Ring Size Conversion Chart
RING SIZE CONVERSION CHART:
| INSIDE DIAMETER (INCHES) |
INSIDE DIAMETER (MM) |
INSIDE CIRC. (INCHES) |
INSIDE CIRC. (MM) |
NUMERICAL SIZES (US, CANADA, ASIA) |
ALPHABETICAL SIZES (AUSTRALIA, UK, ETC) |
|---|---|---|---|---|---|
| 0.458" | 11.6 mm | 1.438" | 36.5 mm | 0 | |
| 0.466" | 11.8 mm | 1.463" | 37.2 mm | 1/4 | |
| 0.474" | 12 mm | 1.488" | 37.8 mm | 1/2 | A |
| 0.482" | 12.2 mm | 1.513" | 38.4 mm | 3/4 | A 1/2 |
| 0.49" | 12.4 mm | 1.539" | 39.1 mm | 1 | B |
| 0.498" | 12.6 mm | 1.564" | 39.7 mm | 1 1/4 | B 1/2 |
| 0.506" | 12.9 mm | 1.589" | 40.4 mm | 1 1/2 | C |
| 0.514" | 13.1 mm | 1.614" | 41 mm | 1 3/4 | C 1/2 |
| 0.522" | 13.3 mm | 1.639" | 41.6 mm | 2 | D |
| 0.53" | 13.5 mm | 1.664" | 42.3 mm | 2 1/4 | D 1/2 |
| 0.538" | 13.7 mm | 1.689" | 42.9 mm | 2 1/2 | E |
| 0.546" | 13.9 mm | 1.714" | 43.5 mm | 2 3/4 | E 1/2 |
| 0.554" | 14.1 mm | 1.74" | 44.2 mm | 3 | F |
| 0.562" | 14.3 mm | 1.765" | 44.8 mm | 3 1/4 | F 1/2 |
| 0.57" | 14.5 mm | 1.79" | 45.5 mm | 3 1/2 | G |
| 0.578" | 14.7 mm | 1.815" | 46.1 mm | 3 3/4 | G 1/2 |
| 0.586" | 14.9 mm | 1.84" | 46.7 mm | 4 | H |
| 0.594" | 15.1 mm | 1.865" | 47.4 mm | 4 1/4 | H 1/2 |
| 0.602" | 15.3 mm | 1.89" | 48 mm | 4 1/2 | I |
| 0.61" | 15.5 mm | 1.915" | 48.7 mm | 4 3/4 | J |
| 0.618" | 15.7 mm | 1.941" | 49.3 mm | 5 | J 1/2 |
| 0.626" | 15.9 mm | 1.966" | 49.9 mm | 5 1/4 | K |
| 0.634" | 16.1 mm | 1.991" | 50.6 mm | 5 1/2 | K 1/2 |
| 0.642" | 16.3 mm | 2.016" | 51.2 mm | 5 3/4 | L |
| 0.65" | 16.5 mm | 2.041" | 51.8 mm | 6 | L 1/2 |
| 0.658" | 16.7 mm | 2.066" | 52.5 mm | 6 1/4 | M |
| 0.666" | 16.9 mm | 2.091" | 53.1 mm | 6 1/2 | M 1/2 |
| 0.674" | 17.1 mm | 2.116" | 53.8 mm | 6 3/4 | N |
| 0.682" | 17.3 mm | 2.141" | 54.4 mm | 7 | N 1/2 |
| 0.69" | 17.5 mm | 2.167" | 55 mm | 7 1/4 | O |
| 0.698" | 17.7 mm | 2.192" | 55.7 mm | 7 1/2 | O 1/2 |
| 0.706" | 17.9 mm | 2.217" | 56.3 mm | 7 3/4 | P |
| 0.714" | 18.1 mm | 2.242" | 56.9 mm | 8 | P 1/2 |
| 0.722" | 18.3 mm | 2.267" | 57.6 mm | 8 1/4 | Q |
| 0.73" | 18.5 mm | 2.292" | 58.2 mm | 8 1/2 | Q 1/2 |
| 0.738" | 18.7 mm | 2.317" | 58.9 mm | 8 3/4 | R |
| 0.746" | 18.9 mm | 2.342" | 59.5 mm | 9 | R 1/2 |
| 0.754" | 19.2 mm | 2.368" | 60.1 mm | 9 1/4 | S |
| 0.762" | 19.4 mm | 2.393" | 60.8 mm | 9 1/2 | S 1/2 |
| 0.77" | 19.6 mm | 2.418" | 61.4 mm | 9 3/4 | T |
| 0.778" | 19.8 mm | 2.443" | 62.1 mm | 10 | T 1/2 |
| 0.786" | 20 mm | 2.468" | 62.7 mm | 10 1/4 | U |
| 0.794" | 20.2 mm | 2.493" | 63.3 mm | 10 1/2 | U 1/2 |
| 0.802" | 20.4 mm | 2.518" | 64 mm | 10 3/4 | V |
| 0.81" | 20.6 mm | 2.543" | 64.6 mm | 11 | V 1/2 |
| 0.818" | 20.8 mm | 2.569" | 65.2 mm | 11 1/4 | W |
| 0.826" | 21 mm | 2.594" | 65.9 mm | 11 1/2 | W 1/2 |
| 0.834" | 21.2 mm | 2.619" | 66.5 mm | 11 3/4 | X |
| 0.842" | 21.4 mm | 2.644" | 67.2 mm | 12 | X 1/2 |
| 0.85" | 21.6 mm | 2.669" | 67.8 mm | 12 1/4 | Y |
| 0.858" | 21.8 mm | 2.694" | 68.4 mm | 12 1/2 | Z |
| 0.866" | 22 mm | 2.719" | 69.1 mm | 12 3/4 | Z 1/2 |
| 0.874" | 22.2 mm | 2.744" | 69.7 mm | 13 | |
| 0.882" | 22.4 mm | 2.769" | 70.3 mm | 13 1/4 | Z1 |
| 0.89" | 22.6 mm | 2.795" | 71 mm | 13 1/2 | |
| 0.898" | 22.8 mm | 2.82" | 71.6 mm | 13 3/4 | Z2 |
| 0.906" | 23 mm | 2.845" | 72.3 mm | 14 | Z3 |
| 0.914" | 23.2 mm | 2.87" | 72.9 mm | 14 1/4 | |
| 0.922" | 23.4 mm | 2.895" | 73.5 mm | 14 1/2 | Z4 |
| 0.93" | 23.6 mm | 2.92" | 74.2 mm | 14 3/4 | |
| 0.938" | 23.8 mm | 2.945" | 74.8 mm | 15 | |
| 0.946" | 24 mm | 2.97" | 75.4 mm | 15 1/4 | |
| 0.954" | 24.2 mm | 2.996" | 76.1 mm | 15 1/2 | |
| 0.962" | 24.4 mm | 3.021" | 76.7 mm | 15 3/4 | |
| 0.97" | 24.6 mm | 3.046" | 77.4 mm | 16 |
