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UK ring size guide
A comfortable fit starts with a little expert guidance. Find your UK size, compare international sizes and discover what to consider before you choose.
Find your ring sizeA little guidance
Your ring size, made clearer.
Use the UK letter size shown on our ring listings. Compare it with inside measurements or an international size using the chart below.
| UK & Australia | Inside diameter (mm) | Inside circumference (mm) | US & Canada |
|---|---|---|---|
| A | 11.95 | 37.54 | ½ |
| A ½ | 12.18 | 38.26 | ¾ |
| B | 12.37 | 38.86 | 1 |
| B ½ | 12.60 | 39.58 | 1 ¼ |
| C | 12.78 | 40.15 | 1 ½ |
| C ½ | 13.00 | 40.84 | 1 ¾ |
| D | 13.21 | 41.50 | 2 |
| D ½ | 13.41 | 42.13 | 2 ¼ |
| E | 13.61 | 42.76 | 2 ½ |
| E ½ | 13.83 | 43.45 | 2 ¾ |
| F | 14.05 | 44.14 | 3 |
| F ½ | 14.15 | 44.45 | 3 1/8 |
| F ¾ | 14.25 | 44.77 | 3 ¼ |
| G | 14.36 | 45.11 | 3 3/8 |
| G ¼ | 14.45 | 45.40 | 3 ½ |
| G ½ | 14.56 | 45.74 | 3 5/8 |
| H | 14.65 | 46.02 | 3 ¾ |
| H ½ | 14.86 | 46.68 | 4 |
| I | 15.04 | 47.25 | 4 ¼ |
| I ½ | 15.27 | 47.97 | 4 ½ |
| J | 15.40 | 48.38 | 4 5/8 |
| J ¼ | 15.53 | 48.79 | 4 ¾ |
| J ½ | 15.70 | 49.32 | 5 |
| K | 15.80 | 49.64 | 5 1/8 |
| K ¼ | 15.90 | 49.95 | 5 ¼ |
| K ½ | 16.00 | 50.27 | 5 3/8 |
| L | 16.10 | 50.58 | 5 ½ |
| L ¼ | 16.30 | 51.21 | 5 ¾ |
| L ½ | 16.41 | 51.55 | 5 7/8 |
| M | 16.51 | 51.87 | 6 |
| M ½ | 16.71 | 52.50 | 6 ¼ |
| N | 16.92 | 53.16 | 6 ½ |
| N ½ | 17.13 | 53.82 | 6 ¾ |
| O | 17.35 | 54.51 | 7 |
| O ½ | 17.45 | 54.82 | 7 ¼ |
| P | 17.75 | 55.76 | 7 ½ |
| P ½ | 17.97 | 56.45 | 7 ¾ |
| Q | 18.19 | 57.15 | 8 |
| Q ½ | 18.35 | 57.65 | 8 ¼ |
| Q ¾ | 18.53 | 58.21 | 8 ½ |
| R | 18.61 | 58.47 | 8 5/8 |
| R ¼ | 18.69 | 58.72 | 8 ¾ |
| R ½ | 18.80 | 59.06 | 8 7/8 |
| R ¾ | 18.89 | 59.34 | 9 |
| S | 19.10 | 60.00 | 9 1/8 |
| S ¼ | 19.22 | 60.38 | 9 ¼ |
| S ½ | 19.31 | 60.66 | 9 3/8 |
| S ¾ | 19.41 | 60.98 | 9 ½ |
| T | 19.51 | 61.29 | 9 5/8 |
| T ¼ | 19.62 | 61.64 | 9 ¾ |
| T ½ | 19.84 | 62.33 | 10 |
| U | 20.02 | 62.89 | 10 ¼ |
| U ½ | 20.20 | 63.46 | 10 ½ |
| V | 20.32 | 63.84 | 10 5/8 |
| V ¼ | 20.44 | 64.21 | 10 ¾ |
| V ½ | 20.68 | 64.97 | 11 |
| W | 20.76 | 65.22 | 11 1/8 |
| W ¼ | 20.85 | 65.50 | 11 ¼ |
| W ½ | 20.94 | 65.78 | 11 3/8 |
| W ¾ | 21.08 | 66.22 | 11 ½ |
| X | 21.18 | 66.54 | 11 5/8 |
| X ¼ | 21.24 | 66.73 | 11 ¾ |
| X ½ | 21.30 | 66.92 | 11 7/8 |
| Y | 21.49 | 67.51 | 12 |
| Y ½ | 21.69 | 68.14 | 12 ¼ |
| Z | 21.89 | 68.77 | 12 ½ |
| Z +½ | 22.10 | 69.43 | 12 ¾ |
| Z+1 | 22.33 | 70.15 | 13 |
| Z+1.5 | 22.60 | 71.00 | 13.5 |
| Z+2 | 22.69 | 71.28 | – |
| Z+2.5 | 22.92 | 72.00 | – |
| Z+3 | 23.06 | 72.45 | – |
| Z+3.5 | 23.24 | 73.01 | – |
| Z+4 | 23.47 | 73.73 | – |
| Z+4.5 | 23.55 | 73.98 | – |
| Z+5 | 23.87 | 74.99 | – |
| Z+6 | 24.27 | 76.25 | – |
Measurements and conversions are approximate. Different charts and ring profiles can vary, so a professional fitting is the best way to confirm your size.
