full description

Electrical Motor Calculator is an engineering tool to calculate amps, horsepower, kilowatt and kVa base on electrical motor formula. Electrical Motor Calculator calculated values and are intended for use as a means of indicating expected values for electrical motor and similar product. Values will vary in service with load conditions, condition, age and type of motor. Electrical Motor Calculator lets you figure out electrical characteristics of your system given a specific motor. By inputting horsepower, kilowatt, motor efficiency, power factor, and system voltage the system will calculate the amps, horsepower, kilowatt and kVa. PF - Power Factor - three phase motors (0 - 100%) or (0.0 - 1.0) FLA - "Full Load Amps" - the amount of current when a motor is at its full rated output power. FLA is the running load + 25%. RLA - "Running Load Amps" - current drawn during normal operation of electric motor. 1 kVA = 1,000 volt amps Kilowatts to horsepower conversion 1 HP = 0.7457 kW 1 kW = 1.34102 HP Thanks for your support and do visit nitrio.com for more apps for your iOS devices.

Screenshots

2017 Master Electrician Ref.4 screens
Electrical Motor Calculator4 screens

Verdict

The call

The clearest difference is rating: 2017 Master Electrician Ref. at 4.7 against Electrical Motor Calculator's 3.8. 2017 Master Electrician Ref. also leads on update cadence (every 5 months vs every 43 months) and ratings volume (1.3K vs 8). Electrical Motor Calculator's advantage is price ($2.99 vs $9.99). On ads, in-app purchases, monetization model and chart position there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

2017 Master Electrician Ref. costs $9.99 and Electrical Motor Calculator $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

2017 Master Electrician Ref. holds the better App Store score, 4.7 against 3.8. That said, the two scores are not equally well evidenced: 2017 Master Electrician Ref. has 1.3K ratings behind it against 8, so its average is the more settled of the two.

UpkeepUpdate frequency

2017 Master Electrician Ref. ships an update every 5 months, Electrical Motor Calculator every 43 months. The most recent releases landed on September 22, 2026 and September 21, 2026 respectively.

Scorecard4 real differences · 7 level
2017 Master Electrician Ref. versus Electrical Motor Calculator: the parameters behind the verdict, then further details
Parameter2017 Master Electrician Ref.Electrical Motor Calculator
Price$9.99$2.99 — better
Rating4.7 (1.3K ratings) — better3.8 (8 ratings)
Positive reviews66.7% of reviews—
Number of ratings1.3K — better8
Update frequencyEvery 5 months — betterEvery 43 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
Best chart rank#101 — better#174
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better13
Further details — not scored
Size46 MB1 MB
Age rating12+4+
DeveloperPawEng, LLCHeng Jia Liang

Customer experience

2017 Master Electrician Ref.

All ratings1,255 ratings
Positive92.7%
Neutral3.4%
Negative3.9%
Written reviews24 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

Electrical Motor Calculator

All ratings8 ratings
Positive62.5%
Neutral12.5%
Negative25.0%

Bugs and requests

2017 Master Electrician Ref.

Reported bugs

3 issues
  • Conduit fill information missing for certain types
  • Login screen freezes
  • Compatibility issues with older devices

Requested features

3 requests
  • Update to latest NEC code
  • Add calculation tools for conduit fill and voltage drop
  • Improve user interface and navigation

Electrical Motor Calculator

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

2017 Master Electrician Ref.

No in-app purchases

None

Electrical Motor Calculator

No in-app purchases

Questions

Is 2017 Master Electrician Ref. free?
2017 Master Electrician Ref. costs $9.99, with no in-app purchases.
Is Electrical Motor Calculator free?
Electrical Motor Calculator costs $2.99, with no in-app purchases.
Which has better reviews, 2017 Master Electrician Ref. or Electrical Motor Calculator?
2017 Master Electrician Ref. is rated higher. 2017 Master Electrician Ref. averages 4.7 out of 5 from 1.3K ratings, while Electrical Motor Calculator averages 3.8 from 8 ratings.
Do 2017 Master Electrician Ref. or Electrical Motor Calculator have ads?
Neither 2017 Master Electrician Ref. nor Electrical Motor Calculator shows ads.
Which is updated more often, 2017 Master Electrician Ref. or Electrical Motor Calculator?
2017 Master Electrician Ref. ships an update every 5 months, and Electrical Motor Calculator every 43 months. Most recently, 2017 Master Electrician Ref. was updated on September 22, 2026 and Electrical Motor Calculator on September 21, 2026.
Which is more popular, 2017 Master Electrician Ref. or Electrical Motor Calculator?
2017 Master Electrician Ref. currently peaks at #101 in the App Store charts, and Electrical Motor Calculator at #174. Chart position reflects recent download velocity rather than total install base.

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