12-gauge vs 10-gauge extension cord for a 15-amp miter saw at 50 feet: 12 AWG is the minimum, 10 AWG is better for safety margin

12 AWG is the minimum for a 15-amp miter saw at 50 feet, but 10 AWG is better if you can find it without spending a fortune. A 14-gauge cord will heat up and risk voltage drop, breaker trips, or saw damage over time. The price difference between 12 and 10 AWG isn’t huge, and the heavier cord gives you a real safety margin.