Updated October 2021
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BestReviews spends thousands of hours researching, analyzing, and testing products to recommend the best picks for most consumers. We only make money if you purchase a product through our links, and all opinions about the products are our own. Read more  
BestReviews spends thousands of hours researching, analyzing, and testing products to recommend the best picks for most consumers. We buy all products with our own funds, and we never accept free products from manufacturers.Read more 
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Best of the Best
DEWALT FLEXVOLT Cordless 15" String Grass Trimmer
FLEXVOLT Cordless 15" String Grass Trimmer
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Bottom Line

High-efficiency brushless motor can handle all your tough trim jobs.


Two trim lines and ergonomic design can help you tackle difficult trim projects. Cordless trimmer cuts are just as powerful as any gas model. Two power settings can tackle any weed issues you may have. 3 amp hour battery and charger included.


Small safety guard may be a concern.

Best Bang for the Buck
DEWALT XR Brushless 13" String Grass Trimmer
XR Brushless 13" String Grass Trimmer
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This value-priced weed eater by DEWALT is efficient and durable.


Brushless motor provides durability. Weed eater weighs only 8.5 pounds, making it easy to maneuver. Hi-Lo speed options allow you to adjust control based on your environment. 20-volt battery and charger included.


String tends to break off very easily.

DEWALT 40V String Trimmer
40V String Trimmer
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Bottom Line

Cordless trimmer that includes premium battery life with zero pull cords.


Gas performance results are guaranteed even though it's battery powered. Weighing almost 22 pounds, this beast will get through all your overgrown yard areas. Two-line spool and Hi-Low speed options are added benefits.


Pricey option.

DEWALT 40V MAX 4.0 Ah Lithium Ion XR String Trimmer
40V MAX 4.0 Ah Lithium Ion XR String Trimmer
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Bottom Line

This cordless grass trimmer is ideal for light to medium trimming.


Low-volume motor and fewer maintenance issues to be concerned with make this trimmer ideal for home use. Includes 40 volt MAX 4 amp hour lithium ion battery and charger. Cutting swath is 15 inches. Comes with a three-year limited warranty and one year of free service.


Some users have had trouble with the trimmer head.

DEWALT 20V Max 23-inch Cordless String Trimmer
20V Max 23-inch Cordless String Trimmer
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Bottom Line

Lightweight, efficient weed eater that makes an ideal purchase for those who already have DEWALT products, including a 20V battery.


Low cost for a tool-only purchase. Lightweight design and 13-inch swath allows for precision and control. Variable speed allows for more power usage in thick, dense areas. Part of a lengthy list of 20V-battery-compatible tools.


Required battery and charger are not included.


We recommend these products based on an intensive research process that's designed to cut through the noise and find the top products in this space. Guided by experts, we spend hours looking into the factors that matter, to bring you these selections.

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Buying guide for best dewalt weed eaters

A well-manicured lawn requires proper effort, planning, and the right tools for a job. Grass, roots, leaves, and flowers need to be tended to regularly so that they’re all growing — or not growing, in some cases — in their respective spaces.

A weed eater is a useful tool that can serve you throughout the season. Also known as a string trimmer, a weed eater eliminates weeds and helps you maintain boundaries throughout your lawn. You can use a weed eater to keep grass off your driveway, path, or sidewalk, as well as to prevent unwanted plants from encroaching on your beds and gardens.

DEWALT is one of the most popular names in home tools and hardware, and the company produces a selection of outdoor equipment, including weed eaters, that cater to most homeowner lifestyles. The products are light, efficient, and trustworthy. Our guide will take you through DEWALT’s weed eater offerings, explain how they differ from competitors, and show you why a DEWALT weed eater could be the best choice for you.

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Register your product online with DEWALT upon purchase. You’ll be able to access the warranty and browse any necessary guides or instructions.

Key considerations

Weed eaters vs. string trimmers

Terminology matters when shopping for lawn care equipment because often, several names exist for the same or similar items. What’s more, not everyone uses the same term for the same thing.

Concerning DEWALT, and indeed most companies, the terms “weed eater” and “string trimmer” are used interchangeably. An alternative to the string trimmer is the bladed trimmer, which offers more power and durability but also requires more power and a higher degree of maintenance and energy to use. Bladed trimmers can also serve as edgers, which are designed to create boundaries. Some weed eaters can do this job, too, though they don’t have the same power or effectiveness on tough jobs.


Weed eaters may be gas-powered, electric, or manual. DEWALT, however, only makes electric weed eaters powered by battery. These are better for the environment and create less air and noise pollution than gas-powered weed eaters. They are lighter, smaller, and easier to store and transport. However, they aren’t ideal for large plots and may struggle with tough, dense weeds.

Notably, you will need to invest in a DEWALT battery and charger. The lithium ion battery can be used across various DEWALT products, provided the charge is the same.


Weed eaters are designed to help maintain boundaries in certain areas of your lawn and garden. However, they are not necessarily designed to manufacture those boundaries. That’s the job of an edger, which can dig several inches into the soil to create a barrier. While some companies offer dual trimmer-edger tools, DEWALT currently does not. That said, there are some hacks you can use, which we touch on elsewhere in this buying guide.

DEWALT’s weed eaters are two-handed pieces of equipment that are best used to cut back weeds and grass from flower beds, sidewalks, and driveways. They are useful in areas where a bulky lawn mower may not be able to reach, such as around mailboxes and under bushes.


