Crochet Hook Conversion Chart

Crochet hooks come in a wide variety of sizes. Hook sizes are measured by diameter in millimeters and may easily be converted to US standard hook sizes.

    
        US Crochet Hook Size
        Metric/Millimeter (mm)
    
        B/1
        2.25
    
        C/2
        2.75
    
        D/3
        3.25
    
        E/4
        3.5
    
        F/5
        3.75
    
        G/6
        4.0
    
        7
        4.5
    
        H/8
        5.0
    
        I/9
        5.5
    
        J/10
        6.0
    
        K/10.5
        6.5
    
        L/11
        8.0
    
        M/13
        9.0
    
        N/15
        10.0
    
        P
        15.0
    
        Q
        16.0
    
        S
        19.0