Method
DC/single-phase drop = 2ILR/1000; balanced three-phase drop ≈ √3 ILR/1000, ignoring reactance and power factor.
Everyday worksheet
Voltage Drop Calculator
Estimate conductor voltage drop, load voltage and power loss from current, one-way length and conductor resistance.
The calculation runs locally. Results include the intermediate values, unit conversions and assumptions needed to audit the answer.
Method, assumptions and practical use
How the Voltage Drop Calculator works
DC/single-phase drop = 2ILR/1000; balanced three-phase drop ≈ √3 ILR/1000, ignoring reactance and power factor. Inputs stay in this browser, and the result table exposes conversions and assumptions for independent checking.
Interpret the result
Percent drop compares conductor loss with source voltage; load voltage is source minus drop.
Check the assumptions
A preliminary resistive estimate cannot replace electrical code, conductor ampacity, temperature, reactance or licensed design review.
Local calculation
Everything runs in this browser. Inputs are not sent to an external calculator.
Rounding
Displayed values may be rounded for readability while calculations use full floating-point precision unless the tool explicitly uses exact integers.
Scope
A preliminary resistive estimate cannot replace electrical code, conductor ampacity, temperature, reactance or licensed design review.
Simple by design
Three steps to a clearer number.
Enter your details
Use realistic values in each field. You can change them anytime.
Calculate instantly
The formula runs locally, so there is no account or waiting time.
Use the result
Treat the answer as a practical estimate for your next decision.