WireGauge: DC Wire Size
Voltage drop & AWG
Only for iPhone
$4.99 · Designed for iPhone. Not verified for macOS.
iPhone
Size copper DC wiring right: check voltage drop and ABYC ampacity together, see which is the limit, and work backwards for max run or load. Offline, buy once.
WireGauge finds the right copper wire size for low-voltage DC circuits on boats, RVs, campers, vans, solar setups and vehicles - the fast, no-guesswork way.
Most "wire size" charts only check one thing. WireGauge checks BOTH limits that actually matter and tells you which one decides your gauge:
SIZE IT IN SECONDS
- Enter current (amps), one-way run length, and system voltage (12 / 24 / 48 V).
- Get the smallest safe AWG, the real voltage drop in volts and percent, and the wire's ampacity.
- See at a glance whether voltage drop or ampacity is the limiting factor.
TWO CHECKS, ONE ANSWER
- Voltage drop uses the standard ABYC round-trip model (2 x length x resistance x current).
- Ampacity follows ABYC E-11 Table 6A, with insulation temperature rating (60/75/90/105C) and bundle derating.
- Pick 3% for critical circuits (panels, electronics, nav lights) or 10% for non-critical loads - or set your own.
WORK IT BACKWARDS
- Have a spool already? Enter the AWG and find the maximum run length, or the maximum load current it can carry.
QUICK REFERENCE
- Built-in AWG table: cross-section in mm2, ampacity by temperature rating, and resistance per 1000 ft.
MADE FOR THE JOB
- Big, high-contrast readout that works in a garage or on deck.
- Copy any result to share or save.
- Buy once. No subscription. No ads. Works completely offline, with nothing to sign in to and no data leaving your device.
WireGauge is a planning aid based on ABYC E-11 and standard copper resistance. It is not a substitute for the ABYC standard, a licensed electrician, or local code, and does not size overcurrent protection (fuses/breakers). Always verify before wiring.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Yoshifumi Sato, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Yoshifumi Sato
- Size
- 12 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 WireGauge
