By Tom Scalisi | Updated Jun 29, 2022 8:12 AM

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Most folks enjoy a well-manicured lawn with its deep green and lush texture. However, keeping a lawn looking that good requires a reliable mower with a sharp blade. Cutting the grass with anything less will lead to frayed, dry grass blades and damage to the lawn.

But how can a DIY lawn-care expert keep their mower blades sharp? By using the best lawn mower blade sharpener, honing the edge to perfection. The following guide will explain all the need-to-know information about choosing the best lawn mower blade sharpeners as well as identify some top choices in the market.

There’s more to keeping a sharp edge on a lawn mower blade than simply dragging it across a grinder. The following section will explain all the need-to-know information that shoppers must have in order to choose the best tool to sharpen lawn mower blades for their requirements.

When it comes to lawn mower blade sharpeners, there are three basic kinds: those that work with grinders, those that work with drills, and manual options. The models that work with grinders typically attach to them and hold the blade in specific positions. Those that work with drills fit in the chuck and spin a grinder stone at high speed, with the user dragging them across the edge of the blade to revive it. Manual models typically require the user to drag the blade through the sharpener repeatedly to hone the edge.

In terms of speed, users need to consider how much time they wish to spend grinding a mower blade. The models that attach to grinders typically work quickly, as the user can grind more material faster than they can with other models. Those that attach to drills are still relatively fast, though they require constant movement and grind only a very small amount of the blade at a time. Manual models are often extremely slow, requiring 30 minutes or more to hone an edge.

Lawn mower blades aren’t necessarily a one-size-fits-all proposition. For this reason, it’s important that DIYers find a sharpener that can handle a variety of mower blades. For example, models that can handle standard or medium-lift blades, low-lift blades, high-lifts blades, and mulching blades will handle most scenarios with ease. These sharpeners can match the curves or contours of the blade, resulting in a smooth, sharp edge.

Also, consider the sharpener’s versatility. Some mower blade sharpeners can also sharpen knives, scissors, axes, and other tools. On the other hand, some are only capable of sharpening mower blades. It may be worth shopping for a more versatile sharpener in order to keep all of the tools and blades around the house sharp.

Regardless of the type of lawn mower blade sharpener in question, these tools work by removing metal from the blade. To do so, the sharpener itself must be made of a material that is harder than tool steel. The two materials most commonly used for this task are carbide steel and corundum. Carbide steel works well in handheld sharpeners, whereas corundum is a better choice for grinders and drill-type sharpeners due to its ability to sharpen at high speeds. However, the best grinding wheel for sharpening lawn mower blades might contain a mixture of materials.

There are many options to choose from when it comes to guide material. Plastic, steel, and aluminum are all popular choices, and budget will typically determine the material each model features.

Keep in mind that some models come with changeable belts. These belts allow the user to choose the best grit for sharpening lawn mower blades, but also switch to fine grinding work for knives or chisels.

A drill sharpener must be easy to use; otherwise the user will be more likely to purchase a new blade and leave the sharpener stashed in the garage. Sharpeners that are hard to set up, take a lot of practice to use, or simply take forever to achieve the sharp edge the user is looking for aren’t going to cut it.

Alternatively, look for sharpeners that set up easily or, better yet, don’t require any setup at all. The best tool for sharpening lawn mower blades will be easy to use and create consistent results, lessening the amount of time it takes to figure them out.

While lawn mower blade sharpeners aren’t creating razor-sharp blades, there is still some danger involved in blade sharpening. In fact, almost any time there is friction between two pieces of metal (in this case the blade and the sharpener), users should take care.

Users should always wear gloves and eye protection when using sharpeners of any kind. Hearing protection may also be necessary when using a grinder or a drill. When it comes to handheld manual sharpeners, users should keep their fingers behind or inside of the guard in order to protect their fingers.

That’s a lot of information about the best mower blade sharpening tool, and now it’s time to shop. The following are some of the top sharpeners on the market, so be sure to keep the above considerations in mind when comparing these tools.

