# DC Wire Sizer — Easy Wire Sizing Calculator! > DC electrical wire sizing calculator with voltage drop and ampacity calculations. (iPhone/iPad app by Dirty Dog Software, LLC.) - Source: https://appshunter.io/ios/app/dc-wire-sizer/id629190351 (this page in markdown: same URL + `.md`) - Developer: [Dirty Dog Software, LLC](https://appshunter.io/developer/629190354) - Category: Utilities, Reference - Price: $2.99 - Rating: 5.00/5 from 23 App Store ratings · 14 written reviews indexed - Age rating: 4+ - Requires: iOS 9.0 · 21 MB - Languages: American English - Released: 2013-06-04 - Data updated: 2026-08-24 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/dc-wire-sizer/id629190351/reviews.md ## What is DC Wire Sizer? Adding accessories (bilge pumps, electronics, solar, etc.) or upgrading batteries (AGM, Li, etc.) this year?  The #1 Cause of Boat and RV fires is DC wiring!  Undersized wires can damage equipment or cause fires.  The top-rated DC Wire Sizer calculates wire size for any DC voltage (ideal for solar in series). Plus lets you SAVE, EDIT, SUM, EMAIL and EXPORT the wire runs and material for your electrical plan, wire purchases, work orders, and records. And the Sizer Wizard option makes wire sizing easy for EVERYONE! Fast and safe wire sizing calculator for your next DC wiring project (battery, charger, inverter, trolling motor, stereo, and more). Designed with and for Marine Electronics Installers, Repair Services, Boat Builders, Surveyors, Do-It-Yourselfers, and Boat Owners. ONLY DC WIRE SIZER OFFERS these FEATURES: - Select any DC voltage and up to 500 amps - Results display wire size, VOLTAGE DROP (VD), and AMPACITY! - More granular “What if” analysis of ampacity & VD based on wire sizes & length - Choose from three methods of entering wire lengths for fast entry including separate positive/negative wire lengths (when different or negative is contact grounded, like a starter) - SAVE Wire Runs with the option to select or enter Wire Run & Project Name, wire type, wire color, status, and material source (Inventory or Buy) - EDIT Wire Runs including wire length, amps/watts, max voltage drop, insulations, inside/outside engine room, bundle, and the fields above. - SUMs active wire run lengths by size, type, and color to make purchasing easier and less expensive when by the reel (25’, 50’, 100’, etc.) - Select from a wire type list (e.g., primary, battery, safety, flat, duplex, triplex, mast, twisted, bilge, trailer, and solar cable) - Select marine standards (ABYC or ISO) - Change Unit of Measurement (Feet or Meters) in existing Wire Runs - Easy to use Sizer Wizard - Email and Export of Wire Runs and Raw Material MORE FEATURES: - Set default Wire Gauge (AWG, SAE, or MM2) - Set default Unit of Measure (feet or meters) - Select or enter Maximum Voltage Drop % - Select Bundle Size (1, 2-3, 4-6, 7-24, and 25+) - Select Insulation rating (60°, 75°, 80°, 90°, 105°, 125°, and 200°C) - Tap Inside/Outside Engine Room - Spin Amp/Watts and Wire Length for fast entry - Built-in Help and Technical Reference includes installation tips, connector types, color codes, tables (Voltage Drop, Ampacity, & Bundle), formulas (Power Triangle, Ohm's Law, etc.), recommended tools/books, and more. HERE’S WHAT REVIEWERS ARE SAYING: "The DC Wire Sizer is the most complete and comprehensive marine DC wire-sizing tool available. Developed for both marine professionals (the Wire Sizer Pro) and the occasional tinkerer (the Wire Sizer Wizard), the app determines the proper wire size, along with the voltage drop and ampacity by using the ABYC E-11 or ISO 10133 formulas and tables.” -  OnboardOnline (2013) "Stay organized by adding a wire description to the wire run and assign it to a project name (ie boat name, owner or work order). Mark the wire run as "Complete" or “Cancelled”, re-order wire runs within a project or move them between projects. Tired of adding wire runs in order to figure out what to purchase and how much? DC Wire Sizer sums the active wire runs for you by wire size (e.g. 8 AWG) and type (e.g. Safety Duplex, Battery Cable, and Primary Wire).” - marinabusiness (AU 2013) "If you're doing a lot of wiring on your boat, the app allows you to save the calculations with project names and wire type.  The app then can sum the length of the wire runs by wire type and size which can be used as a shopping list for your projects.  No other app offers these unique features and that's what makes it a winner.”  - i-marineapps (2013) "This is the best wire sizer program I have seen to date.  