Wire & Load

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.