Voltage Drop Calculator
This calculator requires the use of
Javascript enabled and capable browsers. This is designed to give the
approximate loss factors in a circuit (AC or DC), including type of circuit,
AWG (or KCMIL), amperage, length of circuit and type of conductor, for wire
or circuit board. Enter the required data and click on Calculate. The
results are returned as the estimated drop in voltage (the amount of voltage
loss from original input in a conductor of given size and length), drop
percentage, the load at most distant point in the circuit, and the conductor
CMA. If you need to calculate the size of the wire, you might want to
consider using our wire size calculator. We strongly suggest that you use
the results here as they are intended, estimates. In the actual electronic
and electrical tests in both commercial and residential, AC and DC
applications, our calculations have been within one percent of the MEASURED
voltage drop in every instance we have had the opportunity to check them.
That track record is far better than the national code for acceptable
deviation. We have had one note that implied that code formulae and
practices, and our method for calculation were very different and yielded
substantial differences. Although the note did not say that they had
MEASURED the voltage drop and that our calculations were incorrect, the
implication was there. For the sake of prudence and in order to comply with
national and local code, secure the services of a qualified professional in
your area.
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