What Lawn Mower Blade Size Do I Need?

(Last Updated On: August 21, 2020)

Lawnmowers are quite important for your land. They clean up your land and make it look neat and tidy. A mower comes with a bunch of small components, and the most important ones are their blades. The cutting blades of a mower are the ones that perform the basic function of them, so replacing them every now and then is something you shouldn’t ignore. Now, if you’re thinking of changing your lawnmower blades and have no idea which size to go for, you’re at the right place. Have a look at a bunch of tips down below regarding what lawnmower blade size you need.

Deck Size

Now you might not know this. However, the Size of a mowers blade is directly linked to the mowers deck. You’ll have to do a bit of digging to choose the right blade size for your mower. The replacement blades will be the same size as the deck. Make sure you choose the right ones!

Have A Look At The User’s Manual

The next thing you can do is have a look at the user manual. The manual will contain all the information regarding your mower and its replacement parts. It’ll also tell you the model number of blades needed. If you use different blades than those recommended, your mower might get damaged.


Another thing you need is some measurements. Have a look down below:

  • The length of the blade that is measured diagonally from cutting tip to tip
  • You’ll also need the diameter of the centre hole
  • The type of centre hole
  • The diameter of the outer holes
  • The width of the blade that is measured at its centre
  • The thickness of the blade that is measured at the centre of the blade


Other than choosing the right blade size, here are a few tips in order to take care of them as well.

Sharpen Your Blades

The first and basic thing you need to do is to sharpen your blades. Blades perform the main function of a mower, and it’s a must for you to sharpen them every now and then. Or else you’ll need to get new ones that’ll cost you loads of amount if you don’t have a warranty. However, don’t end up sharpening them too much either since that can have an impact on the functionality of your mower.

Replacing Them

Since blades perform the main function, keep an eye on their performance. If you feel like they’re not performing well, it’s either because they need to be sharpened or need replacement. When replacing your blades, keep a few things in mind. Firstly, make sure you choose the right Size. You can do this by following the tips mentioned above. Other than that, have a look at the model of your old blade and get the exact same one.


Follow all the tips mentioned above, and they’ll result to be quite convenient for you!



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