Electrical Power & Distribution Calculators
Voltage drop, conductor sizing, conduit fill, power factor correction and transformer capacity — the checks that decide whether an installation works once it is energised.
Voltage Drop Calculator
Calculate conductor voltage drop and the voltage actually delivered to the load for single-phase, three-phase and DC circuits.
dV = k x I x R x L, with k = 2 for DC/single-phase and 1.732 for three-phase Wire Sizing Calculator
Size an electrical conductor from both its ampacity and its voltage drop over the run, and see which of the two governs.
R_max = (p/100) x V x 1000 / (k x I x L); the smallest standard size with R <= R_max and ampacity >= I is selected Conduit Fill Calculator
Check electrical conduit fill against the permitted percentage and find the smallest standard conduit that accepts the conductors.
fill% = (n x A_conductor) / A_conduit x 100, limited to 53% / 31% / 40% for 1 / 2 / 3 or more conductors Power Factor Correction Calculator
Calculate the reactive power in kVAr that must be removed with capacitors to reach a target power factor.
Qc = P x (tan acos(pf1) - tan acos(pf2)) Transformer Sizing Calculator
Select the next standard transformer rating from connected load, demand factor and a future growth allowance.
S_standard >= S_connected x demand factor x (1 + growth)