String Trimmer Line: Size, Shape, and the One Worth Buying
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The short answer
For weekly lawn edging, 0.095-inch twisted or round line is the sweet spot. Use 0.065–0.080 only for light grass on small electric trimmers, and 0.105+ square or serrated line only if you're cutting thick weeds with a gas trimmer.
0.095 Twisted Trimmer Line (Bulk Spool)
The sweet spot for weekly edging — quiet, tough, and bulk pricing lasts seasons.
Diameter is the only spec that can't lie
| Line diameter | Best for | Trimmer type | Price |
|---|---|---|---|
| 0.065 in | Light grass, small yards | Cordless under 20V, electric | — |
| 0.080 in | Weekly grass trimming | 20V+ cordless, electric | — |
| 0.095 in | Edging + light weeds | High-volt cordless, homeowner gas | Check Price (opens in a new tab) |
| 0.105–0.130 in | Thick weeds, fence lines | Gas 25cc+ | — |
Check your trimmer's manual before upsizing — a line that's too thick bogs the motor and won't feed through the eyelets. Going one size up from stock is usually safe on gas and 40V+ cordless heads.
Shape changes the cut
- Round: cleanest cut on grass, quietest, cheapest. The default for lawn people.
- Twisted: round's quieter, slightly tougher sibling. Best all-around pick for suburban lawns.
- Square/multi-sided: sharp edges that saw through weeds. Shreds grass tips if you're trimming, not clearing.
- Serrated: aggressive weed line. Overkill — and loud — for edging a lawn.
Buy in bulk, not blister packs
A 3-pound spool of commercial line costs about what four small blister packs do and lasts a homeowner several seasons. Match diameter to your trimmer, pick twisted or round, and you're done. Copolymer 'titanium' and 'reinforced' labels are mostly marketing — diameter and freshness matter more.
Frequently Asked Questions
- What size trimmer line do I need?
- Check the manual or the spool cap — most homeowner cordless trimmers take 0.080 or 0.095. When in doubt, 0.095 twisted fits almost everything above 20V.
- Does expensive trimmer line last longer?
- Slightly, but fresh cheap line beats stale premium line every time. Buy bulk, store it cool and dark, and soak it before loading.
- Can I use a string trimmer to edge my lawn?
- Yes — flip the head vertical and walk the line along the sidewalk. A wheeled edger cuts a cleaner groove, but a trimmer with 0.095 line handles weekly touch-ups fine.
The Gear We’d Buy
Everything referenced in this guide, in one place.
0.095 Twisted Trimmer Line (Bulk Spool)
Top pickThe sweet spot for weekly edging — quiet, tough, and bulk pricing lasts seasons.
Typically $15 - $30
0.080 Round Trimmer Line
The right size for light grass on smaller cordless and electric trimmers.
Typically $8 - $15
0.105 Square Trimmer Line
Serrated edges saw through fence-line weeds — gas trimmers only.
Typically $15 - $25
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Key Takeaways
- 0.095" twisted line covers almost every suburban lawn.
- Match diameter to your trimmer — bigger isn't free.
- Soak line in water 24 hours to stop breakage.
- Bulk spools cost a fraction of blister packs.
Reviewed by
The Lawn Tool Hub Test Bench
We buy, borrow and break lawn tools on our own yards — clay in the back, sand-cut Bermuda in the front — and write down what actually changed the result.
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Top pick
0.095 Twisted Trimmer Line (Bulk Spool)