Electrical calculators that cite the table

Voltage drop, wire size, conduit fill, box fill, 12 V runs, motor FLA. Every value names its NEC table, edition and source; rows that could not be verified say so. Nothing typed leaves the browser, and every answer is a link.

The gauge · copper at 75 °C, Table 310.16tap a slot for the full sizing

Calculators

Voltage drop calculatorK-factor · Table 9
Wire size calculator310.16 · corrections
Conduit fill calculatorChapter 9 Tables 1, 4, 5
Box fill calculator314.16
12 V wire size calculator12 · 24 · 48 V
Ohm’s law calculatorV · I · R · P
Watts to amps calculator1φ · 3φ · DC
Amps to watts calculator1φ · 3φ · DC
kVA calculatorkVA · kW · kvar
Motor FLA calculator430.248 · 430.250

Wire size for a given breaker

15 A
20 A
30 A
40 A
50 A
60 A
70 A
80 A
100 A
125 A
150 A
200 A
225 A
250 A
300 A
400 A

What electrical work costs

Published ranges from named, dated sources, aggregated; never a single invented number.

Electrical panel upgrade costdated range
EV charger installation costdated range
Outlet installation costdated range
Cost to rewire a housedated range
Ceiling fan installation costdated range
Generator transfer switch costdated range

Deutsch

Kabelquerschnitt berechnenDIN VDE 0298-4
Spannungsabfall berechnenDIN 18015
Wallbox-Kabelquerschnitt11 kW · 22 kW

Method

Which edition, which table, which source, and what could not be verified: the method page. This site does not replace the NEC, the authority having jurisdiction or a licensed electrician; local amendments apply.