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Greenworks 40V 12" String Trimmer

Ranked #13 of 14 in Best Cordless String Trimmers: Greenworks & Ryobi Compared (2026). Here is every spec we scored, where it came from, and how it compares.

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#13

Greenworks 40V 12" String Trimmer

Best for: 12 in 40V trimmer with 33 min runtime

2.0/10

What we like

    Watch out for

    • Lowest cutting swath in this comparison (12 in)

    Score breakdown

    Cutting swath 25%
    Runtime 25%
    Kit battery energy 20%
    Listed weight 20%
    Brushless motor 10%
    Cutting swath12 in
    Runtime33 min
    Kit battery energy80 Wh
    Listed weight7.3 lb
    Brushless motorNo
    Kit battery40 V 2 Ah = 80 Wh (computed)
    PriceCheck price
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    Specs source:

    Greenworks 40V 12" String Trimmer head-to-head

    Head-to-headGreenworks 40V 12" String Trimmer vs Greenworks 24V 12" String Trimmer/Edger

    How it compares

    Open the full comparison table

    Greenworks 40V 17" String Trimmer, 8.0 Ah Kit
    8.3/10
    #1 · Longest runtime here: 80 min on an 8 Ah battery
    Ryobi 40V HP Brushless 17" String Trimmer Kit
    6.9/10
    #2 · Adjustable 15–17 in swath and a 6 Ah battery
    Greenworks 80V 16" Brushless String Trimmer
    6.8/10
    #3 · 65 min runtime from a 2 Ah 80V battery
    Greenworks 80V 16" Brushless Carbon Fiber String Trimmer
    6.7/10
    #4 · Carbon fiber shaft at 7.7 lb
    Greenworks 60V 17" Brushless String Trimmer
    6.6/10
    #5 · 17 in brushless at 7.3 lb
    Greenworks 24V 15" Brushless String Trimmer, 6.0 Ah Kit
    6.4/10
    #6 · Light 15 in brushless at 6.06 lb with 60 min runtime
    Greenworks 80V 17" Brushless String Trimmer
    5.8/10
    #7 · 17 in 80V brushless trimmer
    Greenworks 60V 16" Gen 2 Brushless String Trimmer
    5.1/10
    #8 · 60V brushless with 53 min runtime
    Greenworks 24V 13" Brushless String Trimmer/Edger
    4.8/10
    #9 · 13 in trimmer/edger at 5.51 lb
    Ryobi 18V ONE+ HP Brushless 15" String Trimmer Kit
    3.7/10
    #10 · 18V ONE+ brushless with a 13–15 in swath
    Ryobi 18V ONE+ 13" String Trimmer/Edger Kit
    3.5/10
    #11 · Budget 18V trimmer/edger, 55 min runtime
    Greenworks 40V 15" Gen 2 String Trimmer
    3.4/10
    #12 · 13/15 in swath on the 40V platform
    Greenworks 24V 12" String Trimmer/Edger
    1.7/10
    #14 · Lightest-duty option for small yards