Best Voltage Amperage Calculator Apps

195+ iOS apps curated and reviewed

4.5 avg rating
18 free apps
Updated June 2026

If you already know Southwire® Voltage Drop Calc, this is the deeper bench. 195+ voltage amperage calculator apps for iPhone, all reviewed and ranked by user rating, recency, and download trend as of June 2026.

Top Picks for Voltage Amperage Calculator

Southwire® Voltage Drop Calc#1

Southwire® Voltage Drop Calc by Southwire Company

Southwire Calculator
Editor's Choice
🔧 Utilities
4.6😐(1.4K ratings)
Free
Southwire® Voltage Drop Calc screenshot 1
Southwire® Voltage Drop Calc screenshot 2
Southwire® Voltage Drop Calc screenshot 3
Southwire® Voltage Drop Calc screenshot 4
Southwire® Voltage Drop Calc screenshot 5
Southwire® Voltage Drop Calc screenshot 6

Calculate the right wire size for your electrical circuit with this voltage drop calculator. Ensure proper conductivity while meeting specific voltage drop limits and NEC ampacity standards. Perfect for AWG and KCMIL sizes in various applications.

What We Love

  • 🚀 Quick and useful
  • 🚀 Great Quick Reference
  • 👍 A must have app for electricians
  • 👍 Love These

Room to Improve

  • 🐛 Motor starting Voltage drop
  • 🐛 Useless!
  • 🐛 Won't work
Scientific Calculator Plus 991#2

Scientific Calculator Plus 991 by Tran Duy

Designed for math calculator
Strong Contender
📚 Education
4.7😊(12K ratings)
FreeAdsIn-App Purchases
Scientific Calculator Plus 991 screenshot 1
Scientific Calculator Plus 991 screenshot 2
Scientific Calculator Plus 991 screenshot 3
Scientific Calculator Plus 991 screenshot 4
Scientific Calculator Plus 991 screenshot 5
Scientific Calculator Plus 991 screenshot 6

A versatile scientific calculator app designed for math enthusiasts, offering features like natural display for textbook-like equations, symbolic and numeric modes, complex number calculations, calculus functions, statistical analysis, and unit conversion. With a premium upgrade option for additional advanced features and customization. Access the power of NCalc FX now!

What We Love

  • 👍 Intuitive and easy to use
  • 🚀 Powerful and feature-rich
  • 💡 Customizable interface and settings
  • 🔍 Extensive library of formulas and equations

Room to Improve

  • 🐛 Occasional bugs and input issues
  • 🔀 Confusing layout and button placement
  • 💰 Some advanced features locked behind paywall
Ohms Law Calc.#3

Ohms Law Calc. by V PUGAZHENTHI

Wire Size & Voltage Drop
Worth Considering
🔧 Utilities
4.7😊(1.3K ratings)
FreeAdsIn-App Purchases
Ohms Law Calc. screenshot 1
Ohms Law Calc. screenshot 2
Ohms Law Calc. screenshot 3
Ohms Law Calc. screenshot 4
Ohms Law Calc. screenshot 5
Ohms Law Calc. screenshot 6

Ohms Law Calc. is a comprehensive app featuring 62 electrical calculators and formulas for various calculations such as voltage, current, resistance, and power. Explore a wide range of tools including voltage drop, power factor, transformer calculator, and more!

What We Love

  • 🚀 Great value
  • 🚀 Works perfectly
  • 🚀 Fantastic app
  • 👍 Best thing since sliced bread

Room to Improve

  • 👎 Have to pay again for an app already purchased
  • 👎 Not easy to use
  • 🐛 Paid but not unlocked, no response from developer

More Voltage Amperage Calculator apps to explore

4
AWG Calculator: Wire Size
AWG Calculator: Wire Size
AWG Calculator: Wire Size
Electrician Wire Tool
Free

This electrical calculation tool simplifies wire size and other calculations following NEC standards, making it ideal for professionals and DIYers. Download now and try it for free for a month to streamline your electrical design and installation work.

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5
SIMpull 600V Calculator
SIMpull 600V Calculator
SIMpull 600V Calculator
Southwire Calculator
Free

This application provides multiple calculators for electrical wire pull characteristics, generating NEC-compliant answers for voltage drop, wire sizing, and more. It helps users perform calculations and easily share results.

