How to Sharpen a Lawn Mower Blade

Is your mower not cutting too well? Give it a quick sharpening. Follow our guide to get the job done—your lawn will thank you.

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When your lawn mower isn't making the cut, all it needs is a minor tune up. Sharpening your lawn mower blade is easier than you think, and takes a fraction of the time it takes to actually mow your lawn. Follow our quick and easy guide to make your lawn mower work like new.

See our lawn mower maintenance guide.

Editor's Tip: Not sure if your blade needs sharpening? Most experts recommend sharpening mower blades twice a season. If your lawn isn't looking as crisp as it once did, chances are it's time to sharpen the mower blade.

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What You Need

  • Wrench
  • Medium file (or sharpening power tool)

Step 1: Remove Blade from Mower

Disconnect the spark plug or unplug the mower. Turn the mower over and remove the nut that attaches the blade to the motor. Then, remove the blade from the mower.

Step 2: File Blade

Stabilize the blade in a vise and use a medium file or a sharpening power tool to smooth out imperfections along the blade edge (at the ends of mulching blades). Don't try to hone a sharp edge.

Step 3: Check for Balance

After you smooth the cutting edge on both halves of the blade, check to see if the blade is balanced. If not, remove more metal from one of the halves until the blade does balance.

Step 4: Reassemble Mower

When the blade is correctly balanced, put the mower blade back onto the mower using a wrench. Be sure to tighten the nut securely back into place.

Not enough time to mow? Hire a lawncare service.

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