Trimmer Line Sizes Chart

Your weed trimmer head’s string can have a significant impact on your weekly yard maintenance. If you are trimming thick weeds around woody shrubs, the string trimmer line continuously breaks or sticks inside the spool housing. You’ll need to stop and reload.

It makes it worse if you have happened to use thinner weedeater line sizes than you should; thus, you can see why they break easily when trying to cut overgrown vegetation. The proper string trimmer lines for a specific trimmer will last a long time. You can even use these to cut weeds and hit hard surfaces in the process.

The trimmer line materials can often shrug this off before you need to reload the trimmer head. When it comes to replacing the spool, you need the right size string trimmer line.

Trimmer Line Sizes

In our guide, you can learn more about line thickness for your trimmer in our guide. By the end, you’ll see lines needed for light commercial work, the types of trimmer line you can get, and more. (Find the Best Yard Trimmer)

By the end, you’ll quickly see how a trimmer line chart comes in handy.

How Do I Know What Size Trimmer Line I Need?

Before you search for the diameter size of trimmer line, it is good to know the distinct types of line you can get.

Each of these serves a different purpose and can last a different amount of time.

Round Trimmer Line

The standard round trimmer line is designed to regularly be used in the home. Although, therefore, a round trimmer line’s standard, the fundamental shape is that it does not wear out as soon as other trimmer lines.

The spherical string line is less likely to break and is more resistant to concrete, trees, and other obstacles. This is also the line in your trimmer that is the simplest to replace.

Rounded line lasts longer than other weed eater string kinds and is more likely to endure contact with concrete, metals, and other hard things while in use.

This form of standard round line lasts a lot longer when used for small tasks, and it’s also the cheapest and easiest to replace.

Multi-sided Trimmer Line

Professional landscapers will appreciate the multi-sided trimmer line designed to attach to
the end of high-wheel trimmers.

The ribbed form makes cutting through weeds and large grassy areas easier. Multiple-sided lines are better suited to a commercial operation requiring a large volume of cutting.

These lines tend to stay “sharper” for longer, allowing for a much cleaner first cut.

The multi-sided trimmer lines are ideal if you have a larger yard with thicker weeds, woody plants, and shrubs or commercially use the trimmer.

Large regions of woody shrubs and heavy weeds are doomed.

Square Trimmer Line

A square line may appear strange, yet they are just the thing to deal with heavy weeds. The Square trimmer line’s edges allow it to slice through grass and tough weeds easily. This line is ideal for professionals who are constantly dealing with dense weeds.

The commercial square string trimmer lines have been constructed to prevent the outer layers from fusing. As a result, you can knock this string trimmer line against rocks and trees as quickly as if you were doing light work of grass and weeds.

Square trimmer lines come with a high-strength inner core and a weld-resistant outer layer for long-lasting performance.

The string trimmer line offers improved rigidity for heavy cutting and impact strength. You can also find many are color-coded for the diameter size of the square trimmer line. (Read Curved Vs Straight Trimmer)

Twisted Trimmer Line

A spiral-shaped string trimmer line is recommended in commercial areas or where there are noise restrictions.

This twisted string trimmer line is ideal to tackle dense weeds. In addition, a twisted trimmer line is an appropriate choice for you if you use your trimmer for commercial use.

Twisted lines increase strength, efficiency, and noise reduction.

This line is a step up from the round style line, and it provides greater resilience when hitting concrete or other hard surfaces. This trimmer line can also reduce trimmer vibrations and noise levels while providing a clean, even cut.

Serrated Trimmer Line

With teeth-like serrated edges, this line quickly saws through tougher grass blades while leaving a cleaner trim.

The serrated edge trimmer line is suitable for commercial and residential properties with weeds. For thicker weeds and larger areas, serrated trimmer lines are employed.

This serrated line can quickly saw through grass and dense foliage, leaving a cleaner trim as if you were cutting with a kitchen knife.

Use this trimmer line for jobs requiring extra cutting power. A serrated trimmer line may quickly cut through weeds, reducing trimming time, and is the ultimate weed eater string.

What Is The Largest Trimmer Line?