🔍 Reference
(57)
6
Electrical Calculator lite
Electrical Calculator lite
Electrical Calculator lite
60 Calculators & 16 Converters
Free
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7
Electrical Calculator
Electrical Calculator
Electrical Calculator
Electrical Tools & Formulas
$3.99

This all-in-one electrical calculation app provides over 65 tools and formulas for electrical and electronics engineers, students, and professionals, covering a wide range of calculations from voltage and current to power and energy. With flexible unit selection and a simple interface, it enables fast and accurate calculations, supporting both USCS and SI units, and is a valuable resource for anyone working with electrical systems.

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8
Ohms Law
Ohms Law
Ohms Law
Ohms Law Calculator
Free

This electrical calculator helps you determine voltage, current, resistance, and power by simply inputting any two values. Download it now and easily compute the other two values using a straightforward and efficient calculation process.

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9
Basic Electronic Calculator
Basic Electronic Calculator
Basic Electronic Calculator
by Gergely Nagy
Free

This electric calculator computes voltage, current, resistance, and power when given any two values, automatically determining the missing ones. Try it out to easily solve electrical calculations with the option to switch between normal and scientific notation.

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10
PCalc Lite
PCalc Lite
PCalc Lite
The Best Calculator
Free

PCalc Lite is the ideal calculator app for scientists, engineers, students, and programmers offering RPN mode, multi-line display, unit conversions, constants, and more. Try it for free on your iPad and upgrade for additional features or themes. Also available on Apple Watch for on-the-go calculations.

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(213)
11
Fault Current Calculator
Fault Current Calculator
Fault Current Calculator
by Cooper Bussmann, LLC
Free

This innovative tool helps contractors, engineers, electricians, and inspectors calculate available fault current on single and three-phase systems, size fuses and conductors, and create labels for service equipment. Try it out to easily determine fault current and ensure compliance with electrical safety standards.

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12
Watts Amps Volts  Calculator
Watts Amps Volts  Calculator
Watts Amps Volts Calculator
Electrical power calculator
Free

This electrical power calculator allows users to calculate and convert between various electrical units, including Watts, Amps, Volts, kW, and Power Factor, for single and three-phase electrical formulas. Simply enter the required values and press calculate to get the desired result.

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(46)
13
Feet and Inches Calculator
Feet and Inches Calculator
Feet and Inches Calculator
Perfect Construction Calc!
Free

Calculate measurements with ease using this construction calculator designed for quick and accurate results. Perfect for all your project needs – download now and simplify your work!

🔧 Utilities
(384)
14
Voltage Drop Calculator.
Voltage Drop Calculator.
Voltage Drop Calculator.
Wire Size, NEC & IEC Tools
Free
🔧 Utilities
(411)
15
ElectriCalc Pro
ElectriCalc Pro
ElectriCalc Pro
Electrician NEC Calculator
Free
$29.99 | 100% OFF

This electrical code calculator app helps electrical contractors, designers, and specialists solve complex calculations in seconds, ensuring conformance with the latest National Electrical Code (NEC). Try it for free before buying, and discover a comprehensive electrical reference tool that saves time, trouble, and money.

🔧 Utilities
(256)
16
Ugly's Electrical References
Ugly's Electrical References
Ugly's Electrical References
by Informed Publishing
$12.99

This app is a comprehensive electrical reference guide that has been updated to align with the 2020 National Electrical Code. It offers a range of features such as calculators, interactive tools, and in-depth information for electricians, making it a valuable on-the-job resource.

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(1)
17
Prysmian Group Voltage Drop
Prysmian Group Voltage Drop
Prysmian Group Voltage Drop
by Prysmian S.p.A.
Free

This tool helps electrical professionals quickly calculate maximum circuit distance and minimum conductor size for a required voltage drop, providing essential details like actual voltage loss and maximum amps. Try it out to easily determine conductor sizes and circuit distances based on NEC codes and conductor types.

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(6)
18
Electrical Calculator Plus
Electrical Calculator Plus
Electrical Calculator Plus
by Inch Calculator
Free

This application provides a comprehensive collection of electrical calculators and converters to compute various electrical properties, including Ohm's Law, current, power, voltage, and resistance. Download the app to access 26 tools that can help you with electrical calculations and conversions.

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(15)
19
Electronics Circuit Calculator
Electronics Circuit Calculator
Electronics Circuit Calculator
Arduino Experiments Guide
Free
$2.99 | 100% OFF

This app provides a comprehensive set of tools for electronics circuit calculations, conversions, and experiments, making it a handy resource for engineers, students, and hobbyists. With over 55 calculations and conversions, it simplifies circuit design and analysis, allowing users to instantly calculate variable values and track their work.

📚 Education
(62)
20
Electrical Calculations
Electrical Calculations
Electrical Calculations
by Egal Net di Ettore Gallina
Free
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