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Here are some steps to determine your own finger size when you do not have access to a jeweler’s finger gauge rings.

  • Wrap a strip of paper, piece of string or small wire around your finger.
  • Mark the string, paper or wire where it overlaps to form a complete circle.
  • Use a ruler to measure the string, paper or wire to determine the circumference (distance around) of your finger in inches or millimeters.
  • Divide the circumference by 3.14 to get the diameter of your finger.
  • Look up the ring size by finding the appropriate circumference or diameter on the Ring Size Conversion Chart below.

Please note: You need to take the knuckle into consideration when sizing. The base of your finger may be smaller then your knuckle. Also wider bands should be sized about one half size larger.

A way to measure a ring you have is to hold it up against a metric ruler that shows millimeters, and carefully measure the inside diameter of the ring shank (part that goes around the finger). A magnifying glass will help to ease the strain on your eyes and help you be more precise in your measuring efforts.

Remember that the hand you use most often will vary in size(s) so be sure to take that into consideration and use the Correct hand for your measurements. For example, if a person is right handed, the finger size on the right hands tends to be a half size bigger than the corresponding finger sizes on the left hand.

Have your finger size measured at the end of the day when your fingers are usually largest. Don’t measure finger sizes when your hands are cold. If possible, have your finger measured several times on different days. This is the best way to get a true reading.

finger-size-gaugeWe also recommend that our Clients have their ring size measured at a jewelers for the most accurate determination. Using finger size gauge rings provides a more accurate finger size measurements and increases the probability the ring will be comfortable to wear.

If the ring is to be a surprise, try to bring one of her rings to any jewelry store and they will have the tools to accurately measure the ring size. Just be sure you are getting a ring she wears on the ring finger of her left hand.

If you only have one of her rings for a few minutes, try making an impression of the ring in something like a bar of soap or a piece of bread. Then you can take that to a jewelry store or use one of the measuring techniques mentioned above.

Perhaps the most common way for getting a quick indicator of the size of her ring is to put the ring on your own finger (probably your smallest finger)and see how far it goes down your finger. Then you can go into a jewelry store to have that part of your finger sized.

When guessing at the finger size, remember that it is better to error on the high side. Nothing is more frustrating for a gal than to be given an ring, especially an engagement ring, that she can not fit on her finger. She wants to show everyone her new ring so waiting to have it re-sized puts a damper on the moment. Even if the ring is a little too big, she can get it on her finger and show everyone her beautiful new ring.

Ring Size Conversion Chart

Inside Inside Inside Inside Sizes
Diameter Diameter Circumference Circumference US/Canada British Japanese Swiss
(inches) (mm) (inches) (mm) Standard Equivalent Equivalent Equivalent
0.458 11.6 1.438 36.5 0
0.466 11.8 1.463 37.2 1/4
0.474 12.0 1.488 37.8 1/2 A
0.482 12.2 1.513 38.4 3/4 A 1/2
0.490 12.4 1.539 39.1 1 B 1
0.498 12.6 1.564 39.7 1 1/4 B 1/2
0.506 12.9 1.589 40.4 1 1/2 C
0.514 13.1 1.614 41.0 1 3/4 C 1/2
0.522 13.3 1.639 41.6 2 D 2 1.50
0.530 13.5 1.664 42.3 2 1/4 D 1/2
0.538 13.7 1.689 42.9 2 1/2 E 3 2.75
0.546 13.9 1.714 43.5 2 3/4 E 1/2
0.554 14.1 1.740 44.2 3 F 4 4.00
0.562 14.3 1.765 44.8 3 1/4 F 1/2 5 5.25
0.570 14.5 1.790 45.5 3 1/2 G
0.578 14.7 1.815 46.1 3 3/4 G 1/2 6 6.50
0.586 14.9 1.840 46.7 4 H 7
0.594 15.1 1.865 47.4 4 1/4 H 1/2 7.75
0.602 15.3 1.890 48.0 4 1/2 I 8
0.610 15.5 1.915 48.7 4 3/4 J 9.00
0.618 15.7 1.941 49.3 5 J 1/2 9
0.626 15.9 1.966 49.9 5 1/4 K 10.00
0.634 16.1 1.991 50.6 5 1/2 K 1/2 10
0.642 16.3 2.016 51.2 5 3/4 L 11.75
0.650 16.5 2.041 51.8 6 L 1/2 11 12.75
0.658 16.7 2.066 52.5 6 1/4 M 12
0.666 16.9 2.091 53.1 6 1/2 M 1/2 13 14.00
0.674 17.1 2.116 53.8 6 3/4 N
0.682 17.3 2.141 54.4 7 N 1/2 14 15.25
0.690 17.5 2.167 55.0 7 1/4 O
0.698 17.7 2.192 55.7 7 1/2 O 1/2 15 16.50
0.706 17.9 2.217 56.3 7 3/4 P
0.714 18.1 2.242 56.9 8 P 1/2 16 17.75
0.722 18.3 2.267 57.6 8 1/4 Q
0.730 18.5 2.292 58.2 8 1/2 Q 1/2 17
0.738 18.7 2.317 58.9 8 3/4 R 19
0.746 18.9 2.342 59.5 9 R 1/2 18
0.754 19.2 2.368 60.1 9 1/4 S 20.25
0.762 19.4 2.393 60.8 9 1/2 S 1/2 19
0.770 19.6 2.418 61.4 9 3/4 T 21.5
0.778 19.8 2.443 62.1 10 T 1/2 20
0.786 20.0 2.468 62.7 10 1/4 U 21
0.794 20.2 2.493 63.3 10 1/2 U 1/2 22 22.75
0.802 20.4 2.518 64.0 10 3/4 V
0.810 20.6 2.543 64.6 11 V 1/2 23
0.818 20.8 2.569 65.2 11 1/4 W 25
0.826 21.0 2.594 65.9 11 1/2 W 1/2 24
0.834 21.2 2.619 66.5 11 3/4 X
0.842 21.4 2.644 67.2 12 X 1/2 25 27.50
0.850 21.6 2.669 67.8 12 1/4 Y
0.858 21.8 2.694 68.4 12 1/2 Z 26 28.75
0.866 22.0 2.719 69.1 12 3/4 Z 1/2
0.874 22.2 2.744 69.7 13 27
0.882 22.4 2.769 70.3 13 1/4 Z1
0.890 22.6 2.795 71.0 13 1/2
0.898 22.8 2.820 71.6 13 3/4 Z2
0.906 23.0 2.845 72.3 14 Z3
0.914 23.2 2.870 72.9 14 1/4
0.922 23.4 2.895 73.5 14 1/2 Z4
0.930 23.6 2.920 74.2 14 3/4
0.938 23.8 2.945 74.8 15
0.946 24.0 2.970 75.4 15 1/4
0.954 24.2 2.996 76.1 15 1/2
0.962 24.4 3.021 76.7 15 3/4
0.970 24.6 3.046 77.4 16