String Trimmmer Buying Guide

The first thing to sort out is whether you're buying the machine or the parts that keep it running. Listings in this category cover both, and they look surprisingly similar in search results.

• Weed Eater - The complete trimmer: powerhead, shaft, and cutting head. This is what you want if you're starting from scratch or replacing an old unit.
• Trimmer Line - Bulk spools or pre-cut lengths of cutting line. The single most common repeat purchase, and the cheapest way to improve cutting performance.
• Trimmer Head - The rotating assembly that holds the line. Upgrading to a universal or bump-feed head can fix a trimmer that constantly jams.
• Replacement Spool - Pre-wound cartridges that drop straight into the head. Convenient and nearly foolproof, but more expensive per foot than bulk line.
• Spool Cap - The small plastic cover that holds the spool in place. These crack and fly off regularly, so keeping a spare is smart.
• Trimmer Blade - Metal or plastic blades for brush and woody growth beyond what line can handle. Only fit these to trimmers rated for blade use.
• Combo Kit - A trimmer bundled with a blower, hedge trimmer, or second tool, usually sharing one battery platform. Strong value if you need more than one tool.
• Replacement Parts - Guards, shafts, triggers, carburetors, and assorted hardware for repairs.
• Battery & Charger - Standalone power for cordless tools. Worth buying a second battery if you trim more than a quarter acre at a time.

Read the title carefully before you click buy. A surprising number of returns happen because someone ordered a $15 spool expecting a $150 trimmer.

Power source is the decision that shapes everything else, from weight and noise to how far you can wander from the house. Match it to your yard size and your tolerance for maintenance.

• Cordless Battery - The most popular choice today. No fuel, no cord, instant start, and modern 40V to 80V models rival small gas engines. Runtime is the limit, typically 20 to 45 minutes of real trimming per charge.
• Corded Electric - Unlimited runtime, lightest weight, and the lowest price point. Best for small yards within about 100 feet of an outlet, though dragging an extension cord around shrubs gets old fast.
• Gas 2-Cycle - Light for the power they make and endlessly refuelable, but they need a gas and oil mix, they're loud, and starting them is a ritual. Still the standard for acreage and dense weeds.
• Gas 4-Cycle - Separate gas and oil, so no mixing, plus more torque and less noise than 2-cycle. Heavier and pricier, with oil changes to remember.
• Manual - Hand-powered rotary edgers and grass shears. Niche, quiet, and useful for tiny garden borders only.

For most suburban lots under half an acre, a 40V or higher cordless unit with a spare battery is the sweet spot. Go gas when you're clearing rough ground or working far from power.

Brand matters less for raw performance than for two practical things: which battery platform you're locked into, and how easy it is to find replacement line and heads in three years.

• Black+Decker - Dominates the budget cordless space with light 20V trimmers and auto-feed heads. Ideal for small yards and first-time buyers.
• Ryobi - Enormous 18V and 40V ecosystems with attachment-capable models. Excellent value if you plan to add a blower, edger, or cultivator later.
• Ego - 56V batteries and genuinely gas-comparable power, with premium build quality and a price to match.
• Greenworks - Wide voltage range from 24V to 80V and consistently aggressive pricing. A solid middle-ground cordless brand.
• Stihl - The professional gas benchmark. Straight-shaft FS models are built to be rebuilt, and dealer support is everywhere.
• Husqvarna - Strong gas and battery lineup, especially for larger properties and brush-cutting work.
• Echo - Highly regarded gas trimmers with easy-starting engines and long warranties, popular with homeowners who want pro-grade without pro pricing.
• DeWalt and Milwaukee - Built around the same batteries as their power tools. Compelling if you already own the platform.
• Makita - Quiet, refined battery units, often running dual 18V packs for 36V output.
• Worx - Clever compact designs with pivoting heads and wheeled edge guides, aimed at light residential use.
• Craftsman, Toro, Troy-Bilt, and Poulan Pro - Familiar mainstream names with broad big-box parts availability.
• Oregon and Arnold - Aftermarket specialists for line, heads, and universal replacement parts that fit many brands.

If you already own cordless tools, check the battery mount first. Staying on one platform saves real money and cuts your charger clutter in half.

