Should I use a 12-gauge or 10-gauge extension cord for a table saw?

12-gauge will handle 15 amps at 50 feet for a table saw with a safe 3–4% voltage drop. But 10-gauge is overkill in a good way—it drops less voltage (around 2%) and is ready if you upgrade to a bigger saw or run it 100 feet. Either works fine, but 10-gauge works a little better for a little more cost.