How to choose a string trimmer: cordless, corded or gas
Cutting swath, line thickness, bump vs. auto feed, straight vs. curved shafts, and which power source fits your yard.
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A string trimmer (also called a weed eater or weed whacker) cleans up everything a mower misses. The right one depends on how much yard you have and how thick the growth is.
Power sources
| Type | Best for | Trade-offs |
|---|---|---|
| Cordless (battery) | Most suburban yards | Runtime limited by battery; heavier batteries for more power |
| Corded electric | Small yards near outlets | Cord limits reach and gets in the way |
| Gas | Large properties, thick weeds | Loud, heavier, needs fuel mixing and maintenance |
If you already own battery tools from one brand, a trimmer on the same platform shares batteries and chargers.
Cutting swath
The cutting swath (the width of the circle the line cuts) is typically around 12 to 17 inches. Wider swaths cover ground faster; narrower ones are easier to control around flower beds.
Line diameter
Trimmer line comes in different thicknesses, commonly:
- 0.065 inch: light grass trimming, many cordless trimmers.
- 0.080 inch: general use, slightly tougher weeds.
- 0.095 inch and up: thick weeds and heavy-duty trimming.
Use the diameter your trimmer's manual specifies. Line that's too thick can strain the motor and jam the head.
Feed systems
- Bump feed: tap the head on the ground to release more line. Common and reliable.
- Automatic feed: releases line when needed without bumping. Convenient but can use more line.
- Fixed-line heads: pre-cut pieces of line you insert; quick to reload.
- Easy-reload heads: let you feed line through without taking the head apart. A big time saver.
Shaft type
- Straight shafts reach under shrubs and decks more easily and suit taller users.
- Curved shafts are often lighter and easier to balance for small jobs.
- Split shafts on some models accept attachments such as edgers or pole saws.
Edging
Many trimmers rotate so the head runs vertically for edging along driveways and sidewalks. Some include a guide wheel to keep the line straight.
Comfort and safety
- Weight and balance, with the battery or fuel included.
- Adjustable handle to fit your height.
- Guard that deflects debris; wear eye protection, long pants and closed shoes.
- Variable speed to save battery on light grass.
Questions people ask
Can a string trimmer cut thick weeds?
Light-duty models struggle. For thick weeds, use thicker line and a more powerful trimmer, or switch to a brush cutter blade if the trimmer supports it.
Why does my trimmer line keep breaking?
Common causes include hitting fences and concrete, old brittle line, or the wrong diameter. Soaking old line in water before winding is a common tip to restore flexibility.
Is a cordless trimmer powerful enough?
For most suburban yards, yes. Large properties and heavy growth may call for extra batteries or a higher-voltage model.