Best 40V String Trimmers: Top 9 Picks (October 2026)
The best 40V string trimmers include the Greenworks 40V 12-Inch Trimmer for routine lawn edges, the WORX WG183 40V 13-Inch Trimmer for lighter handling, and the Ryobi 40V Attachment-Capable Trimmer Kit for tool attachments.
On this page (4 sections)
The Greenworks 40V 12-Inch Trimmer is the best 40V string trimmer for routine lawn edges, with automatic line feed and variable speed control. Choose WORX for a lighter listed weight, Ryobi for attachment capability or SKIL for a wider brushless option.
A 40V label is only one part of the choice. Cutting width, line feed, battery kit and tool weight can matter just as much for the grass and edges you maintain.
If you're deciding between voltage classes first, read our 40V vs 20V trimmer comparison. For other battery-powered options, see our best cordless weed eaters for home lawns and straight-shaft string trimmer picks.
Our picks at a glance
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1
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2
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3
Best for tool attachmentsRyobi 40V Attachment-Capable Trimmer Kit
8.1/10 our score
See it on Amazon
- 4
Check itBLACK+DECKER 40V MAX Far Reach Trimmer and Edger
Best for trimming and edging - 5
Check itSKIL PWR CORE 40 Brushless 14-Inch Trimmer Kit
Best for two speed choices - 6
Check itGreenworks 40V 16-Inch Attachment-Capable Trimmer
Best for a wide cutting path - 7
Check itBLACK+DECKER 40V MAX LST136 Trimmer and Edger
Best for a complete edging kit - 8
Check itGreenworks 40V 15-Inch Trimmer
Best for bump-feed control - 9
Check itBLACK+DECKER 40V MAX 13-Inch Trimmer and Edger
Best for battery charge checks
How we chose these 40V string trimmers
We compared cutting paths, line-feed systems, included batteries, handling details and attachment options. Our score weighs specs and features against what you're shopping for, with a higher score going to a stronger fit for common 40V trimming needs.
A 12 in head can suit careful work around beds and sidewalks, while wider paths cover more ground per pass. Automatic-feed and bump-feed heads work differently, so the best fit depends on whether you prefer continuous line advancement or releasing line with a tap.
We also looked at what comes in the kit. Some picks include a battery and charger, while the BLACK+DECKER Far Reach version is sold without either, which changes what you need to have on hand.
| Product | Best for | Cutting width | Line | Battery | Our score |
|---|---|---|---|---|---|
| Greenworks 40V 12-Inch Trimmer | routine lawn edges | 12 in | 0.065 in dual line | 2.0 Ah battery and charger included | 8.2 |
| WORX WG183 40V 13-Inch Trimmer | lighter handling | 13 in | Two 20V 2.0 Ah batteries and charger included | 8.1 | |
| Ryobi 40V Attachment-Capable Trimmer Kit | tool attachments | 13–15 in adjustable | 4.0 Ah battery and 90-minute charger included | 8.1 | |
| BLACK+DECKER 40V MAX Far Reach Trimmer and Edger | trimming and edging | 13 in | Not included | 8.0 | |
| SKIL PWR CORE 40 Brushless 14-Inch Trimmer Kit | two speed choices | 14 in | 2.0 Ah battery and 60W charger included | 7.9 | |
| Greenworks 40V 16-Inch Attachment-Capable Trimmer | a wide cutting path | 16 in | 0.095 in dual line | 4.0 Ah battery included | 7.8 |
| BLACK+DECKER 40V MAX LST136 Trimmer and Edger | a complete edging kit | 13 in | 2.0 Ah battery and charger included | 7.6 | |
| Greenworks 40V 15-Inch Trimmer | bump-feed control | 15 in | 0.085 in dual line | 2.0 Ah battery and charger included | 7.5 |
| BLACK+DECKER 40V MAX 13-Inch Trimmer and Edger | battery charge checks | 13 in | Included | 7.4 |
Best 40V string trimmers by yard and task
These 40V trimmers suit different priorities, from routine edging to a wide cutting path or an attachment-ready powerhead. Compare the specific features below with the work you do most often.
Greenworks 40V 12-Inch Trimmer: Best for routine lawn edges
- 12 in cutting path
- 0.065 in dual line
- Automatic line feed
- Variable speed trigger
A compact cutting path, automatic line feed and variable speed suit regular trimming around sidewalks and landscaping. The kit includes a battery and charger.
