# WireSizer - DC Voltage Drop — Wire Gauge & Size Calculator > DC wire size calculator for voltage drop and ampacity. (iPhone/iPad app by Juggernaut Technology, Inc..) - Source: https://appshunter.io/ios/app/wiresizer-dc-voltage-drop/id494748550 (this page in markdown: same URL + `.md`) - Developer: [Juggernaut Technology, Inc.](https://appshunter.io/developer/494748553) - Category: Utilities, Reference - Price: $4.99 - Rating: 4.50/5 from 225 App Store ratings · 37 written reviews indexed - Age rating: 4+ - Requires: iOS 26.0 · 2 MB - Languages: American English - Released: 2012-01-18 - Data updated: 2026-08-28 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/wiresizer-dc-voltage-drop/id494748550/reviews.md ## What is WireSizer? WireSizer is the fast, accurate, and easy-to-use DC wire size calculator for choosing the correct wire gauge every time. Simply select your DC voltage, current, and total circuit length with flips of your finger. No keyboard required. WireSizer instantly calculates the correct wire gauge for the Voltage Drop percentage you need. WireSizer is ideal for: • Boats and marine electrical systems • RVs, trucks, and cars • Radios and electronics • Solar power and battery-based DC systems • Any low-voltage DC system up to 60 VDC Suitable for both professionals and DIY users. WireSizer automatically calculates the minimum wire size required for your circuit (assuming copper wire), taking Voltage Drop into account for installation and temperature conditions. Results are checked against current-carrying capacity (ampacity) limits to prevent using unsafe undersized wire. Supported values: • Voltage up to 60 VDC • Current up to 500 amps • Total circuit length up to 600 feet or 200 meters • Voltage Drop from 1 to 20 percent • AWG wire from 4/0 through 18 gauge • SAE wire from 4/0 through 18 gauge • Metric wire from 150 mm² through 0.75 mm² WireSizer allows you to fine-tune calculations based on real-world installation conditions: • Engine compartment or other high-temperature environments • Sheathed, bundled, or conduit-run wire • Wire insulation ratings from 60°C to 200°C WireSizer also includes a Materials List so you can record and review all of your wire selections in one place. WireSizer calculates DC wire sizes in accordance with ABYC E-11 (July 2025). For typical low-voltage DC circuits, results generally correspond with ISO 13297:2020. Results are a design aid; final wire selection and installation compliance remain the installer's responsibility. Number and decimal formatting will follow your device's regional and language settings. WireSizer works without an internet connection and contains no ads. Not for use with AC circuits. WireSizer will cost you less than the wire scraps you probably throw away at the end of the day. ## Key features - 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 ## Recent user reviews (10 of 37) All indexed reviews: https://appshunter.io/ios/app/wiresizer-dc-voltage-drop/id494748550/reviews.md ### 5/5 — Simple, ABYC-based and by far the best *2026-05-09* 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. ### 5/5 — Easy to use, works great. *2024-05-15* This app is one of my essential tools while doing any electrical project, it’s great. ### 1/5 — Super bad investment *2023-11-12* There is no real calculation… all has no utility, totally useless. **Developer response:** WireSizer calculates the minimum wire size needed to meet voltage drop requirements based on user inputs (voltage, circuit length, operating environment, wire insulation rating, and current/watts). In addition, it also verifies the "Ampacity" of the wire to make sure it is safe for your circuit. Details on calculations made and formulas used can be found in the WireSizer "User Guide" within the app or online from WireSizer.com. Users can always request a refund from Apple if an app does not meet their expectations. ### 5/5 — FAST calculator + handy material list. *2023-06-03* 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+++ ### 5/5 — Terrific app! Simple, as it ought to be *2022-06-09, version 3.22* I use it daily in my boat