Free professional calculators for DC and AC electrical systems. Choose your voltage level for optimized wire sizing with NEC compliance checking.
For automotive, solar, RV, marine, and battery-powered systems.
Automotive, RV, marine, and small solar systems.
Trucks, medium solar systems, and industrial controls.
Large solar, telecom, data centers, and golf carts.
For residential, commercial, and industrial AC power systems.
Standard residential outlets and lighting circuits.
Dryers, ranges, HVAC, EV chargers, and pool equipment.
Commercial and industrial three-phase systems.
Complete voltage drop calculator with charts, PDF export, project management, and all voltage options.
Calculate the minimum wire size needed for your circuit based on amperage and distance.
Specialized calculator for DC circuits with custom voltage input.
Single-phase and three-phase AC voltage drop calculations.