Electric Lawn Mower
What size extension cord for a Electric Lawn Mower?
A electric lawn mower draws about 12 amps (1440W) at 120V. To carry that safely you need at least 12 AWG copper, and even then only for short runs, up to roughly 100 ft before voltage drop and heat become a problem. Thinner cord (the common 16 AWG household type) can overheat under this load and is a fire risk.
Cord gauge by length for a electric lawn mower
The longer the cord, the thicker it must be to keep voltage drop under 3% at 12A. Minimum recommended copper gauge by run length:
| Cord length | Minimum gauge | Notes |
|---|---|---|
| 25 ft | 12 AWG | Minimum safe gauge |
| 50 ft | 12 AWG | Minimum safe gauge |
| 100 ft | 10 AWG | Upsized for the longer run |
| 150 ft | 10 AWG | Upsized for the longer run |
Safety note
Electric mowers need a long outdoor-rated cord. Use 12 AWG for up to 100 ft. Always use GFCI protection outdoors.
Why gauge matters
A smaller AWG number means thicker copper and lower resistance. Undersized cord drops voltage (making motors and heating elements work harder) and turns the lost energy into heat in the cord itself. At 12A, a too-thin or coiled cord can get hot enough to melt insulation. Always uncoil cords fully during use, and never chain two cords together for a high-draw electric lawn mower.
Frequently asked questions
What gauge extension cord for a electric lawn mower?
Use at least 12 AWG copper for a electric lawn mower (12A). For runs longer than 100 ft, step up to the next thicker gauge to hold voltage drop under 3%.
How long can the extension cord be?
At 12 AWG, keep it to about 100 ft for a electric lawn mower. Beyond that, use a thicker cord: see the gauge-by-length table above.
Can I use a regular 16 AWG cord?
No. A standard 16 AWG household cord is not rated for the 12A a electric lawn mower draws and can overheat. Use 12 AWG or thicker, and ideally plug the electric lawn mower directly into a wall outlet.
Disclaimer: For reference only. Consult a licensed professional.