Pros
- Automatic line feed
- Variable speed control
- Battery and charger included
Cons
- Narrowest cutting path in this roundup
- No attachment capability specified
The Greenworks 12 in trimmer is a sensible fit for routine trimming around lawns, sidewalks and landscaping. Its 0.065 in dual line and automatic feed are aimed at steady work without bumping the head.
Variable speed gives you a way to adjust power for edging or extra cutting needs. The kit includes a 2.0 Ah battery and charger, so it is ready to use without a separate battery purchase.
The 12 in cutting path is narrower than the other listed models here. That can help when you want a smaller sweep around beds, though it may mean more passes across open ground.
Choose it for regular lawn maintenance and controlled edging. If you want to cover more area per pass, consider a model with a 14 or 15 in path.
WORX WG183 40V 13-Inch Trimmer: Best for lighter handling
- 13 in cutting width
- Dual-exit cutting head
- Automatic-feed spool
- Two 20V 2.0 Ah batteries
The 6.4 lb listed weight and automatic-feed spool make it a lighter-handling option. Its included batteries work with WORX 20V and 40V tools.
Pros
- Lightest listed weight here
- Automatic line feed
- Two batteries and charger included
Cons
- No variable speed control specified
- Not attachment-capable
The WORX WG183 pairs a 13 in cutting width with a listed weight of 6.4 lb, the lightest figure among these picks. Its automatic-feed spool and dual-exit head are aimed at easier line advancement and cutting efficiency.
The kit includes two 20V 2.0 Ah batteries and a dual charger. WORX Power Share batteries are compatible with its 20V and 40V tools, outdoor power and lifestyle products.
This trimmer does not specify variable speed or attachment support among its features. It suits buyers who value a lighter listed weight and already use, or may add, compatible WORX tools.
Choose it for maneuverability and a shared WORX battery setup. For a powerhead that accepts yard attachments, the Ryobi or Greenworks 16 in pick is a closer fit.
Ryobi 40V Attachment-Capable Trimmer Kit: Best for tool attachments
- Accepts Expand-It and other universal gas attachments
- 13–15 in adjustable cutting width
- Variable speed trigger
- Battery and charger included
Its attachment connection can suit a yard where one powerhead needs to handle more than trimming. The adjustable cutting width lets you choose a narrower path or a wider swath.
Pros
- Attachment-capable
- Adjustable cutting width
- Variable speed trigger
Cons
- Listed weight is 13.9 lb
- Uses bump-feed line advancement
The Ryobi 40V trimmer is the pick for buyers who want an attachment-capable powerhead. It accepts Ryobi Expand-It attachments and other universal gas attachments, which can reduce the need to store separate powered tools.
Its cutting width adjusts from 13 to 15 in. Use the narrower setting for a smaller path or the wider setting to trim a broader area, with the variable speed trigger providing cutting control.
A 4.0 Ah battery and 90-minute charger are included. The REEL-EASY head uses bump feed, and the listed weight is 13.9 lb, so consider both the line system and handling before choosing it.
Choose it if you may use compatible attachments beyond trimming. For automatic line feed in a trimmer and edger, look at the BLACK+DECKER models.
BLACK+DECKER 40V MAX Far Reach Trimmer and Edger: Best for trimming and edging
- 13 in cutting width
- Converts to an edger
- Automatic-feed spool
- Power adjustment dial
A quick conversion between trimming and edging suits buyers who want both jobs in one tool. Add a compatible 40V MAX battery and charger, which are sold separately.
Pros
- Trimmer converts to edger
- Power adjustment dial
- Automatic line feed
Cons
- Battery and charger not included
- No listed weight
The BLACK+DECKER Far Reach trimmer makes sense if you want one tool for trimming and edging. It converts between the two jobs, and the automatic-feed spool advances line without bumping.
Its power adjustment dial lets you select maximum strength for thick growth or aim for extended battery life on larger areas. The 13 in cutting width gives it a middle-of-the-pack path.
This version is a bare tool: the compatible 40V MAX battery and charger are sold separately. Check that you already have a compatible battery or include one in your setup before choosing it.
Choose it if you want edging conversion and already own a compatible battery. If you need a complete kit, the BLACK+DECKER LST136 or LST140C includes a battery and charger.
