Electrician's Calculator

Enter your load details and we'll find the right wire size for you, keeping voltage drop within NEC's 3% recommendation.

Phase Single Phase Three Phase

System Voltage (V)

Load Current (Amperes)

One-Way Run Length (Feet)

Conductor Material Copper Aluminum

Find Wire Size & Voltage Drop

Load Current (Amperes)

Temperature Rating 60°C 75°C 90°C

Material Copper Aluminum Copper-Clad Aluminum

Current-Carrying Conductors

Calculate Wire Size

Conduit Type EMT PVC RMC (Rigid) IMC FMC (Flex) LFMC (Liquidtight Flex) ENT LFNC (Liquidtight Nonmetallic)

Conduit Size 1/2" 3/4" 1" 1-1/4" 1-1/2" 2" 2-1/2" 3" 3-1/2" 4" 5" 6"

Conductor Size 14 AWG 12 AWG 10 AWG 8 AWG 6 AWG 4 AWG 3 AWG 2 AWG 1 AWG 1/0 AWG 2/0 AWG 3/0 AWG 4/0 AWG 250 kcmil 300 kcmil 350 kcmil 400 kcmil 500 kcmil 600 kcmil 700 kcmil 750 kcmil 800 kcmil 900 kcmil 1000 kcmil

Number of Conductors

Insulation Type THHN/THWN/THWN-2 XHHW/XHHW-2 THW/THW-2 RHH/RHW-2 USE-2 TW

Calculate Conduit Fill

Phase Single Phase Three Phase

Voltage 115V 230V 208V 460V 575V

Horsepower 1/6 HP 1/4 HP 1/3 HP 1/2 HP 3/4 HP 1 HP 1.5 HP 2 HP 3 HP 5 HP 7.5 HP 10 HP 15 HP 20 HP 25 HP 30 HP 40 HP 50 HP 60 HP 75 HP 100 HP

Duty Continuous Duty Non-Continuous

Calculate Motor Load

Calculate bend marks, shrink, and developed length for every common conduit bend. Bender deducts auto-fill from the table for the selected tool/conduit/size.

Desired Stub Height (inches)

Custom Deduct (optional, inches)

Calculate Stub-Up

Stub Height (inches)

Back-to-Back Distance (inches)

Calculate Back-to-Back

Offset Depth / Rise (inches)

Bend Angle 10° 22.5° 30° 45° 60°

Distance From End to First Bend (optional, inches)

Calculate Offset

Obstacle Height / Diameter (inches)

Distance From End to Center of Obstacle (inches)

Saddle Configuration 45° / 22.5° / 22.5° (most common — 2.5× spacing, 3/16"/in shrink) 60° / 30° / 30° (2× spacing, 1/4"/in shrink)

Calculate 3-Bend Saddle

Obstacle Height / Rise (inches)

Obstacle Width (inches)

Bend Angle 22.5° 30° 45°

Distance From End to Front of Obstacle (inches)

Calculate 4-Bend Saddle

Vertical Rise (inches)

Lateral Roll (inches)

Bend Angle 22.5° 30° 45° 60°

Distance From End to First Bend (optional)

Calculate Rolling Offset

Innermost Centerline Radius (inches)

Center-to-Center Spacing (inches)

Number of Parallel Pipes

Calculate Concentric Bends

Total Bend Angle (degrees)

Per-Segment Angle (degrees)

Centerline Radius (inches)

Calculate Segment Bend

Sum the degrees of every bend in your run to verify NEC's 360°-between-pull-points limit. Add as many rows as needed.

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+ Add Bend Check Total

Ask any question about the National Electrical Code (NEC 2023). Answers are sourced directly from the code book with section citations.

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