View the full international conversion chart
Includes measurements in millimetres and inches, plus international size conversions. Swipe or scroll across to see every column. A dash means no conversion is listed.
| UK & Australia | Inside diameter (mm) | Inside circumference (mm) | US & Canada | Inside diameter (in) | Inside circumference (in) | French & Russian | German | Japanese | Swiss |
|---|---|---|---|---|---|---|---|---|---|
| – | 9.91 | 31.13 | 0000 | 0.390 | 1.22 | – | – | – | – |
| – | 10.72 | 33.68 | 00 | 0.442 | 1.39 | – | – | – | – |
| – | 11.53 | 36.22 | 0 | 0.454 | 1.43 | – | – | – | – |
| A | 11.95 | 37.54 | ½ | 0.474 | 1.49 | – | – | – | – |
| A ½ | 12.18 | 38.26 | ¾ | 0.482 | 1.51 | – | – | – | – |
| B | 12.37 | 38.86 | 1 | 0.487 | 1.53 | – | – | 1 | – |
| B ½ | 12.60 | 39.58 | 1 ¼ | 0.496 | 1.56 | – | – | – | – |
| C | 12.78 | 40.15 | 1 ½ | 0.503 | 1.58 | – | – | – | – |
| C ½ | 13.00 | 40.84 | 1 ¾ | 0.512 | 1.61 | – | – | – | – |
| D | 13.21 | 41.50 | 2 | 0.520 | 1.63 | 41 ½ | 13 ½ | 2 | 1 ½ |
| D ½ | 13.41 | 42.13 | 2 ¼ | 0.528 | 1.66 | – | – | – | – |
| E | 13.61 | 42.76 | 2 ½ | 0.536 | 1.68 | 42 ¾ | 13 ¾ | 3 | 2 ¾ |
| E ½ | 13.83 | 43.45 | 2 ¾ | 0.544 | 1.71 | – | – | – | – |
| F | 14.05 | 44.14 | 3 | 0.553 | 1.74 | 44 | 14 | 4 | 4 |
| F ½ | 14.15 | 44.45 | 3 1/8 | 0.557 | 1.75 | – | – | – | – |
| F ¾ | 14.25 | 44.77 | 3 ¼ | 0.561 | 1.76 | – | – | – | – |
| G | 14.36 | 45.11 | 3 3/8 | 0.565 | 1.77 | 45 ¼ | – | 5 | 5 ¼ |
| G ¼ | 14.45 | 45.40 | 3 ½ | 0.569 | 1.79 | – | 14 ½ | – | – |
| G ½ | 14.56 | 45.74 | 3 5/8 | 0.573 | 1.80 | – | – | 6 | – |
| H | 14.65 | 46.02 | 3 ¾ | 0.577 | 1.81 | 46 ½ | – | – | 6 ½ |
| H ½ | 14.86 | 46.68 | 4 | 0.585 | 1.84 | – | 15 | 7 | – |
| I | 15.04 | 47.25 | 4 ¼ | 0.592 | 1.86 | 47 ¾ | – | – | 7 ¾ |
| I ½ | 15.27 | 47.97 | 4 ½ | 0.601 | 1.89 | – | 15 ¼ | 8 | – |
| J | 15.40 | 48.38 | 4 5/8 | 0.606 | 1.90 | 49 | 15 ½ | – | 9 |
| J ¼ | 15.53 | 48.79 | 4 ¾ | 0.611 | 1.92 | – | – | – | – |
| J ½ | 15.70 | 49.32 | 5 | 0.618 | 1.94 | – | 15 ¾ | 9 | – |
| K | 15.80 | 49.64 | 5 1/8 | 0.622 | 1.95 | 50 | – | – | 10 |
| K ¼ | 15.90 | 49.95 | 5 ¼ | 0.626 | 1.97 | – | – | – | – |
| K ½ | 16.00 | 50.27 | 5 3/8 | 0.630 | 1.98 | – | – | 10 | – |
| L | 16.10 | 50.58 | 5 ½ | 0.634 | 1.99 | 51 ¾ | 16 | – | 11 ¾ |
| L ¼ | 16.30 | 51.21 | 5 ¾ | 0.642 | 2.02 | – | – | – | – |
| L ½ | 16.41 | 51.55 | 5 7/8 | 0.646 | 2.03 | – | – | – | – |
| M | 16.51 | 51.87 | 6 | 0.650 | 2.04 | 52 ¾ | 16 ½ | 12 | 12 ¾ |
