Lineman Apps Digital Apprentice LLC

Lineman's Calculator

The math you actually need at the pole. Transformer ampacity, voltage drop, wire ampacity, sag and tension, capacitor testing and power factor correction, and a ferroresonance risk model you won't find in any other calculator.

Every answer shows the formula it used, so you can check it by hand and see where the numbers came from. Every calculator, excluding Ferroresonance, is backed by proven data in the industry.

Free · no subscription No account Works offline Tiny download
Lineman's Calculator app icon: a gold Digital Apprentice delta over the word CALC

Ten calculators, tailored to linework

Ohm's Law
V · I · R · P
Voltage Drop
AWG · length · %VD
XFMR Full Amps
kVA · kV → A
Pri / Sec Amp Conversion
I₁V₁ → I₂
Turns Ratio
a · V₁ · V₂
Wire Ampacity
Bare OH copper, AAC, AAAC, and ACSR
Service Wire Size
kVA → min wire
Ferroresonance RiskOnly here
Bank resonance risk
Sag / Tension
Span · w · T → D
Capacitors
PF · cap test range