# Electronic Formulator

> Electronic Formulator (iPhone/iPad app by Historycentral.com Inc.)

- Source: https://appshunter.io/ios/app/electronic-formulator/id675036997 (this page in markdown: same URL + `.md`)
- Developer: [Historycentral.com Inc](https://appshunter.io/developer/1744330560)
- Category: Productivity, Business
- Price: Free
- Age rating: 4+
- Requires: iOS 26.2 · 19 MB
- Languages: American English
- Released: 2013-07-24
- Data updated: 2026-05-15
- User reviews in markdown: https://appshunter.io/ios/app/electronic-formulator/id675036997/reviews.md

## What is Electronic Formulator?

Electronic Engineer puts over 1,100 formulas and 24
  reference tables in your pocket. No internet required. No ads. Just fast,
  accurate calculations when you need them.

  POWERFUL CALCULATORS
 Solve real-world electrical problems instantly:

  • Ohm's Law — Voltage, current, resistance, and power calculations
  • Voltage Divider — Output voltage, resistor values, current, and power
  dissipation
  • Three-Phase Power — Balanced systems, Wye and Delta connections
  • LED Circuits — Series resistor selection, power dissipation, max LEDs in
  series
  • 555 Timer — Astable and monostable modes with frequency, duty cycle, and
  timing
  • RLC Circuits — Resonant frequency, Q factor, bandwidth, impedance, and
  reactance
  • Power Triangle — Real, reactive, and apparent power with PF correction
  sizing
  • Impedance & Resistance — AC/DC circuit analysis
  • Star-Delta Conversion — Transform between Y and Δ configurations
  • Wheatstone Bridge — Unknown resistance and unbalanced bridge voltage
  • Inductors — Reactance, energy storage, series/parallel, and time constants
  • Wire Sizing — Circular mils, voltage drop (single and three-phase)
  • Capacitors, Transformers, Motors, Batteries, UPS, Lighting, and more

  PRO CALCULATORS Unlock advanced tools for professionals:

  • Op-Amp Circuits — Inverting, non-inverting, differential, and voltage
  follower
  • Filter Design — RC and RL low-pass, high-pass, and bandpass filters
  • PCB Trace Width — IPC-2221 current capacity and trace resistance
  • Skin Effect — Depth calculations for copper and custom conductors

  24 REFERENCE TABLES

  Instantly look up critical data — no more flipping through handbooks:
• AWG Wire Gauge — Diameter, area, resistance, and ampacity
  • NEC Ampacity Table — 60°C, 75°C, and 90°C conductor ratings
  • Resistor Color Codes — 4-band and 5-band decoding
  • Standard Resistor Values — E12, E24, E48, and E96 series
  • Circuit Breaker Sizes — Amp ratings, wire sizes, and typical applications
  • Wiring Color Codes — NEC, IEC, and Australian standards
  • Logic Gates Truth Tables — AND, OR, NAND, NOR, XOR, XNOR
  • Transformer Connections — Delta, Wye, Scott-T, Zig-Zag, and more
  • Power Factor Reference — Typical PF for motors, lighting, drives, and loads
  • SI Prefixes — From tera to femto with electronics examples
  • Conductor Properties — Resistivity, conductivity, and temp coefficients
  • Common Semiconductor Pinouts — BJTs, MOSFETs, regulators, 555, 741
  • NEMA Enclosure Types — Indoor/outdoor ratings with IP equivalents
  • IP Protection Ratings — Solids and liquids protection levels
  • Ampacity Derating Factors — Temperature and conduit fill corrections
  • Standard Capacitor Values — Ceramic, film, and electrolytic
  • Cable Types — THHN, THWN, NM-B, MC, UF-B, and more
  • Decibel Reference — Power and voltage ratios at a glance
  • Motor Frame Sizes, Fuse Classes, Conduit Fill, and more

  UNIT CONVERSIONS  Over 400 conversion formulas across 19 categories including metric, linear,
  liquid, cubic, pressure, weight, flow, BTU, horsepower, watts, joules,
  frequency, and HVAC. Plus 8 temperature scales: Celsius, Fahrenheit, Kelvin,
  Rankine, Réaumur, Delisle, Newton, and Rømer.

  BUILT FOR YOUR WORKFLOW

  • Favorites — Star the calculators you use daily for one-tap access
  • Calculation History — Every result saved automatically for easy reference
  • Export & Share — Send results to colleagues or save for documentation
  • Search & Filter — Find any formula or reference table in seconds
  • Dark Mode — Designed for comfortable use on job sites and in the field
  • US & Metric — Toggle between unit systems instantly
  WHY ELECTRONIC ENGINEER?
Built by engineers, for engineers. We obsessed over accuracy, speed, and
  completeness so you can focus on what matters — getting the job done right.
  One purchase, no subscriptions, no recurring fees.


## Version history (last 4 releases)

### 2.01 — 2026-03-18

minor bug fix

### 2.0 — 2026-03-18

Totally rewritten with hundreds of new formulas and reference tables

### 1.0.1 — 2013-08-01

Minor Bug Fixes

### 1.0 — 2013-07-24

No release notes.

## More apps by Historycentral.com Inc

- [Finance Formulator](https://appshunter.io/ios/app/finance-formulator/id294194640)
- [Personal Formulator](https://appshunter.io/ios/app/personal-formulator/id296173495)
- [Electrical Formulator](https://appshunter.io/ios/app/electrical-formulator/id299749412)
- [Plumbing Formulator](https://appshunter.io/ios/app/plumbing-formulator/id303497783)
- [Carpentry Formulator](https://appshunter.io/ios/app/carpentry-formulator/id305583131)
- [Builder's Formulator](https://appshunter.io/ios/app/builders-formulator/id306247596)

All apps by Historycentral.com Inc: https://appshunter.io/developer/1744330560

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-15.*