A string trimmer that feels like a toy in your hands but turns into a beast against overgrown fence lines and thick crabgrass is the holy grail of lawn care. The problem is that most lightweight trimmers sacrifice torque, cutting width, or battery endurance to shave off those ounces—leaving you with a tool that bogs down in anything heavier than a dandelion.
I’m Mohammad Maruf — the founder and writer behind Gardening Beyond. I’ve spent the last several seasons comparing motor specs, battery voltages, cutting diameters, and line-feeding mechanisms on cordless and gas trimmers, cross-referencing owner feedback to isolate which sub-12-pound models actually deliver on their promises rather than just their weight claims.
This guide breaks down seven of the most competitive options on the market right now, from ultra-budget battery wackers to pro-grade gas machines, so you can confidently choose the best lightweight string trimmer that matches your yard size and cutting expectations.
How To Choose The Best Lightweight String Trimmer
When you’re shopping for a lightweight string trimmer, the common mistake is to prioritize the lowest number on the scale while ignoring how the weight is distributed, how fast the head spins, and how easily the line feeds. A trimmer that’s 3.5 pounds but nose-heavy will fatigue your arms faster than a 6-pound unit with a balanced center of gravity.
Motor Power vs. Weight Trade-Off
Lightweight trimmers typically use smaller motors. Check the no-load RPM — a trimmer running at 7,000 RPM or higher can handle thick grass and light brush. Anything below 6,000 RPM is best limited to light weekly touch-ups around flower beds. The voltage rating on cordless models (18V, 20V, 40V) is a rough indicator of torque potential, but the brushless motor type is the real efficiency driver.
Cutting Width and Line Diameter
A 12-inch cutting head is standard for lightweight trimmers and works well for edging and tight spaces. If you’re clearing larger areas, a 15-inch or 18-inch head saves time but adds weight. Line diameter matters too — 0.065-inch line is fine for grass, while 0.080-inch or thicker handles heavier weeds without constant line breakage.
Battery System and Runtime
Cordless trimmers rely on battery chemistry. A 2.0Ah battery at 20V typically delivers 20-30 minutes of continuous runtime. Look for kits that include two batteries so you can swap and keep working. Also verify whether the battery platform is shared with other tools from the same brand — this multiplies the value of your investment.
Feed Mechanism
Auto-feed systems that advance line every time you trigger the motor are convenient but can jam or overfeed. Bump-feed heads are more reliable but require a manual tap on the ground. Push-button command feed systems offer a middle ground — you decide when to advance the line without tapping.
Quick Comparison
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| Model | Category | Best For | Key Spec | Amazon |
|---|---|---|---|---|
| WORX WG163 | Mid-Range Cordless | Versatile trimming and edging | 5.5 lbs / 12″ cut / 7,600 RPM | Amazon |
| BLACK+DECKER LSTE525 | Mid-Range Cordless | Two-speed power management | 12″ cut / 2-speed control | Amazon |
| Greenworks 40V 15″ | Premium Cordless | Larger lawns needing 40V power | 15″ cut / 40V / 2.0Ah battery | Amazon |
| Makita XRU23Z | Premium Tool-Only | Existing Makita battery owners | 13″ cut / 6,000 RPM brushless | Amazon |
| Husqvarna 130L | Premium Gas | Heavy-duty gas performance | 18″ cut / 28cc / 8,000 RPM | Amazon |
| Ryobi One+ P2010 | Entry Cordless | Ryobi platform compatibility | 18V / 10″ cut | Amazon |
| GOODJOB 20V | Budget Cordless | Ultra-light trimming under 4 lbs | 3.5 lbs / 12″ cut / 9,500 RPM | Amazon |
In‑Depth Reviews
1. WORX WG163 Cordless String Trimmer & Edger
The WORX WG163 hits the sweet spot where weight, power, and versatility converge. At 5.5 pounds with batteries installed, it’s light enough for an hour of edging without shoulder strain, yet the 20V Power Share platform delivers a consistent 7,600 RPM that chews through St. Augustine and bahia grass with ease. The 12-inch cutting path is ideal for suburban lot sizes, and the push-button Command Feed spool system eliminates the frustration of bump-feed heads that stop working mid-job.