SKIL PWR CORE 40 Brushless 14-Inch Trimmer Kit: Best for two speed choices
- 14 in cutting swath
- Brushless motor
- Two-speed selection
- Twist-load head
The two-speed selector helps you choose between power and runtime, while the twist-load head is designed for straightforward line loading. This kit includes a battery and charger.
Pros
- Brushless motor
- Twist-load line head
- Battery and charger included
Cons
- Uses bump-feed line advancement
- Listed weight is 6.15 kg
The SKIL PWR CORE 40 kit suits buyers who want a brushless motor and selectable speeds. Its two-speed selector lets you choose between maximizing power or runtime, and the 14 in cutting swath is wider than the 12 and 13 in options.
The twist-load head is designed to make line loading straightforward: insert the line and twist. During trimming, its dual-line bump feed releases more line when you tap the head on the ground.
The kit includes a 2.0 Ah battery and 60W charger. Its listed weight is 6.15 kg, so compare that figure with your comfort and how long you expect to work in one session.
Choose it for a wider brushless trimmer kit with two speed settings. For attachment options, Greenworks and Ryobi have more direct support.
Greenworks 40V 16-Inch Attachment-Capable Trimmer: Best for a wide cutting path
- 16 in cutting width
- Brushless motor
- Compatible with Greenworks attachments
- Two speed modes
The 16 in path covers more ground per pass than the narrower picks, and the powerhead accepts several Greenworks attachments. Its wider head and 15.2 lb listed weight are worth considering for longer sessions.
Pros
- Widest cutting path here
- Attachment-capable
- Brushless motor
Cons
- Listed weight is 15.2 lb
- No charger inclusion specified
The Greenworks 16 in model has the widest cutting path in this roundup and accepts several Greenworks attachments, including an edger, hedge trimmer, pole saw, cultivator and blower. Its brushless motor and two speed modes add more choices for yard tasks.
The trimmer uses 0.095 in dual line and includes a 4.0 Ah battery. The listed weight is 15.2 lb, so the wide path and attachment capability come with a heavier tool to manage.
Greenworks says its 40V platform works with more than 60 outdoor products. That can be useful if you already own compatible tools, but confirm that the specific attachments you want are available for your powerhead.
Choose it for a wide path and compatible Greenworks attachments. If lighter handling matters more, consider the WORX WG183 or the narrower Greenworks model at the top.
BLACK+DECKER 40V MAX LST136 Trimmer and Edger: Best for a complete edging kit
- 13 in cutting width
- Converts to an edger
- Automatic-feed spool
- Battery and fast charger included
This kit pairs a 13 in cutting path with quick conversion to edging, automatic line feed and an included battery and charger. Its power dial lets you choose maximum power or longer runtime.
Pros
- Battery and charger included
- Converts to edger
- Power adjustment dial
Cons
- Listed weight is 7.8 lb
- No attachment capability specified
The BLACK+DECKER LST136 is a complete trimmer and edger kit with a 13 in cutting width, battery and fast charger. It converts to edging in seconds and uses an automatic feed spool, so it avoids bumping to advance line.
Its PowerCommand dial lets you choose maximum power for thick weeds or maximum runtime for longer areas. The included 2.0 Ah battery and charger make it a more complete setup than the bare-tool Far Reach model.
This trimmer's listed weight is 7.8 lb. If you want to check battery charge while working, the tool also includes a state-of-charge indicator.
Choose it for an included battery, charger and edging conversion. If you want a charge indicator in a different BLACK+DECKER 40V kit, compare the LST140C below.
Greenworks 40V 15-Inch Trimmer: Best for bump-feed control
- 15 in cutting path
- 0.085 in dual line
- Bump-feed head
- Variable speed trigger
A 15 in path and variable speed give this trimmer room to cover wider areas, while its bump-feed head advances line when tapped. The kit includes a battery and charger.
Pros
- 15 in cutting path
- Variable speed trigger
- Battery and charger included
Cons
- Bump-feed requires tapping the head
- No attachment capability specified
The Greenworks 40V 15 in trimmer offers a wider cutting path with variable speed. It uses 0.085 in dual line and a bump-feed head, giving it a different line setup from the automatic-feed Greenworks 12 in option.
The kit includes a 2.0 Ah battery and charger. A variable speed trigger helps you adjust cutting speed as you work around plants and shrubs, while the bump-feed system releases line when tapped.
