DC Wire Sizer

DC Wire Sizer

Easy Wire Sizing Calculator!

21 ratings
14 reviews
#188 in paid Utilities
🔧 Utilities
🔍 Reference
$2.99

Details

  • Released
  • Updated
  • June 4, 2013
  • March 11, 2020

Features

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About

Calculate appropriate DC wire sizes for electrical projects, preventing equipment damage and fires. Save, edit, and export wire run details for electrical plans and material purchases. Features a wizard for easy sizing for all users.

Calculates wire size, voltage drop, and ampacity
Supports custom DC voltages up to 500 amps
Save, edit, and export wire run details
Sizer Wizard for easy calculations
Select marine standards (ABYC or ISO)
Choose from various wire types and insulation ratings
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What's New in DC Wire Sizer

1.2

March 11, 2020

Thanks to you, DC Wire Sizer is still the highest rated (5-star) DC wire sizing app! Read below for changes in version 1.2, tips to help you get the most out of DC Wire Sizer, and what enhancements are in the pipeline. VERSION CHANGES IN 1.2: - Dark Mode, looks so awesome that we had to update light mode too. - Doubled Wire Length to 600 feet Round Trip (or 300 feet One-Way). - Minor Bug Fixes. - Updates for iOS 13. DC WIRE SIZER TIP #1: DC Wire Sizer has 3 methods of wire length entry (One-Way, Total Run and Positive/Negative). Choose the wire length entry method that works fastest for you and/or your project by: 1) Double Tap the wire length field while entering a length. 2) Tap the “Menu” button (top left corner) to “Toggle Measurement Method”. 3) Or if f you have a preferred method, change the default method in “Settings” by Tapping the “Menu” button, then Tapping "Settings” and selecting the “Sizer Pro: How Length is Entered” method that matches your preference. Note: for clarity, the Sizer Wizard only uses the “Pos (+) Neg (-)” wire length measurement method. DC WIRE SIZER TIP #2: DC Wire Sizer was developed to be fast and choosing the method of wire length entry (double tape the wire length field) can expedites the entry, we recommend: When using duplex cables, where the “Pos (+) Neg (-)” wire lengths are equal, the “One-way” method is the fastest length entry. Note, the length is auto-doubled in the calculation for positive plus negative wire lengths. 2) When the negative wire is a different length or contact grounded (CG) to the chassis, negative bus bar, or engine (AKA starter or alternator), use the “Pos (+) Neg (-)” wire length measurement method. Note: ensure the bus bar or engine has adequate wire size for the total of all concurrent amp loads. 3) If you are used to using “Total length” (AKA positive plus negative wire lengths), use the “Round Trip” method. WHAT ENHANCEMENTS ARE IN THE PIPELINE: DC Wire Sizer 1.3, with the Australian/New Zealand (AS/NZS) marine standard, starts beta testing after this year’s AU/NZ standard release. DC Wire Sizer 2.0, is in development and will have the following new features and enhancements: 1) Increasing amps from 500 to 1,000, 2) Multi-conductor option (updated from our commercial beta), 3) Fuse/circuit breaker sizing (updated from our commercial beta), 4) “Non-Marine” standard options for solar, RVs, cars, trucks, and other DC usages. Since 2013, we have implemented 100% of our customer enhancement requests. In 2.0 and 3.0, we are adding several significant features requested by professionals and industry experts. If you have any feature suggestions or questions, we'd love to hear them. If you need assistance, we're happy to help. Please email me at cases@dirtydogsoftware.fogbugz.com. When you have time, learn more about DC Wire Sizer through the following: - Videos on the Support page at www.dirtydogsoftware.com/dc-wire-sizer-support - FAQ page at www.dirtydogsoftware.com/dc-wire-sizer-faq Also check out the boating tips and recommendations on the Boater’s page at www.dirtydogsoftware.com/boating-home-page. Thank you again for your continued support and feedback!

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📊 188

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The app has maintained its position at 188 recently.

Last updated on July 24, 2026.

User reviews

Great Resource

Does exactly what I needed. Worth the money.

Very helpful tool

I love this app! It is an indispensable tool in a boater’s toolbox. It makes correctly figuring out the wiring in a boat so simple. It’s functionality is well thought out. The authors keep it updated to the latest standards and technology. Wiring a boat is a serious affair and if done incorrectly can spell danger for a boat and the life aboard. I’m glad the authors of this app have put so much work and thought into this wonderful tool. I especially love the help section of the app which is full of great information, too, as is their web site. This app is simple to use and the wizard functionality walks you through every step in wiring for even a true novice. Thank you for producing such a great tool and for all the knowledge I have acquired from it. Great job!!!
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The only way

A good pocket app. to have when working on your boat.

Cable Wire

Wire Air Wire Cable

One of a kind. Wish I’d found years ago

I’m going through my van checking all fuses and wires. This app is incredibly helpful and I can export the results!

FAQ

What is DC Wire Sizer?

DC Wire Sizer is a utility app designed to calculate the correct DC wire sizes for electrical projects. It helps prevent equipment damage and potential fires by ensuring proper wire selection based on voltage drop and ampacity.

How does DC Wire Sizer calculate wire size?

It calculates wire size, voltage drop (VD), and ampacity based on user-inputted DC voltage, amperage, and wire length. It also allows for granular 'what if' analysis of ampacity and VD.

Can I save my wire calculations with DC Wire Sizer?

Yes, you can save individual wire runs with details like project name, wire type, color, and material source. You can also edit these saved runs later.

Does DC Wire Sizer help with purchasing materials?

Yes, the app can sum active wire run lengths by size, type, and color, which simplifies material purchasing, especially when buying wire by the reel.

What marine standards does DC Wire Sizer support?

DC Wire Sizer supports both ABYC and ISO marine standards for wire sizing calculations.

What is the price of DC Wire Sizer?

DC Wire Sizer is a paid application priced at $2.99.

What devices is DC Wire Sizer available on?

DC Wire Sizer is available for iPhone, iPad, and iPod devices.

How often is DC Wire Sizer updated?

The app was last updated on March 11, 2020, with version 1.2. It was originally released on June 4, 2013.