For those who don’t mind the manual process, this kit from Sharpal is worth a look. This package includes two sharpening tools: one for garden tools like mower blades, axes, and shovels, and one for knives and scissors. The tool sharpener features a carbide sharpening bar specifically designed for honing garden tools.

This kit isn’t just about versatility. The oversize hand guards on both sharpening tools allow users to keep their fingers clear of the blade while wearing gloves. Also, Sharpal tests its materials up to 10,000 times to ensure long-term usability. The only real downside is that manual sharpeners do take considerable time and effort to bring a blade from dull to sharp, though they can be excellent for a quick honing on blades that are still in good shape.

Get the Sharpal lawn mower blade sharpener kit on Amazon.

Manual sharpening can be a pain, but with a tool specifically designed for lawn mower blades like this model from Smith’s, achieving ideal results can come about quickly. This handheld manual blade sharpener features a carbide bar and a preset angle with a guide, which are both ideal for mower blades. The design removes guesswork and makes honing quick and easy.

Unlike basic garden sharpeners, this model features a large, robust design with an oversize blade guard. This makes handling the tool with gloved hands easy while also keeping fingers clear of the blade. There is also a built-in wire brush meant for removing filings from the sharpener, making quick work of jams. Do keep in mind that this tool’s mower blade-specific design does prevent it from sharpening other tools effectively.

Get the Smith’s lawn mower blade sharpener on Amazon.

Folks who want to save money while covering most of their sharpening needs should check out AccuSharp’s Garden Tool Sharpener. This manual model features carbide sharpening bars at a preset angle, allowing users to sharpen everything from mower blades to shovels to pocket knives with just one tool. Even better, that versatility comes at a low price point.

This blade sharpener features a simple, easy-to-use design that the user simply drags across the length of the blade. The oversize handguard keeps fingers and knuckles away from the blade. Just keep in mind that sharpening with a manual sharpener can take a while, so budget some time for honing those mower blades.

Get the AccuSharp lawn mower blade sharpener at Amazon, Ace Hardware, or Tractor Supply Co.

Those who’d like to sharpen their mower blades quickly, efficiently, and accurately should give the Oregon 88-025 Lawnmower Blade Sharpener & Grinder a look. This all-in-one kit comes with the grinder and the bracketry necessary to set up repeatable grinding angles, allowing users to breeze through mower blade sharpening.

This tool comes with a ⅓-horsepower grinder that spins at 1,750 revolutions per minute. It also features an oversize stop button the user can find and hit quickly in the event of an emergency. While it is expensive compared to other sharpening tools, the precise, repeatable results and quick work may make it worth the investment.

Get the Oregon lawn mower blade sharpener on Amazon or at Northern Tool + Equipment.

Work Sharp’s popular sharpening tool can get even better with the Blade Grinder Attachment. This device attaches to the grinder motor in place of the standard bracket, allowing users to dial in the angle more precisely. This works for a wide variety of blades, from lawn mower blades to chisels to knives and more.

Instead of using a grinding wheel or bar, this kit comes with sanding or grinding belts in several different grits. The user can choose coarse grits for quickly restoring an edge and then move to finer grits for a more honed edge. The setup and belt changes are easy, but it will only work with a Work Sharp motorized sharpener.

Get the Work Sharp lawn mower blade sharpener attachment at Amazon, Northern Tool + Equipment, or Work Sharp.

All American Sharpener’s Model 5005 Gen 2 is worth a look for anyone who wants to put a precision edge on their mower blade in as little time as possible. This durable arm bolts directly to a workbench to provide a stable platform for the blade. The grinder then attaches to the arm at an angle chosen by the user. The arm guides the grinder back and forth across the blade’s edge, creating a precision-ground edge in very little time.

This kit adjusts to several angles between 15 and 45 degrees, allowing the user to choose between a razor-sharp edge that may dull sooner or a more utility-type edge that will last longer but not cut as smoothly. While it is easy to set up and use, it does require an angle grinder, and there is always the possibility of injury with those tools.