This is a straightforward choice if you want a wider path and prefer bump-feed control. Check the replacement line requirements before buying, especially if you are switching from a trimmer that uses automatic feed.
Choose it for a 15 in path and a bump-feed head. For a similar brand option with automatic feed, compare the 16 in Greenworks or the 12 in model.
BLACK+DECKER 40V MAX 13-Inch Trimmer and Edger: Best for battery charge checks
- 13 in cutting width
- Converts to edger
- Automatic line feeding
- Battery charge indicator
The battery charge indicator helps you check remaining power, and the head converts from trimming to edging. Automatic line feeding avoids bumping the head to advance line.
Pros
- Battery charge indicator
- Trimmer converts to edger
- Automatic line feeding
Cons
- No battery capacity specified
- No listed weight
The BLACK+DECKER LST140C is a trimmer and edger kit with a battery charge indicator. Its 13 in cutting path, quick edging conversion and automatic line feeding make it a practical fit for routine lawn edges.
The included battery has a charge indicator, and the charging base can be mounted on a wall. The product details do not specify the battery capacity, so check that before buying if runtime is a key part of your decision.
The LST140C is a separate model from the LST136. Compare their included battery details, controls and listed weight before choosing between the two.
Choose it if you want to see battery charge and switch between trimming and edging. For a specified 2.0 Ah battery and fast charger, the LST136 is the clearer kit match.
How to choose a 40V trimmer for your yard
Choose a 40V trimmer by matching its cutting path, line system and battery setup to the work you do. If you are weighing voltage before model features, our string trimmer buying guide covers power, weight and line.
What cutting width fits your yard?
A 12 or 13 in path can suit detailed work around beds, posts and sidewalks. A 14 to 16 in path covers more ground per pass, but a wider head may feel less precise in tight spaces.
Which line feed is easier to use?
Automatic feed advances line during operation, while bump feed releases line when you tap the head on the ground. If line breaks or wears often, see our guide to why trimmer string keeps breaking for common causes and handling tips.
Do you need a battery and charger in the box?
A kit with both can be convenient if you are starting a battery platform. A bare tool can make sense when you already own a compatible battery, but check compatibility and charger needs before you buy.
Should you choose an attachment-capable model?
Attachment capability is useful if you plan to use compatible tools such as an edger, hedge trimmer or cultivator. Confirm the specific connection and attachment compatibility for your model, since brands and platforms differ.
Which 40V string trimmer should you choose?
Choose the Greenworks 40V 12-Inch Trimmer for routine edges and automatic line feed. Pick WORX if lighter listed weight matters, Ryobi or Greenworks 16 in if you want attachment options, and the BLACK+DECKER LST136 if you need a complete trimmer and edger kit.
For a broader look at battery-powered models, compare our best cordless weed eaters for home lawns. If you already have Greenworks tools, our EGO vs Greenworks string trimmer comparison can help you weigh those two battery platforms.
Our top 3 picks at a glance
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1
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2
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3
Best for tool attachments
Ryobi 40V Attachment-Capable Trimmer Kit
8.1/10 our score
See it on Amazon
Frequently asked questions
What is the best 40V string trimmer for most yards?
The Greenworks 40V 12-Inch Trimmer is a practical pick for routine lawn edges because it combines automatic line feed with variable speed control. If you want a wider cutting path, compare the 14 in SKIL or 15 in Greenworks models, then consider the extra weight and line-feed style.
Is a 40V string trimmer more powerful than a 20V model?
Voltage alone doesn't tell you how a trimmer will perform in your yard. Cutting width, line type, motor, battery and task all matter.
Compare the models in our 40V vs 20V trimmer guide to decide whether a 40V tool fits your grass and workload.
Should I choose automatic-feed or bump-feed line?
Automatic-feed systems advance line during operation, while a bump-feed head releases line when you tap it on the ground. Choose the style that feels easier to manage and check the replacement spool or line requirements before buying.
For line sizing, see our guide to choosing string trimmer line.
Are 40V trimmers suitable for thick weeds?
Some 40V trimmers include features aimed at heavier growth, such as a wider path, thicker dual line, brushless motor or selectable speed. Those details don't make every model right for dense brush, so match the head and line to your yard.
For tougher growth, compare the picks in our heavy-brush weed wacker guide.
