Wire Size & Voltage Drop Calc

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Everyone
10+
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Content rating
Everyone
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About this app

Calculate voltage drop, minimum conductor size, maximum run length, conductor resistance and power losses from transparent physical formulas.

Choose IEC or AWG/KCMIL conductors, enter current or load power, include power factor, cable reactance and parallel runs, compare adjacent sizes and estimate annual energy cost.

Save calculations into projects, reopen them with every input restored and share results from the job site.

The app works offline and does not reproduce code ampacity tables or recommend circuit breaker ratings.
Calculate wire size, voltage drop, resistance and cable energy losses offline.
Updated on
Aug 20, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • This app may share these data types with third parties
    Location, App activity and 2 others
  • This app may collect these data types
    Location, App activity and 2 others
  • Data is encrypted in transit

What’s new

First release: wire sizing, voltage drop and more electrical calculators, all fully offline.