| M ½ | 16.71 | 52.50 | 6 ¼ | 0.658 | 2.07 | – | – | – | – |
| N | 16.92 | 53.16 | 6 ½ | 0.666 | 2.09 | 54 | 17 | 13 | 14 |
| N ½ | 17.13 | 53.82 | 6 ¾ | 0.674 | 2.12 | – | – | – | – |
| O | 17.35 | 54.51 | 7 | 0.683 | 2.15 | 55 ¼ | 17 ¼ | 14 | 15 ¼ |
| O ½ | 17.45 | 54.82 | 7 ¼ | 0.687 | 2.16 | – | – | – | – |
| P | 17.75 | 55.76 | 7 ½ | 0.699 | 2.20 | 56 ½ | 17 ¾ | 15 | 16 ½ |
| P ½ | 17.97 | 56.45 | 7 ¾ | 0.707 | 2.22 | – | – | – | – |
| Q | 18.19 | 57.15 | 8 | 0.716 | 2.25 | 57 ¾ | 18 | 16 | 17 ¾ |
| Q ½ | 18.35 | 57.65 | 8 ¼ | 0.722 | 2.27 | – | – | – | – |
| Q ¾ | 18.53 | 58.21 | 8 ½ | 0.729 | 2.29 | – | 18 ½ | 17 | – |
| R | 18.61 | 58.47 | 8 5/8 | 0.733 | 2.30 | 59 | – | – | 19 |
| R ¼ | 18.69 | 58.72 | 8 ¾ | 0.736 | 2.31 | – | – | – | – |
| R ½ | 18.80 | 59.06 | 8 7/8 | 0.740 | 2.32 | – | – | – | – |
| R ¾ | 18.89 | 59.34 | 9 | 0.748 | 2.35 | – | 19 | 18 | – |
| S | 19.10 | 60.00 | 9 1/8 | 0.752 | 2.36 | 60 ¼ | – | – | 20 ¼ |
| S ¼ | 19.22 | 60.38 | 9 ¼ | 0.757 | 2.38 | – | – | – | – |
| S ½ | 19.31 | 60.66 | 9 3/8 | 0.760 | 2.39 | – | – | – | – |
| S ¾ | 19.41 | 60.98 | 9 ½ | 0.764 | 2.40 | – | 19 ½ | 19 | – |
| T | 19.51 | 61.29 | 9 5/8 | 0.768 | 2.41 | 61 ½ | – | – | 21 ½ |
| T ¼ | 19.62 | 61.64 | 9 ¾ | 0.772 | 2.43 | – | – | – | – |
| T ½ | 19.84 | 62.33 | 10 | 0.781 | 2.45 | – | 20 | 20 | – |
| U | 20.02 | 62.89 | 10 ¼ | 0.788 | 2.48 | 62 ¾ | – | 21 | 22 ¾ |
| U ½ | 20.20 | 63.46 | 10 ½ | 0.797 | 2.50 | – | 20 ¼ | 22 | – |
| V | 20.32 | 63.84 | 10 5/8 | 0.800 | 2.51 | 63 | – | – | 23 ¾ |
| V ¼ | 20.44 | 64.21 | 10 ¾ | 0.805 | 2.53 | – | – | – | – |
| V ½ | 20.68 | 64.97 | 11 | 0.814 | 2.56 | – | 20 ¾ | 23 | – |
| W | 20.76 | 65.22 | 11 1/8 | 0.817 | 2.57 | 65 | – | – | 25 |
| W ¼ | 20.85 | 65.50 | 11 ¼ | 0.821 | 2.58 | – | – | – | – |
| W ½ | 20.94 | 65.78 | 11 3/8 | 0.824 | 2.59 | – | – | – | – |
| W ¾ | 21.08 | 66.22 | 11 ½ | 0.830 | 2.61 | – | 21 | 24 | – |
| X | 21.18 | 66.54 | 11 5/8 | 0.834 | 2.62 | 66 ¼ | – | – | 26 ¼ |
| X ¼ | 21.24 | 66.73 | 11 ¾ | 0.836 | 2.63 | – | – | – | – |
| X ½ | 21.30 | 66.92 | 11 7/8 | 0.839 | 2.64 | – | – | – | – |
| Y | 21.49 | 67.51 | 12 | 0.846 | 2.66 | 67 ½ | 21 ¼ | 25 | 27 ½ |
| Y ½ | 21.69 | 68.14 | 12 ¼ | 0.854 | 2.68 | – | – | – | – |
| Z | 21.89 | 68.77 | 12 ½ | 0.862 | 2.71 | 68 ¾ | 21 ¾ | 26 | 28 ¾ |
| Z +½ | 22.10 | 69.43 | 12 ¾ | 0.870 | 2.73 | – | – | – | – |
| Z+1 | 22.33 | 70.15 | 13 | 0.879 | 2.76 | – | 22 | 27 | – |
| Z+1.5 | 22.60 | 71.00 | 13.5 | 0.890 | 2.80 | – | – | – | – |
