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  • #: 13822
  • Price: $6.99 In Apple Store
  • Category: Utilities
  • Updated: 2009-11-25
  • Current Version: 1.4
  • 1.4
  • Size: 0.50 MB
  • Language: English
  • Seller: Serafini Studios
  • Requirements: Compatible with iPhone, iPod touch, and iPad. Requires iOS 2.2.1 or later
  • © 2009 Serafini Studios
  •  Add to Favorite apps



E-Formulas 1.4 introduces our most requested feature calculating resistance and capacitance in series and parallel.

Easily solve any of the variables in 22 of the most useful formulas in electronics including the first Voltage Drop calculator in the App Store. Over 70+ formula variations in total. Standard international units are fully supported and results are automatically computed using unit picker control.


• Includes custom numeric keypad for rapid and accurate entry of numbers

• Select specific unit multipliers for each variable

• Graphic representation of each formula for easy identification

• Each formula includes a descriptive overview and link to Wikipedia for more in-depth information

• Shake to clear all values


• Ohm's Law

• Power

• Power Dissipation (Current)

• Power Dissipation (Voltage)

• Joule's Law

• Voltage Drop

• Capacitive Reactance

• Inductive Reactance

• Impedance

• Resonance

• RC Time Constant

• RL Time Constant

• Power Gain

• Voltage Gain

• Frequency Wavelength

• AC Peak Voltage

• Parallel Resistance

• Series Resistance

• Parallel Capacitance

• Series Capacitance

• Parallel Inductance

• Series Inductance


• Ohms

• Amps

• Volts

• Watts

• Farads

• Henrys

• Hertz

• Seconds

• Decibels

• Meters

• Joules


• cmil (Circular Mils)

• mm2 (Square Millimeters)


Future versions including additional formulas will be free.


To request the addition of a new formula, make a suggestion or report a bug please send an email to support@formulasensei.com

What's New in Version 1.4

Added formulas for parallel and series resistance, capacitance, and inductance.
Added metric units for Voltage Drop length.
Added imperial units for Wavelength formula.
Adjusted Voltage Drop K constant value.
Changed how unit picker works to include a Select button to increase accuracy

iPhone Screenshots

E-Formulas iPhone Screenshot 1
E-Formulas iPhone Screenshot 2
E-Formulas iPhone Screenshot 3
E-Formulas iPhone Screenshot 4
E-Formulas iPhone Screenshot 5

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Rated 5/5 based on 2 customer reviews.


5/5 stars

Great app

It does all it says and that's all I expected. Some idiots in they're reviews always want more and down grade their rating because of it. Like Ugly. How about the kitchen sink too. And let me guess, you want all those extras at no extra cost. Poor app. It doesn't say anything about using it for power. For the dummy who wants power formulas. They're there stupid. Look under "POWER" not ohms. For the gal who couldn't get it to work. I bet your just the best in the field.

5/5 stars

Electronic Formulas

Wow! This app is a huge help. I'm just starting year #2 in an Electronics Course, this app has really helped me get my head back in the game after some summer fun. Big time saver. I especially like the way you can change the formulas and units around. The wiki links are awsome too. Need to run a spell check though...........


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The information may be outdated (2017-03-06 17:06:04). For actual information go to iTunes

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