Get the All American lawn mower blade sharpener on Amazon or All American Sharpener.

If mixing speed and versatility is important, check out Work Sharp’s Mk.2 knife and tool sharpener. This electric motorized sharpener features a motor and pulley system with spinning grinding belts, allowing users to swap between grits quickly for different tools, such as lawn mower blades, knives, scissors, and other items.

The Mk.2 sharpener is equipped with guides at preset angles for use as a benchtop solution, but users can also hold it in hand, grinding across a mower blade or ax head clamped to a stable surface. This tool also has adjustable speeds for working quickly or slowing down for accuracy. Keep in mind that this tool isn’t specifically designed for mower blades, and the preset guides may not match all lawn mower blade types or profiles.

Get the Work Sharp Mk.2 lawn mower blade sharpener on Amazon or at Tractor Supply Co.

Spending longer than necessary sharpening lawn mower blades is a favorite activity of very few folks. For those who’d prefer to get the job done and out of the way, the Double Layer Corundum Lawn Mower Blade Sharpener might be just the ticket. This kit comes with three sets of grinding stones, each of which is preset at 40 degrees for a sharp but durable blade angle.

This kit is easy to set up and use. Simply tighten the grinder wheel’s shaft in the drill chuck, register the blue guide on the mower blade, activate the drill, and guide the stone across the mower blade. The preset angles allow for repeatable results; however, they’re only useful for lawn mowers.

Get the Ankda lawn mower blade sharpener on Amazon.

For those who are looking to mix versatility and value, the Sharpal lawn mower blade sharpener is worth a look, tackling most sharpening tasks with one kit. However, for those looking for repeatable, fast, and accurate results, the All American lawn mower blade sharpener might be the answer.

Choosing the best lawn mower blade sharpeners wasn’t an easy task. We had to draw upon all of our experience with lawn-care equipment and lawn mower maintenance in order to pick out the features we thought were most important to have in a blade sharpener, giving us a foundation to work from.

With those features in mind, we performed extensive product research in order to round up models we felt would hit our criteria. We then compared materials, types, and prices to ensure we were suggesting options that provided actual value. The models that failed this test were discarded, and those that passed were given awards based on their strengths.

Lawn mower blades don’t need to be razor-sharp to be effective. In general, grinding a 35- to 45-degree angle on a lawn mower blade will result in a durable edge that is sharp enough to avoid damaging the grass. Finer angles can dull quickly, while steeper angles will struggle to cut effectively.

Users should be sure to wear gloves and eye protection whenever they’re grinding anything. Small metal shavings can become airborne and embed themselves, causing painful injuries.

Sometimes, speed is the enemy. Grinders that spin too quickly can create excessive heat in the lawn mower blade. Excessive heat may cause the blade to become brittle. Also, keep the blade (or grinder) moving to prevent heat buildup in one area.

Even with all that information on the best lawn mower blade sharpeners, there could still be some questions to chop away at. The following section includes some of the most frequently asked questions about these tools, so be sure to check for an answer to your question listed below.

Frayed or broken blades of grass are a good sign that the blade needs sharpening (they’re also the telltale sign of an inexperienced mower). Also, if the motor starts to bog down or struggle, it could be a sign that the blade isn’t cutting effectively.

Generally speaking, sharpening blades once or twice a growing season will usually do the trick. That said, hitting rocks, logs, and other obstructions will dull a blade right away, so you may have to sharpen more frequently.

Yes, some models can put a serviceable edge on a lawn mower blade without taking them off. Simply turn the mower on its side so that the carburetor is pointing upward and use the sharpener on the blade.

NOTE: Be sure to remove the spark plug wire to prevent an accidental start-up.

Blades that are honed to very fine angles can be too sharp. They’ll cut extremely well at first, but they will dull quickly and then damage the grass. Angles between 35 and 45 are typically best.

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