What really sets this trimmer apart is the 90-degree tilting head and the included support wheels. When you flip the head to edging mode, the rubberized wheels guide the line along sidewalks and driveways, producing razor-straight edges without gouging the turf. The flower guard spacer is another smart touch — it prevents accidental damage to landscape beds and ornamentals. Two 20V Power Share batteries are included, and they interchange with the entire WORX 20V and 40V tool ecosystem.
The only real compromise is the 0.065-inch line diameter, which is standard for this class but will snap more frequently against woody weeds. If your property has blackberry vines or saplings, you’ll want a heavier-duty unit. For the vast majority of homeowners maintaining a clean, manicured lawn, this is the most well-rounded option available.
What works
- Push-button command feed is instant and reliable
- Converts to edger with guide wheels in seconds
- Lightweight balance reduces arm fatigue
What doesn’t
- 0.065-inch line struggles with thick brush
- Battery runtime drops noticeably in thick grass at full trigger
2. BLACK+DECKER LSTE525 20V MAX Cordless String Trimmer
BLACK+DECKER’s LSTE525 brings a genuinely useful feature to the lightweight category: a two-speed trigger that lets you dial back power for light grass trimming or ramp it up for thicker growth. The 20V MAX motor and 12-inch cutting head handle routine weekly maintenance well, and the included two-battery kit means you can hot-swap for continuous work. The overall design prioritizes simplicity — there’s no tilting head or conversion mechanism, just a straightforward trimmer with an edging button on the motor housing.
Assembly is tool-free and takes under two minutes. The telescoping shaft adjusts to accommodate different user heights, which is rare at this price point. The automatic feed spool advances line without bumping, though some users report occasional over-feeding that wastes line. The line itself is the standard 0.065-inch diameter, adequate for grass but prone to fraying against concrete edges.
The LSTE525 is best suited for homeowners who want a simple, reliable trimmer for small to medium lawns and aren’t interested in expensive battery ecosystems. The 20V MAX platform is shared across dozens of BLACK+DECKER yard tools, making this a smart starting point if you’re building a cordless kit. It’s not the lightest option at roughly 6 pounds with battery, but the balanced weight distribution makes it feel lighter than the scale suggests.
What works
- Two-speed trigger offers useful power control
- Telescoping shaft fits different user heights
- Dual batteries provide solid runtime
What doesn’t
- Auto-feed can overfeed and waste line
- No pivoting head for edging on slopes
3. Greenworks 40V 15″ Cordless String Trimmer
Stepping up to 40V changes the game for lightweight trimmers. The Greenworks 40V model delivers noticeably more torque than any 20V competitor, spinning a 15-inch cutting path that covers ground faster without bogging down. The 2.0Ah battery provides about 30 minutes of runtime, and the 40V platform is shared with Greenworks chainsaws, blowers, and hedge trimmers — making it a strong investment if you’re building a cordless outdoor power tool set. The tool weight lands around 7.5 pounds with battery, which is slightly heavier than the pure ultra-light crowd but still manageable for most users.
The cutting head uses a bump-feed system, which is dependable but requires a firm tap on the ground to advance line. The included 0.080-inch line is thicker than the 0.065-inch standard on budget trimmers, reducing breakage and improving cutting efficiency against heavier weeds. The shaft is adjustable in length, and the handle rotates for comfort during edging. One limitation is that the head doesn’t pivot — you rotate the entire shaft to edge, which takes some getting used to.
This trimmer is ideal for homeowners with quarter-acre to half-acre lots who want the speed of a wider cutting path without graduating to a gas machine. The 40V power is particularly noticeable when you hit a patch of wire grass or nimblewill — the motor maintains RPM rather than stalling. If your yard is smaller than a quarter acre, the extra power may go unused, and the bump-feed will feel clunky compared to push-button alternatives.