Voltage is a rough proxy for power on cordless trimmers, while amp-hours determine how long that power lasts. Higher voltage means more torque to push through thick grass without bogging down.

• 12V and 18V - Compact and very light, best for touch-ups along driveways and flower beds. They stall in heavy growth.
• 20V - The most common homeowner class. Plenty for regular weekly trimming on small to mid-size lots and widely cross-compatible with drills and blowers.
• 24V - A modest step up in torque, often found in lightweight two-battery designs.
• 36V and 40V - The practical sweet spot for most yards. Enough power for thick weeds and 0.080 to 0.095 in line, with reasonable weight.
• 48V and 56V - Near-gas performance with fast cutting recovery. Good for a half acre or more of varied growth.
• 60V and 80V - Top-tier battery power that handles brush and tall weeds, often with brushless motors and multi-speed triggers. Heavier and the batteries cost a lot to replace.

Don't fixate on voltage alone. A 40V trimmer with a 4.0Ah battery will outwork an 80V unit with a 2.0Ah pack on any job longer than ten minutes.

Cutting width, also called swath, is the diameter of the circle the line sweeps. Wider swaths finish faster but demand more power and more careful steering near plants.

• Under 10 in - Very precise and light. Suited to tight borders, raised beds, and delicate landscaping.
• 10 in to 12 in - Typical of small 18V and 20V trimmers. Fine for sidewalk edges and small yards.
• 13 in to 14 in - The residential standard. A good balance of speed, control, and battery drain for most properties.
• 15 in to 16 in - Covers ground noticeably faster and is common on 40V and higher cordless plus mid-size gas units.
• 17 in to 18 in - Serious coverage for large lots, usually paired with straight-shaft gas or high-voltage battery trimmers.
• 19 in to 22 in - Commercial-scale swaths for fields and acreage. Heavy and generally overkill for a typical yard.

Pick the widest swath your power source can actually drive. An underpowered trimmer with a wide head just slows down and snaps line.

Shaft design determines your reach, your posture, and whether the tool fits in your trunk. It's an easy spec to overlook and one you'll feel within five minutes of trimming.

• Straight Shaft - Longer reach for getting under decks, fences, and shrubs, and the only style that accepts brush-cutter blades on most models. Preferred by taller users and professionals.
• Curved Shaft - Shorter and better balanced for close-in work around the house. Comfortable and maneuverable, but harder on your back for long sessions and limited on attachments.
• Telescoping Shaft - Adjusts to your height, which matters a lot if multiple people in the household use it. Look for a solid clamp that won't slip under load.
• Split Shaft - Separates in the middle for compact storage and, on attachment-capable models, lets you swap in an edger, pole saw, or cultivator. Great for small sheds and apartment closets.
• Folding Shaft - Hinges for transport and storage on compact battery units. Convenient, though the hinge is one more part that can loosen.

If you're over six feet tall or trim for more than twenty minutes at a stretch, go straight or telescoping. Your lower back will notice the difference.

Line diameter is the single cheapest upgrade or downgrade you can make. Thicker line cuts tougher growth but needs more motor torque, and using the wrong size can damage the head.

• 0.050 in and 0.065 in - Thin, light line for grass and soft weeds on low-voltage and corded trimmers. Breaks easily against concrete and fencing.
• 0.080 in - The all-purpose residential choice. Durable enough for weekly trimming without overloading a mid-size motor.
• 0.095 in - Noticeably tougher, good for thick weeds and heavier use on 40V and up or gas units.
• 0.105 in and 0.130 in - Heavy-duty line for gas trimmers tackling dense brush and woody stems.
• 0.155 in - Commercial-grade line for the largest engines. Most homeowner trimmers cannot spin it.

Always check your manual for the maximum diameter your trimmer accepts. Oversized line overheats motors, jams spools, and voids warranties.

Cross-section shape changes how line cuts, how long it lasts, and how much noise it makes. For the same price, the right shape can transform a mediocre trimmer.

• Round - Most durable and most forgiving against hard surfaces, but it tears grass rather than slicing it. The default for general trimming.
• Twisted - A spiral profile that runs quieter and cuts cleaner than round while staying reasonably tough. A good all-round upgrade.
• Square - Sharp edges slice aggressively through thick weeds. Wears faster and is louder.
• Star - Multiple cutting edges for a very clean cut on grass. Less durable against fences and brick.
• Serrated - Toothed edges that saw through dense, woody growth. Best matched with powerful gas units.
• Multi-Sided - Five, six, or eight-sided profiles balancing cutting edge count with strength. Common in premium line.

