Tech Hub/Calculators

Electronics Calculators

Interactive tools to help you design and troubleshoot your layout's electrical systems. Calculate wire sizes, LED resistors, power requirements, and more.

Wire Gauge Calculator

Find the right wire size for your track bus and feeders based on current and distance.

Current (Amps)

Voltage (V)

One-Way Distance (feet)

Max Voltage Drop % (NMRA TN-9: 5%)

Recommendation

10 AWG

Recommended wire gauge

Voltage Drop:0.102V (0.7%)

Max Current Capacity:30A

Round-Trip Distance:20 ft

NMRA TN-9 Standard: Maximum 5% voltage drop recommended for reliable DCC operation.