What works
- 40V motor handles thick grass without stalling
- 15-inch cutting width reduces trim time
- 0.080-inch line lasts longer than standard
What doesn’t
- No pivoting head for edging
- Bump-feed can be inconsistent on first tap
4. Makita XRU23Z 18V LXT Brushless String Trimmer
The Makita XRU23Z is a tool-only trimmer designed for users already invested in Makita’s 18V LXT battery platform. The brushless motor is the highlight here — it operates at up to 6,000 RPM with excellent energy efficiency, and the variable speed trigger gives you precise control over cutting speed. The High/Low power mode switch lets you extend runtime on lighter tasks or maximize torque for thicker growth. With an 18V 4.0Ah battery (sold separately), you can expect up to an hour of continuous trimming.
The cutting width is advertised at 13 inches, but the actual swath depends on line length. The head accepts standard 0.065-inch to 0.080-inch line, giving you flexibility based on vegetation density. The shaft is straight, which improves reach under shrubs and around obstacles compared to curved-shaft designs. At 9.23 pounds with battery, this is the heaviest “lightweight” on the list, but the brushless motor’s torque makes it feel powerful rather than cumbersome.
This trimmer is not for someone buying their first cordless tool — the cost of adding batteries and a charger pushes the total investment well beyond ready-to-run kits. It’s a logical upgrade for Makita 18V LXT owners who want a trimmer that matches the performance of their drills and impacts. The build quality is unmistakable: metal drive housing, rubberized grip, and a robust guard that doesn’t flex under pressure.
What works
- Brushless motor delivers efficient, consistent power
- Variable speed trigger gives fine control
- High/Low mode optimizes battery life
What doesn’t
- Tool-only — batteries and charger sold separately
- Heavier than dedicated lightweight designs
5. Husqvarna 130L Gas String Trimmer
Gas trimmers occupy a different weight class, but at 12.2 pounds the Husqvarna 130L is remarkably light for a 28cc machine with an 18-inch cutting swath. The 2-cycle engine spins at 8,000 RPM, delivering the kind of sustained torque that cordless trimmers can only approximate. The Rapid Replace trimmer head is a clever design — align, load, and twist to reload line in seconds without tools or disassembly. The Smart Start and Air Purge systems mean you rarely fight with the pull cord.
LowVib technology makes a real difference here. The anti-vibration system isolates the handle from the engine, reducing hand numbness during extended trimming sessions. The auto-return stop switch automatically resets to the “on” position, so you don’t accidentally flood the carburetor by forgetting to flip the switch before pulling. The straight shaft provides excellent reach under decks and over retaining walls.
The trade-offs are real: you need to mix 50:1 gas and oil, the 2-cycle engine produces exhaust and noise, and the carburetor requires seasonal maintenance if you store the trimmer. This is absolutely not the right choice for someone with a postage-stamp lawn who wants grab-and-go simplicity. But for properties with acreage, steep slopes, or heavy weed pressure, the 130L is the only tool on this list that will never leave you waiting for a battery to recharge.
What works
- 18-inch cutting width clears large areas fast
- 8,000 RPM engine powers through thick brush
- Rapid Replace head for quick line reloading
What doesn’t
- Requires gas/oil mixing and seasonal maintenance
- Noise and emissions higher than cordless models
6. Ryobi One+ 18V Cordless String Trimmer
The Ryobi One+ 18V trimmer is a classic entry-level cordless option that lives and dies by its ecosystem. The tool itself is straightforward — an 18V motor with a 10-inch cutting width and a bump-feed head that uses 0.065-inch line. It’s not going to win any power awards, but for light trimming around flower beds, sidewalks, and fence lines, it gets the job done. The real draw is that the battery works with over 280 Ryobi One+ tools, making this an extremely low-cost add-on for existing Ryobi owners.
At roughly 6 pounds with battery, the weight is manageable, though the 10-inch cutting path means you’ll make more passes than with wider trimmers. The shaft is curved, which helps with balance but reduces reach under low-hanging shrubs. The bump-feed is reliable once you learn the right tapping force, but it can be finicky on the first few uses until the line breaks in.
This trimmer is best viewed as a budget-friendly companion tool rather than a primary yard machine. If you already own Ryobi One+ batteries from a drill or blower, the cost of entry is essentially just the bare tool price. For new buyers, the limited cutting width and modest power mean you’ll outgrow it quickly if your yard is larger than a small suburban lot. It’s a perfectly fine trimmer for the price, but the WORX or BLACK+DECKER options offer more capability for a small premium.
