How to Measure Ring Size at Home

This is the most common home method and works well for most finger shapes.

1. Take a piece of non-stretchy string, dental floss, or thin twine. It should be long enough to wrap comfortably around your finger.
2. Wrap it around the base of the finger you want to size. Pull it snug but not tight — you should be able to slide it over your knuckle without forcing it.
3. Mark where the string overlaps with a pen or pinch the point with your fingers.
4. Lay the string flat against a ruler and measure from the end to your mark in millimetres. This is your finger circumference.
5. Find your circumference in our international size chart to determine your ring size.

Paper is slightly easier to mark and measure than string, and most people have it on hand.

1. Cut a strip of paper approximately 5mm wide and 10cm long. Standard printer paper works well — avoid thick card as it will not conform to your finger shape.
2. Wrap the strip around the widest part of your finger, making sure it sits flat without twisting.
3. Where the strip overlaps, mark both edges with a fine pen.
4. Measure the distance between your marks in millimetres. This is your circumference.
5. Match the measurement to our size chart.

If you have a ring that fits the intended finger well, you can measure it directly. This is particularly useful when sizing for a surprise engagement ring — borrow a ring they already wear on that finger.

1. Place the ring on a flat surface.
2. Measure the internal diameter — the distance across the inside of the ring at its widest point — in millimetres.
3. Find the diameter measurement in the size chart to determine the ring size.

Make sure you measure a ring worn on the same finger and hand. Ring size can differ between fingers and between your dominant and non-dominant hand.

For the most accurate result — especially for engagement rings, wide bands, or if you have large knuckles — professional sizing is recommended. A jeweller uses a set of graduated metal rings (a ring mandrel or sizing set) to find the exact size that slides over your knuckle and sits comfortably at the base.

LILY DIA offers complimentary ring sizing as part of our free consultation. We can also send you a ring sizer if you are ordering remotely.

• Measure in the evening. Fingers swell slightly throughout the day and are at their largest in the evening. A morning measurement may give you a size that feels tight by night.
• Warm hands only. Cold temperatures shrink your fingers temporarily. Make sure your hands are at a normal temperature before measuring.
• Measure multiple times. Take readings on two or three different days. If you get slightly different results, choose the larger size.
• Account for band width. Wider bands (over 4mm) fit tighter than narrow ones. If you are choosing a wide band, go up a half size from your measured size.
• Consider seasonal changes. Fingers are typically larger in summer and smaller in winter. If you are between sizes, factor in the time of year.
• Prominent knuckles. If your knuckle is significantly larger than the base of your finger, measure at the knuckle and at the base, then choose a size in between.