Use round line where you're constantly hitting concrete, and switch to square or multi-sided when weeds are winning. Buying bulk line in a couple of shapes is cheap experimentation.

How a trimmer advances fresh line is the difference between a smooth afternoon and repeatedly kneeling in the dirt. This spec generates more frustration than almost any other.

• Auto Feed - The trimmer releases line automatically as it wears. Effortless when it works, though it can waste line and some designs feed unpredictably.
• Bump Feed - Tap the head on the ground to release more line. Reliable, precise, and the professional standard on gas trimmers.
• Push Button Feed - A button on the head advances line on demand without bumping. Common on cordless units and gentle on the head.
• Fixed Line - Pre-cut lengths you insert individually. Simple, no spool to wind, but you reload more often on big jobs.
• Dual Line - Two strands cutting at once for faster, more even results. Uses line quicker and needs more power.

If rewinding spools drives you crazy, look for push button or fixed line systems. For heavy weekly use, bump feed remains the most dependable design.

For gas trimmers, displacement in cubic centimeters signals cutting power and how well the unit resists bogging down. Bigger engines also mean more weight, noise, and fuel.

• Under 25 cc - Light homeowner engines for grass and light weeds. Easy to handle for extended trimming.
• 25 cc to 29 cc - The most popular residential range. Enough power for thick weeds, 0.095 in line, and most attachments.
• 30 cc to 34 cc - Prosumer territory with strong torque for brush cutter blades and large properties.
• 35 cc to 45 cc - Commercial clearing saws for saplings, heavy brush, and all-day use. Heavy enough to require a harness.

For a typical yard, 25 cc to 29 cc is plenty. Step up only if you're regularly cutting brush or working an acre or more.

Weight is the spec that determines whether you finish the job or quit halfway. Remember that listed weights often exclude the battery, which can add two to four pounds.

• Under 6 lb - Very easy to swing one-handed and ideal for quick touch-ups or users with limited strength. Usually lower-powered.
• 6 lb to 9 lb - The comfortable residential range where most quality cordless trimmers land. Manageable for 30 minutes or more.
• 10 lb to 13 lb - Typical of gas units and high-voltage battery models. A shoulder strap becomes genuinely useful here.
• 14 lb to 20 lb - Commercial brush cutters and large-displacement machines. Plan on a full harness.

Balance matters as much as total mass. A well-balanced 9 lb straight shaft often feels lighter in use than a nose-heavy 7 lb unit.

Features separate a tool you tolerate from one you actually enjoy using. A few of these are genuinely worth paying extra for; others are marketing.

• 2-in-1 Trimmer Edger - The head rotates 90 degrees to cut vertical edges along walks and driveways. One of the most useful features for a tidy-looking yard.
• Brush Cutter - Accepts metal blades for saplings and woody stems. Requires a straight shaft and adequate power.
• Attachment Capable - A split shaft that accepts blowers, pole saws, edgers, and cultivators. Excellent long-term value if you buy into one system.
• Pivoting Head - Angles the cutting head for slopes, ditches, and under low shrubs without twisting your wrists.
• Adjustable Handle - Lets you set grip position to your height and reach. A small comfort feature with a big payoff over time.
• Variable Speed - Throttle control to conserve battery on light grass and unleash full power in heavy weeds. Nearly essential on cordless models.
• Shoulder Strap - Transfers weight off your arms. Look for one on anything over 10 lb.
• Wheeled Edge Guide - A small guide wheel that keeps edging lines straight and protects the line from concrete wear.
• Electric Start - Push-button starting on gas units, eliminating the pull-cord routine. A blessing for anyone who has fought a cold engine.
• Battery Included - Check this carefully. Many attractive cordless prices are bare-tool listings with no battery or charger.
• Lightweight - Marketed broadly, so verify the actual number rather than trusting the label.
• Quiet - Brushless battery motors run far quieter than gas, which matters for early mornings and close neighbors.

Prioritize variable speed, an edging function, and a confirmed battery in the box. Those three cover most of what a homeowner will use week to week.