I can size and make a list at the same time also there is a better selection of amps and volts.” - Keith Herridge, Special Projects, Lyman-Morse Boatbuilding ## Key features - 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 ## Recent user reviews (10 of 14) All indexed reviews: https://appshunter.io/ios/app/dc-wire-sizer/id629190351/reviews.md ### 5/5 — Great Resource *2024-10-08* Does exactly what I needed. Worth the money. ### 5/5 — Very helpful tool *2024-03-21* 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!!! ### 5/5 — The only way *2023-11-17* A good pocket app. to have when working on your boat. ### 5/5 — Cable Wire *2022-12-14* Wire Air Wire Cable ### 5/5 — One of a kind. Wish I’d found years ago *2022-10-05* I’m going through my van checking all fuses and wires. This app is incredibly helpful and I can export the results! ### 5/5 — One of the best wire size tools *2022-04-14* Very flexible for non traditional DC systems like 36, 48, 96v setups. Invaluable tool for peace of mind. ### 5/5 — Awesome! *2020-04-06* Well worth it, saves a ton of time. ### 5/5 — Very helpful tool *2020-02-27, version 1.1.1* 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 — so is their web site. If you own a boat you definitely should own this app even if you don’t know a whole lot about electricity. 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!!! ### 5/5 — IOS 11 *2017-09-12* The app is very useful! Will it be upgraded to work with IOS 11? ### 5/5 — Works very well!! *2013-07-24* Looking forward to their other apps.... This is a very well written app. ## Frequently asked questions about DC Wire Sizer ### 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. ## Version history (last 4 releases) ### 1.2 — 2020-03-11 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! ### 1.1.1 — 2018-07-24 - Resolved issue accessing Settings on iPad (only iPads using version 1.1 were affected). - Added the ability to change the units of measure (aka feet or meters) on existing wire runs. - Added Solar PV Cable to the list of wire types. ### 1.1 — 2017-09-22 DC Wire Sizer’s initial release set the bar for features that has still not been matched and has been extremely bug free and stable. Aside from iOS 11 compatibility and formatting changes, this maintenance release only has only a few minor changes: 1) Compatibility updates for iOS 11. 2) Enable wire bundles for all voltages, not just > 50v, since the current USA ABYC E-11 has no voltage restriction on bundle ampacity degradation. DC Wire Sizer has always had wire bundles but the earlier ABYC E-11 did not require the calculation when under 50volts. The new maintenance release of DC Wire Sizer has the bundles visible at all time. 2) The previous version of DC Wire Sizer only showed email export options when email was available (aka email had been set up on the device). This release shows the export options at all times. 3) Change to always display the clear button (“X”) in the Project name and Wire name text fields when editing a wire run. 4) Screen format changes (aka added auto layout support). 5) Made minor wording changes. 6) Added some higher resolution images for the help text. 7) Minor bug fixes. We are currently working on two new boating apps plus a new general release of DC Wire Sizer that will have significant upgrades and enhancements (aka raising the bar again). Since the general release is still in development, please feel free to send us any recommendations for changes and enhancements. Thank you, Dirty Dog Software. ### 1.0 — 2013-06-03 No release notes. ## Apps similar to DC Wire Sizer | App | Rating | Price | Category | | --- | --- | --- | --- | | [WireSizer - DC Voltage Drop](https://appshunter.io/ios/app/wiresizer-dc-voltage-drop/id494748550) | 4.5 (225) | $4.99 | Utilities | | [ARCO Zeus](https://appshunter.io/ios/app/arco-zeus/id6446371700) | 4.3 (6) | Free | Utilities | | [Wakespeed](https://appshunter.io/ios/app/wakespeed/id1526101154) | 2.2 (5) | Free | Utilities | | [AirmarCAST™](https://appshunter.io/ios/app/airmarcast/id1492428585) | 2.6 (5) | Free | Utilities | | [AWG Calculator: Wire Size](https://appshunter.io/ios/app/awg-calculator-wire-size/id1607173204) | 4.6 (67) | Free | Utilities | | [Voltage Drop Calculator.](https://appshunter.io/ios/app/voltage-drop-calculator/id1203737064) | 4.6 (412) | Free | Utilities | ## Related topics [wire sizing](https://appshunter.io/ios/topics/wire-sizing) · [wire size calc](https://appshunter.io/ios/topics/wire-size-calc) · [lead wire ampacity](https://appshunter.io/ios/topics/lead-wire-ampacity) --- *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 2026-08-24.*