WireSizer - DC Voltage Drop

WireSizer - DC Voltage Drop

DC Wire Size Calculator

224 ratings
37 reviews
$4.99

Details

  • Released
  • Updated
  • January 18, 2012
  • May 31, 2026

Features

WireSizer - DC Voltage Drop screenshot #1 for iPhone
WireSizer - DC Voltage Drop screenshot #2 for iPhone
WireSizer - DC Voltage Drop screenshot #3 for iPhone
WireSizer - DC Voltage Drop screenshot #4 for iPhone
WireSizer - DC Voltage Drop screenshot #5 for iPhone
WireSizer - DC Voltage Drop screenshot #6 for iPhone
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About

This app quickly calculates the correct DC wire gauge needed for any circuit. Simply input voltage, current, and length to determine the optimal wire size, considering voltage drop and ampacity limits. It's suitable for various DC systems up to 60 VDC.

Instant DC wire size calculation
Voltage drop percentage selection
Ampacity limit checks
Supports various wire types and gauges
Adjustable for installation conditions
Materials list for selections
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What's New in WireSizer

3.32

May 31, 2026

+ Number and decimal formatting will follow your device's regional and language settings. + Improved iPad layout when resizing. + Performance, User Interface, and Stability improvements. If you have any questions, problems, or comments, please contact us at support@WireSizer.com!

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User reviews

Simple, ABYC-based and by far the best

It’s so nice having a professional app that does its job and does not get bogged down with bells and whistles: The app only has one page! I have used WireSizer daily for years because it’s quick and gives the critical voltage drop information needed to choose correct wire size, while being entirely interactive: Spin gauge, amperage or length wheels and the results are instantly updated, making decisions easy and quick.
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Easy to use, works great.

This app is one of my essential tools while doing any electrical project, it’s great.

Super bad investment

There is no real calculation… all has no utility, totally useless.

FAST calculator + handy material list.

This is an absolute must have! As a home DIYer I wish I had this years ago instead of referring to a chart as a guide. In the process of Installing a vehicle 12v and solar system and this has become extremely handy and sped up the building process significantly. The ‘+’ for material list is the cherry on top. Highly recommend A+++
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Terrific app! Simple, as it ought to be

I use it daily in my boat electrical work. I would like an AC calculation for higher voltages, in future versions of the app.

Developer apps

FAQ

What does WireSizer do?

WireSizer is a DC wire size calculator that helps you determine the correct wire gauge for your electrical circuits. It instantly calculates the minimum wire size required by considering voltage, current, circuit length, and desired voltage drop percentage.

What are the key features of WireSizer?

Key features include instant calculation of wire gauge, selection of voltage drop percentage, automatic checks against ampacity limits, support for various wire types and gauges (AWG, SAE, Metric), and the ability to adjust calculations for installation conditions like temperature and bundling. It also includes a materials list.

How much does WireSizer cost?

The application is a paid app. The description suggests its cost is less than the expense of wasted wire scraps, implying it offers good value for its price.

What systems is WireSizer compatible with?

WireSizer is designed for low-voltage DC systems up to 60 VDC. It is ideal for marine electrical systems, RVs, trucks, cars, radios, electronics, solar power, and other battery-based DC systems. It is not for use with AC circuits.

Can WireSizer be used offline?

Yes, WireSizer works without an internet connection. This allows you to use it in remote locations or situations where internet access may be unreliable.