Best Trimmer Line Size Chart 
Line SizesBest Use Scenario
1.65 to 2.03 mm or 0.065 to 0.080 inchesTrimmer lines with a diameter of 0.065 to 0.080 inches are ideal for trimming young, soft grass and weeds. They're also good for trimming small projects around the house and weeding roads and walkways.
2.03 to 2.8 mm or 0.080 to 0.110 inchesThis size of trimmer is ideal for medium-sized applications. They're the finest solution for homes with large front or back lawns, as well as gardens with thick-stemmed weeds. These lines could also be used in a light commercial setting.
0.110 inch (2.8 mm) and higherThese trimmer lines are ideal for large locations that require a lot of trimming as well as commercial applications.

Large yards and gardens, such as those seen on large estates or even golf courses, are examples. They're also best suited to heavy commercial use or lawns with tough grass and woody shrubs.

Strimmer Spools Sizes

Are All Strimmer Spools The Same Size?

You need to buy a strimmer line based on the amount of cutting required. Using a thin cord for heavy-duty work can hamper your productivity because the line will keep breaking.

Many people don’t recognize the difference between light, medium, and heavy growth, so trial and error are involved. We recommend starting with thin cords if the cord snaps quickly before moving up.

Cord size and strength should also depend on the type of grass or weeds you need to cut down. For example, a thin trimming wire will only break or become tangled quickly if you have tough weeds and sturdy long grass. (Find the Best Walk Behind String Trimmer)

Strimmer Wire For Light Duty Work

You can choose a strimmer cord ranging from 1.2mm to 1.4mm in size for light-duty. This will handle the load for a reasonable amount of time without breaking. They’re suitable for trimming light grass as well as some lawn edges.

This cord will wear down quickly if you use it against a concrete surface or brick wall while trimming corners, so it’s a good idea to be a little careful. There are several light-duty cords in assorted colors and shapes to choose from.

Strimmer Wire For Medium Duty Work

Medium duty gauge ranges from 1.5mm to 2mm in thickness. It is suitable for heavier grass and weeds. So, if your light-duty strimmer cord fails or snaps during work, this might be a good option.

This robust cord also won’t wear down as quickly if you trim against hard surfaces like brick walls or concrete pathways, making this line more durable. Medium duty cords are available in different shapes and colors.

Strimmer Wire For Large Yards and More

It’s a good idea to invest in a high-duty strimmer, such as those made by Stihl trimmers, and a larger diameter strimmer line that resists breakage if you’re tackling heavy weeds, thick grass, nettles, and other similar stuff.

The assignment should be accomplished using sizes ranging from 2.4mm to 3mm.

This size line is tough and capable of carrying a lot of weight, making it an excellent choice for heavy residential use.

If the cord still breaks or becomes brittle, a high-speed commercial-grade strimmer cord with a diameter of 3.3mm to 4mm may be required.

These can carry a lot of weight and assist cut down thick grass and weeds on a regular basis. They’re also useful against thick thistles or brambles, which can easily break thinner strands.

Check your user manual if you are unsure of the sizes you can use. Most trimmers accept any thickness, although a thicker line for heavier weeds will fill the spool quicker as you wind the spool.

What Size Is Green Trimmer Line?

As well as the size, it’s important to know what materials the strimmer line is made from. Here you can see the more common materials lines, which are nylon, and titanium string trimmer lines.

However, the trimmer line color code of the green trimmer line can come in up to 200-foot packages and is .080-inch in diameter.


Trimmer lines made of nylon are extremely common. They’re reinforced composite nylon that performs effectively in almost any weed-cutting circumstance.

Even small-sized trimmer lines of this reinforced nylon and other strengthening materials are all the weed-trimming lines you need.

This, along with the proper shape and line diameter, results in an excellent weed-cutting line.

Titanium Trimmer Line

Titanium is a second line that will offer more cutting power. Titanium weed eater lines are efficient and heavy duty to cope with everything from trimming grass and lighter weeds all the way to thick grass where you would need a thicker line to get the same results with a standard basic shape round line.

Titanium string trimmer lines are the future of string trimmer lines. They accelerate faster, your weed eater consumes less fuel and makes less noise and wind resistance.

The trimmer lines cleanly slice through thick grass with their sharp edges. However, you need to pay more for the pleasure of such a heavy-duty line.

Trimmer Line Sizes Chart

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