Electrical Cable Calculator Jun 2026
| Load | Breaker | 120V (max ft) | 240V (max ft) | |------|---------|---------------|---------------| | 15 A | 15 A | 14 AWG / 70 ft | 14 AWG / 140 ft | | 20 A | 20 A | 12 AWG / 60 ft | 12 AWG / 120 ft | | 30 A | 30 A | 10 AWG / 55 ft | 10 AWG / 110 ft | | 40 A | 40 A | 8 AWG / 70 ft | 8 AWG / 140 ft | | 50 A | 50 A | 6 AWG / 80 ft | 6 AWG / 160 ft |
Calculate voltage drop:
Sarah narrowed her eyes. She wasn't an electrician, but she was a research analyst. "Are you sure? That saw looks heavy. Does the wire size matter for the distance?" electrical cable calculator
If you are running a wire more than 20 feet, or powering a heavy motor (like a table saw, AC unit, or hot tub), guessing is a gamble. The calculator tells you exactly what you need to ensure the power arrives at the destination as strong as it left the panel. | Load | Breaker | 120V (max ft)
Using the wrong cable size is not just a technical error; it is a major safety risk. Professional tools like the Eland Cables Calculator or ELEK Software help prevent several critical issues: That saw looks heavy
Elias realized his mistake. He had been thinking about safety (not catching fire), but not efficiency (delivering the power). The wire was "technically" safe enough not to burn immediately, but it was too thin to carry the heavy current that distance. The saw starved, drew more amps to compensate, and tripped the breaker.
Would you like a simplified or an Excel-based calculator template to build yourself?