Weed eaters trim grass with a nylon string that is housed in a spool at the base of the device. You can toggle how much of the string is exposed in order to adjust how much grass is cut. The nylon string will wear down over time and require a replacement spool. DEWALT offers a Quickload replacement spool designed for fast, easy use. DEWALT spools also extend, or “bump” the feed line as necessary when in use.

Cutting swath

Most DEWALT string trimmers feature a cutting swath of 12 to 15 inches. While that may not seem like a big range, every inch makes a difference when it comes to tending your lawn. Shorter lengths offer a bit more control and precision. Longer lengths may offer more protection and distance from encroaching weeds.


One of the perks of DEWALT weed eaters is portability. Generally, these tools weigh under 10 pounds and are easy to hold and wield with two hands. Keep in mind that bigger jobs will require more energy and creating precision boundaries will call for steady handling of the machine.


While some companies offer a choice of a straight or curved shaft, DEWALT’s weed eaters only feature a straight shaft. Straight shafts generally offer more flexibility on the job and the ability to access hard-to-reach places. Curved shafts generally offer more precision and control, but they may have difficulty accessing hard-to-reach places.



DEWALT offers 60-volt batteries that are backward compatible and can work on devices using 20-volt batteries. This is especially useful if you need a powerful weed eater but own other DEWALT items that only require 20-volt batteries.


DEWALT weed eaters are battery operated, but not all units come with the battery. You may want to purchase a bundle that includes a battery and charger. Buying these items together should be cheaper than buying them separately. That said, you may want to forgo the bundle if you already have a battery and charger for another DEWALT device.

Folding shaft

Select models of DEWALT weed eaters feature a folding shaft. The shaft locks into place when in use without sacrificing durability, but it can also be folded for easy storage and transport.

"Consider the weather when you’re working outside. You may want to wear a hat, sunscreen, and UV-protective clothing. Drink plenty of water to stay hydrated."


Lawn mower: Greenworks 20-Inch Corded Electric Lawn Mower
The first step to creating a beautifully manicured lawn is cutting the grass. We like this environmentally friendly electric lawn mower from Greenworks.

Hedge trimmer: BLACK+DECKER 40V Hedge Trimmer
While string trimmers keep grass and weeds at bay, hedge trimmers maintain the shape and appearance of your bushes. We recommend his battery-powered option from BLACK+DECKER.

Electric tiller: BLACK+DECKER Bare Max Garden Cultivator
For those ready to garden, a tiller and cultivator will help create the proper soil condition for growth. This BLACK+DECKER option is versatile while easy to use and store.

Leaf blower: Worx Corded Electric Leaf Blower
Taking care of your lawn in the fall will lead to a healthy spring season. Clear away leaves with this relatively quiet and lightweight blower from Worx.

DEWALT weed eater prices

Inexpensive: The least-expensive weed eaters from DEWALT start around $100. These tools have smaller cutting swaths and are best for small areas.

Mid-range: For between $100 and $150, you can find DEWALT weed eaters with more power. These tools are suitable for small and medium-size jobs.

Expensive: For $150 and up, you’ll be able to buy bundles or kits that include the DEWALT weed eater as well as a battery, charger, and even additional string spools.


  • Cut the grass before trimming. Your lawn mower is a powerful device that can make trimming easier. Mow grass and weeds first. Then, use the weed eater for a more accurate trim.
  • Assess the weed eater’s direction. The direction your weed eater rotates indicates the trajectory of cut grass and weeds. Keep that in mind when you’re walking so the grass goes where you want it to.
  • Survey the area. Before you begin work, check the area for rocks, pebbles, roots, and other debris. Some items could damage the weed eater, while others could be projected toward you or others.
  • Remember to charge. Get into the habit of charging your battery after use. A powerless battery quickly deters any outdoor maintenance plans. DEWALT weed eater batteries can take one to two hours to fully charge.
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If the soil is soft, you can turn the weed eater on its side and work it as an edger, digging straight down. Hold the device securely and make sure you’re not hitting anything hard or rocky under the surface.


Q. How do I best maintain my weed eater?
After using your weed eater, remove dirt, soil, and other debris from the head so it doesn’t harden and disrupt future use. Store the weed eater in a cool, dry place away from moisture and heat. The battery and charger should be kept in a similar space. Over time, you will need to replace the spool, but otherwise, a DEWALT electric weed eater should require little to no maintenance.

Q. How safe are weed eaters to use?
Like most outdoor tools, weed eaters are relatively safe provided you understand how they work and take proper precautions. Even with a guard on the head, however, they can still fling dirt, pebbles, and other debris. Protect your eyes, hands, wrists, feet, and ankles, as these are the most sensitive or vulnerable areas of the body. Gloves, in particular, can help prevent your hands from getting sore.

As DEWALT weed eaters are battery-powered, you needn’t worry about cords tangling up, but it’s best to keep pets and children away while you’re working.

Q. What are the best ways to prolong battery life?
DEWALT advises you to avoid running the battery down completely. Turn off your device when you notice it weakening. You can leave the battery in the charger indefinitely, as the charger’s maintenance mode prevents damage from occurring. However, you should avoid charging the battery if it is warm or hot. Instead, leave it at room temperature for an hour or so first.

Prior to the off-season, fully charge your DEWALT weed eater battery before storing it. Once the battery is dead, it can be recycled.

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