electrical work. I would like an AC calculation for higher voltages, in future versions of the app. ### 5/5 — Terrific app! Simple, as it ought to be *2022-06-09, version 3.22* I use it daily in my boat electrical work. I would like an AC calculation for higher voltages, in future versions of the app. ### 1/5 — Only does DC current. *2022-04-15* Lame **Developer response:** Yes, it is DC only. As clearly indicated by its subtitle in the App Store "DC Voltage Drop Calculator", and as clearly stated in its App Store product description multiple times, including in ALL CAPS - "NOT FOR USE WITH AC CIRCUITS!". ### 5/5 — Easy to use and accurate *2022-02-20* I am a Marine Engineer and I use this app at my desk and in the field to run “how to” calculations to determine the wire size required for a particular voltage, load current and circuit run. The spinner wheels make it very easy to enter the data and the drill down that is available when the results tapped is an excellent bonus. My favorite wire sizing app. ### 4/5 — Very helpful, limited to 50VDC *2021-05-28* I use this app all the time! Would use it even more if it could support higher voltages. I’d like to see at least 150vdc, and 240vac. Thanks for the useful tool! **Developer response:** The latest version now allows voltage up to 60 volts DC.  Calculating wire sizes for higher voltages requires taking into account some additional factors to do properly (which many voltage drop calculators neglect). We are planning on investigating the feasibility of this in the future. Thanks for the review! ### 5/5 — Wire sizer app *2020-04-25* This is a fantastic app that is really accurate. The app has made my life so much easier when re-wiring my boat. 👍 ## Frequently asked questions about WireSizer ### 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. ## Version history (last 5 releases) ### 3.33 — 2026-08-21 + Performance, User Interface, and Stability improvements. If you have any questions, problems, or comments, please contact us at support@WireSizer.com! ### 3.32 — 2026-05-31 + 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! ### 3.31 — 2026-05-29 + Number formatting now follows your device's regional 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! ### 3.30 — 2026-01-03 + Performance, User Interface, and Stability improvements. If you have any questions, problems, or comments, please contact us at support@WireSizer.com! ### 3.29 — 2025-10-29 + Performance, User Interface, and Stability improvements. If you have any questions, problems, or comments, please contact us at support@WireSizer.com! ## Apps similar to WireSizer | App | Rating | Price | Category | | --- | --- | --- | --- | | [Electrical Calc Elite](https://appshunter.io/ios/app/electrical-calc-elite/id510284903) | 4.8 (125) | $19.99 | Utilities | | [Voltage Drop Calculator.](https://appshunter.io/ios/app/voltage-drop-calculator/id1203737064) | 4.6 (412) | Free | Utilities | | [Wire Gauge & Size Calculator](https://appshunter.io/ios/app/wire-gauge-and-size-calculator/id6743387075) | 4.9 (13) | Free | Utilities | | [AWG Calculator: Wire Size](https://appshunter.io/ios/app/awg-calculator-wire-size/id1607173204) | 4.6 (67) | Free | Utilities | | [Ohm's Law: Circuit Calculator](https://appshunter.io/ios/app/ohms-law-circuit-calculator/id6739168645) | 5.0 (1) | Free | Utilities | | [E-Calc USA](https://appshunter.io/ios/app/e-calc-usa/id6502258186) | 5.0 (1) | $14.99 | Utilities | ## More apps by Juggernaut Technology, Inc. - [HIN Search - Boat HIN Decoder](https://appshunter.io/ios/app/hin-search-boat-hin-decoder/id529669534) - [Rivercast: River Levels USA](https://appshunter.io/ios/app/rivercast-river-levels-usa/id545375951) - [NOAA Buoy Reports & Ship Data](https://appshunter.io/ios/app/noaa-buoy-reports-and-ship-data/id1038264455) All apps by Juggernaut Technology, Inc.: https://appshunter.io/developer/494748553 ## Related topics [wire size calc](https://appshunter.io/ios/topics/wire-size-calc) · [southwire voltage drop](https://appshunter.io/ios/topics/southwire-voltage-drop) --- *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 2026-08-28.*