Ohms Law Calculator: Wire Size

Every electrical calculation in one fast, offline app. 180 calculators for electricians, apprentices, engineers and DIYers: Ohm's law, wire size, voltage drop, conduit fill and much more. Results update live as you type.

FREE CALCULATORS
• Ohm's law and power: volts, amps, ohms, watts
• Voltage drop calculator
• Wire size and ampacity (AWG, kcmil, mm²), EGC size
• Conduit fill and box fill
• Breaker and fuse size
• kW to amps, amps to watts, 3-phase power
• Resistor color code and LED resistor
• Offset bends and unit conversions

PRO CALCULATORS
• Derating for bundling and ambient temperature
• Parallel conductor sets and the 83 % rule
• Exact AC voltage drop with impedance
• Ground rods, fault current, arc flash boundary
• Conduit bending: saddles, rolling and parallel offsets
• Cable tray, wireway and jam ratio
• Motor overload and transformer fault current
• Residential and commercial load calculations
• Solar PV strings and EV charging
• IEC correction factors, PE size and loop impedance

BUILT FOR THE JOBSITE
• Works offline, no account, no ads
• Based on NEC tables (310.16, Chapter 9) with IEC options
• US and metric units, light and dark theme
• Find any calculator in seconds with search and favorites

PRO ACCESS
Unlock all Pro calculators with a yearly subscription that renews automatically until you cancel, or with a one-time lifetime purchase that never renews. The price is shown in your local currency before you buy. Manage or cancel the subscription anytime in Google Play. Purchases can be restored on a new device.

Results are for reference; always verify against the code adopted by your local authority.
Not affiliated with NFPA. NEC® and National Electrical Code® are registered trademarks of the National Fire Protection Association.

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