Trades & Contractor Calculators

Practical calculation tools for electricians, drywallers, flooring installers, masons, plumbers, and movers. Sizing for wire gauge, tile, drywall sheets, concrete, HVAC BTUs, moving supplies, and pipe velocity.

Wire Gauge & Voltage Drop

NEC-compliant conductor gauge (AWG) sizing and voltage drop percentage.

Circuit Configuration

NEC 310.16 compliant conductor sizing and voltage drop calculation.

Source Voltage

Electrical Phase

Full Load Amperes (I)

Amps

5 Amps200 Amps

One-Way Distance to Load

10 ft1,000 ft

Conductor Material

Copper (Cu)Aluminum (Al)

Max Allowed Drop

Wire Sizing & Drop Analysis

NEC Compliant (< 3%)

Recommended Wire SizeNEC Compliant (< 3%)

8 AWG

Upsized from 14 AWG to prevent voltage drop over 100 ft.

Voltage Drop

2.60%

3.1 Volts drop

Voltage at Load

116.9 V

From 120V supply

Engineering Data

Conductor Area:	16,510 Circular Mils
Rated 75°C Ampacity:	50 Amperes
Power Dissipation:	63 Watts

NEC 210.19(A): Keeping voltage drop under 3% preserves motor life, prevents dimming lights, and ensures electronics function reliably.