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Electrical
Electrical calculators for conduit fill, wire sizing, voltage drop, box fill, and residential load calculations
Instant Answers
Pre-calculated results for common scenarios
wire sizing
20 Amp 120V Wire Size (Copper)30 Amp 240V Wire Size for Dryer (Copper)40 Amp 240V Wire Size for Range (Copper)50 Amp 240V Wire Size (Copper)60 Amp 240V Sub-Panel Wire Size (Copper)100 Amp 240V Sub-Panel Wire Size (Copper)200 Amp 240V Main Service Wire Size (Copper)20 Amp 240V Wire Size (Copper)15 Amp 120V Wire Size for Lighting (Copper)50 Amp 240V Wire Size (Aluminum)100 Amp 240V Sub-Panel Wire Size (Aluminum)200 Amp 240V Main Service Wire Size (Aluminum)30 Amp 120V Wire Size (Copper)40 Amp 120V Wire Size (Copper)70 Amp 240V Wire Size (Copper)80 Amp 240V Wire Size (Copper)150 Amp 240V Service Wire Size (Copper)60 Amp 240V Sub-Panel Wire Size (Aluminum)150 Amp 240V Service Wire Size (Aluminum)30 Amp 240V Wire Size for Dryer (Aluminum)20 Amp 120V Wire Size High Temperature (Copper)50 Amp 240V Wire Size 6 Conductors (Copper)20 Amp 120V Wire Size THWN-2 (Copper)30 Amp 240V Wire Size XHHW-2 (Copper)50 Amp 240V Wire Size Hot Attic (Copper)100 Amp 240V Wire Size 6 Conductors (Copper)15 Amp 120V Wire Size (Aluminum)40 Amp 240V Wire Size for Range (Aluminum)20 Amp 240V Wire Size (Aluminum)80 Amp 240V Wire Size (Aluminum)
voltage drop
Voltage Drop for 15A Circuit at 25 Feet with 14 AWGVoltage Drop for 15A Circuit at 50 Feet with 14 AWGVoltage Drop for 20A Circuit at 50 Feet with 12 AWGVoltage Drop for 30A Circuit at 50 Feet with 10 AWGVoltage Drop for 20A Circuit at 25 Feet with 12 AWGVoltage Drop for 20A Circuit at 75 Feet with 12 AWGVoltage Drop for 20A Circuit at 100 Feet with 10 AWGVoltage Drop for 30A Circuit at 100 Feet with 8 AWGVoltage Drop for 15A Circuit at 100 Feet with 12 AWGVoltage Drop for 20A Circuit at 150 Feet with 10 AWGVoltage Drop for 30A Circuit at 75 Feet with 10 AWG at 240VVoltage Drop for 20A Circuit at 125 Feet with 10 AWGVoltage Drop for 20A Circuit at 200 Feet with 8 AWGVoltage Drop for 30A Circuit at 200 Feet with 6 AWGVoltage Drop for 30A Circuit at 150 Feet with 6 AWGVoltage Drop for 20A Circuit at 150 Feet with 8 AWGVoltage Drop for 15A Circuit at 200 Feet with 10 AWGVoltage Drop for 30A Circuit at 250 Feet with 6 AWG at 240VVoltage Drop for 50A Circuit at 75 Feet with 8 AWG at 240VVoltage Drop for 50A Circuit at 100 Feet with 6 AWG at 240VVoltage Drop for 50A Circuit at 150 Feet with 4 AWG at 240VVoltage Drop for 100A Circuit at 100 Feet with 2 AWG at 240VVoltage Drop for 50A Three-Phase at 100 Feet with 8 AWGVoltage Drop for 100A Three-Phase at 100 Feet with 2 AWGVoltage Drop for 75A Three-Phase at 150 Feet with 4 AWG at 480V
conduit fill
Conduit Fill: 3 #12 THHN in 1/2" EMTConduit Fill: 3 #14 THHN in 1/2" EMTConduit Fill: 4 #12 THHN in 3/4" EMTConduit Fill: 6 #12 THHN in 3/4" EMTConduit Fill: 9 #12 THHN in 1" EMTConduit Fill: 7 #10 THHN in 1" EMTConduit Fill: 3 #10 THHN in 3/4" EMTConduit Fill: 4 #8 THHN in 1-1/4" EMTConduit Fill: 3 #12 THHN in 1/2" PVC Schedule 40Conduit Fill: 4 #12 THHN in 3/4" PVC Schedule 40Conduit Fill: 6 #12 THHN in 1" PVC Schedule 40Conduit Fill: 4 #10 THHN in 1" PVC Schedule 40Conduit Fill: 4 #8 THHN in 1-1/4" PVC Schedule 40Conduit Fill: 4 #2 THHN in 2" PVC Schedule 40Conduit Fill: 4 #2 THHN in 2" EMTConduit Fill: 3 #1/0 THHN in 2" EMTConduit Fill: 3 #4/0 THHN in 2-1/2" EMTConduit Fill: Mixed 2 #10 + 3 #12 THHN in 1" EMTConduit Fill: Mixed 3 #8 + 2 #10 THHN in 1-1/4" EMTConduit Fill: Mixed 2 #12 + 2 #14 THHN in 3/4" EMT
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Conduit Fill Calculator
Calculate maximum wire fill for conduits according to NEC Chapter 9 requirements
NEC 2023 Chapter 9 Table 1NEC 2023 Annex C
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Wire Sizing Calculator
Determine proper wire gauge based on ampacity, length, and temperature rating per NEC Article 310
NEC 2023 Article 310NEC 2023 Table 310.16
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Voltage Drop Calculator
Calculate voltage drop in electrical circuits to ensure compliance with NEC recommendations
NEC 2023 Article 210.19NEC 2023 Article 215.2
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Box Fill Calculator
Calculate maximum number of conductors allowed in junction boxes per NEC Article 314.16
NEC 2023 Article 314.16NEC 2023 Table 314.16(A)
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Residential Load Calculator
Calculate total electrical load for residential services using NEC Article 220 methods
NEC 2023 Article 220NEC 2023 Article 220.82
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Conduit Bending Calculator
Calculate bend measurements for conduit installations including offsets, kicks, and saddles
NEC 2023 Article 344Electrician's Guide to Conduit Bending