What works
- Batteries compatible with huge Ryobi One+ ecosystem
- Light and easy to maneuver
- Very low cost for existing Ryobi owners
What doesn’t
- 10-inch cutting width feels narrow
- Motor bogs down in thick or tall grass
7. GOODJOB 20V 12″ Cordless Weed Wacker
The GOODJOB 20V trimmer is the lightest model in this lineup at 3.5 pounds bare tool, and its 9,500 RPM motor is the highest speed rating among all seven trimmers tested. That combination makes it feel snappy and responsive during trimming, and the 12-inch cutting path is generous for a trimmer at this weight. The 180-degree pivoting head converts from trimmer to edger without any tools, and the 3-piece metal shaft breaks down for compact storage. The kit includes two 2.0Ah batteries and six replacement spools, which is exceptional value at the entry-level price point.
The auto-feed system advances line every time you pull the trigger. This is convenient because you never have to think about bumping or button-pressing, but it can also feed more line than needed if you frequently start and stop. The included 0.065-inch line is standard for the class. The head accepts standard spools, so replacements are easy to find. The ergonomic handle is adjustable, though the adjustment mechanism feels a bit plasticky compared to metal-collar designs.
This trimmer is best for homeowners with small lawns who prioritize featherlight weight and compact storage above all else. The 20V motor handles light grass well but will struggle against heavy weeds or overgrown fence lines. The battery runtime is about 30 minutes per pack, which is typical for 2.0Ah batteries. If you need something for quick touch-ups between mows and you don’t want to wrestle with a heavier machine, this is a very compelling budget option.
What works
- Ultra-light 3.5 lbs minimizes arm fatigue
- High RPM motor cuts cleanly through grass
- Comes with two batteries and six spools
What doesn’t
- Auto-feed can overfeed line on frequent start/stop
- Not powerful enough for heavy brush or tall weeds
Hardware & Specs Guide
Motor Type: Brushed vs. Brushless
Brushless motors are more efficient, produce less heat, and deliver longer runtime per charge than brushed motors. All else equal, a brushless trimmer like the Makita XRU23Z will outperform a brushed competitor at the same voltage. The trade-off is higher cost — you typically pay a premium for brushless technology.
Battery Voltage and Amp-Hour Ratings
Voltage (18V, 20V, 40V) determines the motor’s potential torque, while amp-hour (Ah) determines runtime. A 2.0Ah battery at 20V provides roughly 40 watt-hours of energy. A 40V 2.0Ah battery provides 80 watt-hours — double the energy. Higher voltage trimmers can spin wider, thicker line without stalling, but the batteries are heavier and more expensive.
Cutting Line Diameter
0.065-inch line is the standard for lightweight trimmers and works well for grass. 0.080-inch line is thicker, resists breakage, and handles mixed weeds. Some trimmers are limited to 0.065-inch by the spool design. Always check the compatible line diameter before buying replacement spools — using the wrong size can jam the feed mechanism.
Shaft Type: Straight vs. Curved
Straight shafts transmit power more efficiently and provide better reach under shrubs and around obstacles. Curved shafts lower the center of gravity, making the trimmer feel better balanced in hand, but reduce reach. Most lightweight trimmers use curved shafts to enhance the perception of lightness.
FAQ
What is the ideal weight for a lightweight string trimmer?
Can a lightweight cordless trimmer replace a gas trimmer?
Is a higher RPM always better in a string trimmer?
How long do lightweight trimmer batteries last?
What is the best cutting width for a lightweight trimmer?
Final Thoughts: The Verdict
For most gardeners, the best lightweight string trimmer winner is the WORX WG163 because it combines a balanced 5.5-pound weight with a 12-inch cutting path, instant-start command feed, and genuine edging capability at a mid-range price. If you want 40V power and a wider 15-inch cutting swath for larger lawns, grab the Greenworks 40V. And for heavy-duty gas performance with an 18-inch cutting width that never needs a battery recharge, nothing beats the Husqvarna 130L.