| Z+2 | 22.69 | 71.28 | – | 0.893 | 2.81 | – | – | – | – |
| Z+2.5 | 22.92 | 72.00 | – | 0.902 | 2.83 | – | – | – | – |
| Z+3 | 23.06 | 72.45 | – | 0.908 | 2.85 | – | – | – | – |
| Z+3.5 | 23.24 | 73.01 | – | 0.915 | 2.87 | – | – | – | – |
| Z+4 | 23.47 | 73.73 | – | 0.924 | 2.90 | – | – | – | – |
| Z+4.5 | 23.55 | 73.98 | – | 0.927 | 2.91 | – | – | – | – |
| Z+5 | 23.87 | 74.99 | – | 0.940 | 2.95 | – | – | – | – |
| Z+6 | 24.27 | 76.25 | – | 0.956 | 3.00 | – | – | – | – |
Before you choose
Three ways to find your size.
Measure a ring you wear
Choose a round ring that fits the same finger and hand. Measure straight across the inside, from one inner edge to the other, in millimetres. Compare that inside diameter with the chart.
Do not include the metal band in your measurement. A small measuring error can change the suggested size.
Use a physical ring sizer
If you cannot visit, use a physical ring sizer and follow its instructions. Check the fit more than once, and ask us for help if you are between sizes.
Paper, string and on-screen circles are only rough guides and can easily give a misleading result.
The details matter
A comfortable fit is personal.
Allow for your knuckle
The ring should sit comfortably at the base of your finger and pass over the knuckle with a little resistance.
Consider the band width
A wide band can feel snugger than a fine band in the same size. Try a sizer with a similar width where possible.
Measure at a normal temperature
Very hot or cold hands can affect the result. Check at a comfortable temperature and repeat on another occasion.
Use the correct hand and finger
Your hands may differ in size. For a surprise gift, a ring worn on the intended finger is a more useful reference than a general average.
Expert help, before you order
Can your chosen ring be resized?
Resizing depends on the ring’s metal, design, stone setting and condition. Some designs, including certain full eternity rings, may not be suitable.
Where resizing is available online, the product page shows the options and any additional charge. If your required size is not offered, please contact us before ordering so we can check that particular ring.
Resizing or other alterations can affect dispatch time. Let us know if you have a particular date in mind.
Explore repair & restoration
A little more guidance?
Let’s find the right answer together.
Our Mansfield team is here to help with your size, your chosen piece or your order.