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Building the Standard for Electrical Accuracy

Empowering professionals with precision tools grounded in the National Electrical Code.

Our Mission

To make professional-grade electrical calculations accessible, transparent, and accurate. We eliminate guesswork, helping you design safer and more efficient systems compliant with industry standards.

Precision First

Our algorithms strictly adhere to NEC Chapter 9 Table 9 resistance values, ensuring your calculations match official standards down to the decimal.

Engineered for You

Designed for the field and the office. Our responsive interface works flawlessly on mobile devices, tablets, and desktops.

Open & Free

We believe safety tools should be accessible to everyone. No paywalls, no subscriptions—just reliable engineering resources.

Why Trust Us?

Voltage Drop Calculator is maintained by a team of software engineers and electrical enthusiasts. We rigorously test our tools against manual calculations and industry benchmarks.

  • NEC Compliance: We use the standard Direct Current (DC) and Alternating Current (AC) resistance formulas.
  • Transparency: All formulas are published on our Formulas page so you can verify the math yourself.
  • Continuous Improvement: We actively listen to user feedback to refine our features and accuracy.

Professional Note

This tool is designed for estimation and educational purposes. While we strive for maximum accuracy, electrical systems possess variables that a calculator cannot always predict. Always verify critical designs with a licensed professional and reference the latest National Electrical Code (NEC).