Calculator category
Electrical Calculators
Calculate voltage, current, resistance, and wire specifications.
About electrical calculators
Electrical calculators help electricians, engineers, and hobbyists solve circuit problems, size wires correctly, and estimate energy costs. From basic Ohm's law calculations to NEC-compliant wire sizing and conduit fill calculations, these tools ensure safe and code-compliant electrical work.
Available calculators (17 total)
Safety first
These calculators provide estimates based on standard formulas and NEC guidelines. Always verify results with a licensed electrician before making installations. Electrical work can be dangerous — never work on live circuits, and always follow local building codes and regulations.
Understanding electrical units
Voltage (V) is electrical pressure, current (A) is flow rate, resistance (Ω) opposes flow, and power (W) is the rate of energy use. Ohm's law (V = I × R) relates the first three, while power formulas (P = VI, P = I²R) connect all four. Understanding these relationships is key to safe electrical design.