Ring Size Measurement

Here's How To Determine Your Ring Size

We get a lot of questions about ring size here at Razzy. Because we sell a lot of our rings online, our customers don’t get a chance to try a ring on before they buy it. That’s why we offer a ring size guide that can help you get the right fit.

Ring Size Chart
    Inside Diameter
    Inside Circumference
    (in)
    (mm)
    (in)
    (mm)
    US Ring Size
    British Ring Size
    Japanese Ring
    Size
    Swiss Ring Size
    0.458
    11.63
    1.44
    36.5
    0
    0.466
    11.84
    1.46
    37.2
    ¼
    0.474
    12.04
    1.49
    37.8
    ½
    A
    0.482
    12.24
    1.51
    38.5
    ¾
    0.49
    12.45
    1.54
    39.1
    1
    B
    1
    0.498
    12.65
    1.56
    39.7
    0.506
    12.85
    1.59
    40.4
    C
    0.5
    0.514
    13.06
    1.61
    41
    1
    0.522
    13.26
    1.64
    41.7
    2
    D
    2
    1.75
    0.53
    13.46
    1.67
    42.3
    2.25
    0.538
    13.67
    1.69
    42.9
    E
    3
    3
    0.546
    13.87
    1.72
    43.6
    3.5
    0.554
    14.07
    1.74
    44.2
    3
    F
    4
    4.25
    0.562
    14.27
    1.77
    44.8
    5
    4.75
    0.57
    14.48
    1.79
    45.5
    G
    5.5
    0.578
    14.68
    1.82
    46.1
    6
    6
    0.586
    14.88
    1.84
    46.8
    4
    H
    7
    6.75
    0.594
    15.09
    1.87
    47.4
    7.5
    0.602
    15.29
    1.89
    48
    I
    8
    8
    0.61
    15.49
    1.92
    48.7
    J
    8.75
    0.618
    15.7
    1.94
    49.3
    5
    9
    9.25
    0.626
    15.9
    1.97
    50
    K
    10
    0.634
    16.1
    1.99
    50.6
    10
    10.5
    0.642
    16.31
    2.02
    51.2
    L
    11.25
    0.65
    16.51
    2.04
    51.9
    6
    11
    11.75
    0.658
    16.71
    2.07
    52.5
    M
    12
    12.5
    0.666
    16.92
    2.09
    53.1
    13
    13.25
    0.674
    17.12
    2.12
    53.8
    N
    13.75
    0.682
    17.32
    2.14
    54.4
    7
    14
    14.5
    0.69
    17.53
    2.17
    55.1
    O
    15
    0.698
    17.73
    2.19
    55.7
    15
    15.75
    0.706
    17.93
    2.22
    56.3
    P
    16.25
    0.714
    18.14
    2.24
    57
    8
    16
    17
    0.722
    18.34
    2.27
    57.6
    Q
    17.5
    0.73
    18.54
    2.29
    58.3
    17
    18.25
    0.738
    18.75
    2.32
    58.9
    R
    19
    0.746
    18.95
    2.34
    59.5
    9
    18
    19.5
    0.754
    19.15
    2.37
    60.2
    S
    20.25
    0.762
    19.35
    2.39
    60.8
    19
    20.75
    0.77
    19.56
    2.42
    61.4
    T
    21.5
    0.778
    19.76
    2.44
    62.1
    10
    20
    22
    0.786
    19.96
    2.47
    62.7
    10¼
    U
    21
    22.75
    0.794
    20.17
    2.49
    63.4
    10½
    22
    23.25
    0.802
    20.37
    2.52
    64
    10¾
    V
    24
    0.81
    20.57
    2.54
    64.6
    11
    23
    24.75
    0.818
    20.78
    2.57
    65.3
    11¼
    W
    25.25
    0.826
    20.98
    2.59
    65.9
    11½
    24
    26
    0.834
    21.18
    2.62
    66.6
    11¾
    X
    26.5
    0.842
    21.39
    2.65
    67.2
    12
    25
    27.25
    0.85
    21.59
    2.67
    67.8
    12¼
    Y
    27.75
    0.858
    21.79
    2.7
    68.5
    12½
    Z
    26
    28.5
    0.866
    22
    2.72
    69.1
    12¾
    29
    0.874
    22.2
    2.75
    69.7
    13
    27
    29.75
    0.882
    22.4
    2.77
    70.4
    13¼
    Z1
    30.5
    0.89
    22.61
    2.8
    71
    13½
    28
    31
    0.898
    22.81
    2.82
    71.7
    13¾
    Z2
    31.75
    0.906
    23.01
    2.85
    72.3
    14
    Z3
    29
    32.25
    0.914
    23.22
    2.87
    72.9
    14¼
    33
    0.922
    23.42
    2.9
    73.6
    14½
    Z4
    30
    33.5
    0.93
    23.62
    2.92
    74.2
    14¾
    34.25
    0.938
    23.83
    2.95
    74.8
    15
    31
    34.75
    0.946
    24.03
    2.97
    75.5
    15¼
    35.5
    0.954
    24.23
    3
    76.1
    15½
    32
    36.25
    0.962
    24.43
    3.02
    76.8
    15¾
    36.75
    0.97
    24.64
    3.05
    77.4
    16
    33
    37.5

    Prepping for Measurement

    Before you begin taking your measurements, pick the finger on which you want to wear your ring. The fingers on your dominant hand tend to be larger than those on your non-dominant hand, so keep that in mind when measuring for your ring size.

    Ensure that your finger is at its normal size before taking a measurement. Cold weather can cause your fingers to shrink a bit, while heat or water retention caused by food, medications, or illness can cause finger swelling.

    To determine your ring size, do the following:

    • Use a piece of string or dental floss and wrap it around the base of your finger.

    • Use a pen to mark the point on the string where the end meets.

    • Use a millimeter ruler to measure the string.

    • Choose the closest measurement to the chart above to find your ring size.

    Tips for best results:

    • Allow enough room to accommodate your knuckle.

    • Bear in mind, different fingers on the same and the opposite hand may have different sizes. Therefore, measure the specific finger on which you are planning to wear the ring.

    • Measure your finger at the end of the day when your finger is likely to be largest.