All calculators

Ten calculators over the NEC tables, plus a German section on the DIN VDE tables.

• Voltage drop calculatorK-factor · Table 9Voltage drop calculator for copper and aluminum, 14 AWG to 1000 kcmil, single- and three-phase, with the K-factor result and the NEC Chapter 9 Table 9 impedance result side by side, the 3 % / 5 % notes explained, and every table cited..
• Wire size calculator310.16 · correctionsNEC wire size calculator: minimum copper or aluminum conductor for a load by Table 310.16 at 60, 75 or 90 °C, with ambient temperature correction, conductor-count adjustment, the 110.14(C) termination cap, 240.4(D) small-conductor limits and an optional voltage-drop check..
• Conduit fill calculatorChapter 9 Tables 1, 4, 5Conduit fill calculator for EMT, PVC 40 and 80, RMC, IMC, FMC, ENT, LFMC and LFNC by trade size, with THHN, THWN, XHHW, THW, TW, RHW and compact conductors: percent fill against the 53 / 31 / 40 % limits of NEC Chapter 9 Table 1, using Table 4 and Table 5 areas, cited..
• Box fill calculator314.16NEC 314.16 box fill calculator: conductor volume allowances by size, internal clamps, support fittings, device yokes and equipment grounding conductors, the required cubic inches, and the Table 314.16(A) metal boxes that fit..
• 12 V wire size calculator12 · 24 · 48 V12 volt wire size calculator for automotive, solar, RV and marine runs: minimum AWG for a 3 % (or 2, 5, 10 %) voltage drop from NEC Chapter 9 Table 8 resistance, with the drop, load voltage and power lost for any size you compare..
• Ohm’s law calculatorV · I · R · POhm’s law calculator: enter any two of voltage, current, resistance and power and read the other two, with the formula used for each.
• Watts to amps calculator1φ · 3φ · DCConvert watts to amps for DC, single-phase and three-phase AC with power factor: I = P ÷ (V × PF), or ÷ (√3 × V × PF) for three-phase, plus the 125 % continuous-load figure and apparent power in VA..
• Amps to watts calculator1φ · 3φ · DCConvert amps to watts for DC, single-phase and three-phase with power factor: P = V × I × PF, or √3 × V × I × PF for three-phase, with kW, VA and kWh per hour..
• kVA calculatorkVA · kW · kvarkVA calculator: apparent power from volts and amps, or from kW and power factor, single- and three-phase, with kW, kvar, line current and the next common transformer rating..
• Motor FLA calculator430.248 · 430.250Motor full-load current from NEC Table 430.248 (single-phase) and 430.250 (three-phase) by horsepower and voltage, with 430.22 conductor ampacity at 125 % and Table 430.52 maximum breaker and fuse sizes..
• Kabelquerschnitt berechnenDIN VDE 0298-4
• Spannungsabfall berechnenDIN 18015
• Ampere berechnenWatt ↔ Ampere
• Wallbox-Kabelquerschnitt11 kW · 22 kW