Wire & Load
Wire size, breaker, drop
Free · In-App Purchases · Designed for iPad. Not verified for macOS.
The offline electrician's calculator — wire size, voltage drop, and breaker rating per NEC 2023. Try free for 7 days, then $1.99 lifetime.
Stop guessing the right wire size. Wire & Load is the no-internet-needed reference every electrician and maintenance tech wants in their pocket.
GET AN INSTANT RECOMMENDATION for AWG / mm² wire size, voltage drop percentage, and the matching standard circuit breaker — driven by NEC 2023 / 75°C ampacity tables and the 240.6(A) breaker series.
WHAT'S INSIDE
• Voltage-drop calculator — single- and three-phase, copper or aluminum
• Configurable voltage-drop limit (0.5% – 10%)
• NEC 240.4(B) next-size-up breaker rule applied automatically
• 60°C limits for 14/12/10 AWG copper and 12/10 AWG aluminum pre-applied per NEC 240.4(D)
• Continuous-load (≥ 3 hr) 1.25× multiplier toggle
• Power-mode input — enter watts and power factor, the app derives the working current
OFFLINE REFERENCE TABLES
• AWG ↔ mm² ↔ diameter (ASTM B258)
• Copper and aluminum ampacity (NEC 310.16, 75°C)
• Standard breaker sizes (NEC 240.6(A))
• Motor starting inrush multipliers — DOL, star-delta, soft starter, VFD (NEMA MG-1)
DESIGNED FOR THE FIELD
• Works on any job site, no signal needed
• Search built into every reference table
• Both AWG and mm² always shown on results
• Switch between metric (mm² / m) and imperial (AWG / ft)
• Localized in English, Spanish, Japanese, French, German, and Portuguese
PRIVACY FIRST
No accounts. No analytics. No ads. No tracking. Your inputs never leave your device.
PRICING
Try Wire & Load free for 7 days. After that, unlock lifetime access for a single $1.99 purchase — no subscription, no recurring charges, free updates.
DISCLAIMER
This app provides general reference information based on commonly-used electrical engineering tables and formulas. Results are estimates and do not constitute professional engineering advice. Always follow the electrical code applicable in your jurisdiction and consult a licensed electrician or engineer.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
The developer, Shenzhen Fu Kang Heng Development Co., Ltd., 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
- Size
- 2.7 MB
- Category
- Utilities
- Compatibility
Requires iOS 16.6 or later.
- iPhone
Requires iOS 16.6 or later. - iPad
Requires iPadOS 16.6 or later. - Mac
Requires macOS 13.5 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 5 more
- English, French, German, Japanese, Portuguese, Spanish
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Lifetime Access 19,00 kr
- Provider
Shenzhen Fu Kang Heng Development Co., Ltd.
- Shenzhen Fu Kang Heng Development Co., Ltd. has identified itself as a trader for this app and confirmed that this product or service complies with European Union law.
- DUNS Number
403469126 - Address
China Mainland
GUANGDONG
Shenzhen
Room 201, Building A, No. 1 Qianwan First Road, Qianhai
518114 - Phone Number
+86 13632816303 - Email
caofugui888@outlook.com
- Copyright
- © 2026 Cao Fugui