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How to Sharpen Lawn Mower Blades


If you want to keep your lawn looking its best, it’s important to know how to sharpen lawn mower blades. Dull blades can tear the grass instead of cutting it cleanly, which can lead to brown spots and disease.

The factors to consider when sharpening lawn mower blades include the type of blade, the angle of the blade, the tools you need, and the technique you use.

How to Sharpen Lawn Mower Blades

Type of Blade

There are two main types of lawn mower blades: rotary and reel. Rotary blades are the most common, while reel blades are usually found on push mowers. Before sharpening your blades, it’s important to determine which type you have. Rotary blades have a curved cutting edge, while reel blades have a straight cutting edge.

Angle of Blade

The angle of your lawn mower blade is also important to consider. Most lawn mower blades have a 30 to 45-degree angle, but this can vary depending on the manufacturer and blade type. It’s important to check the owner’s manual or manufacturer’s website to determine the correct angle for your specific blade.

Tools Needed

To sharpen your lawn mower blades, you’ll need a few tools: a socket wrench or pliers to remove the blade, a metal file, a sharpening stone, and safety gloves. It’s also recommended to have a blade balancer to ensure the blade is balanced after sharpening.

Sharpening Technique

Once you have the necessary tools, it’s time to sharpen the blade. First, remove the blade from the lawn mower and secure it in a vice. Use the metal file to sharpen any nicks or dings in the blade.

Then, use the sharpening stone to hone the blade’s edge to the correct angle. It’s important to maintain the original angle of the blade during sharpening. Use long, smooth strokes with the sharpening stone, and be sure to sharpen both sides of the blade evenly.

After sharpening, check the blade balance using a blade balancer. If the blade is unbalanced, it can cause vibrations and damage to the lawn mower.


1. How often should I sharpen my lawn mower blades?

It’s recommended to sharpen your lawn mower blades at least once a year, or more often if you mow frequently or encounter rough terrain.

2. Can I sharpen my lawn mower blades myself?

Yes, you can sharpen your lawn mower blades yourself with the proper tools and technique.

3. How do I know when my lawn mower blades need sharpening?

If your lawn has an uneven or brown appearance after mowing, or if the blades are visibly dull or damaged, it’s time to sharpen them.

4. Can I use a bench grinder to sharpen my lawn mower blades?

While it’s possible to use a bench grinder to sharpen your lawn mower blades, it’s not recommended as it can overheat the blade and damage the tempering.


Learning how to sharpen lawn mower blades is an important part of maintaining a healthy and beautiful lawn. To do so, you need to determine the type of blade and correct angle, acquire the necessary tools, and use the proper sharpening technique.

Regular sharpening can improve the health of your lawn and save you time and money in the long run. Remember to sharpen your blades at least once a year, and check for dullness or damage after each use.


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Helena is a gardening and landscaping expert who appreciates the convenience and efficiency that robotic lawn mowers bring to maintaining a beautiful lawn. With her extensive knowledge of various models and brands, Helena provides valuable recommendations and tips to readers looking to invest in a reliable and efficient robotic lawn mower. She enjoys sharing her expertise, empowering readers to achieve pristine lawns effortlessly.