Skip to main content
LILY DIA

How to Measure Ring Size at Home

Quick answer

Wrap a non-stretch string or a thin paper strip around the widest part of the finger, mark where it overlaps, then measure that length in millimetres. That number is the inside circumference. Match it to the Australian ring size chart and measure in the evening for the closest everyday fit.

Method 1: String or thread

This is the easiest method if you have no ring to measure, but it needs a material that does not stretch. Dental floss, thin twine or sewing thread works better than elastic string.

  1. Wrap the string around the base of the finger you want to size, close to where the ring will sit.
  2. Pull it snug enough to touch the skin without pressing in, and check that the loop can still move over the knuckle.
  3. Mark the point where the string overlaps with a pen or pinch it firmly.
  4. Lay the string flat against a ruler and measure from the end to the mark in millimetres.
  5. Use that circumference on the international size chart to find the closest ring size.

Method 2: Paper strip

Paper is easier to mark than string and usually gives a cleaner reading. Use thin printer paper rather than card, because thick material changes the fit.

  1. Cut a paper strip about 5mm wide and 10cm long.
  2. Wrap the strip around the widest part of the finger, making sure it sits flat without twisting.
  3. Mark where the paper overlaps with a fine pen.
  4. Measure from the start of the strip to the mark in millimetres.
  5. Compare the measurement with the ring size chart. If the number falls between two sizes, use the fit notes below before choosing.

Method 3: Existing ring

If you have a ring that already fits the intended finger, measure the ring rather than the finger. This is usually the best home method for a surprise engagement ring, provided the borrowed ring is worn on the same finger and hand.

  1. Place the ring on a flat surface.
  2. Measure the internal diameter, which is the straight distance across the inside of the band at its widest point.
  3. Record the number in millimetres.
  4. Find the diameter measurement in the size chart to determine the closest Australian size.

A ring from the other hand can be misleading. Dominant hands are often slightly larger, and every finger has its own size.

Method 4: Professional sizing

Professional sizing is best for engagement rings, wide bands, prominent knuckles or anyone who gets different readings at home. A jeweller checks the finger with graduated sizing rings and can balance knuckle fit against the way the ring sits at the base of the finger.

LILY DIA offers complimentary ring sizing as part of a studio consultation, and we can send a ring sizer if you are ordering remotely.

Tips for accurate measurement

  • Measure in the evening. Fingers usually swell during the day, so a morning size can feel tight later.
  • Warm your hands first. Cold fingers shrink temporarily, which can make the size read too small.
  • Measure more than once. Take readings on two or three days and use the result that repeats most often.
  • Allow for band width. Wider bands feel tighter because they cover more skin, so bands over 3mm often need a half size more.
  • Check the knuckle. If the knuckle is much larger than the base of the finger, choose a size that can pass the knuckle without spinning too much once it is on.
  • Note the hand and finger. A ring that fits the right ring finger may not fit the left ring finger.

Ready to compare

Choose the ring with size in mind

Once you have a measurement, compare engagement rings with a clearer sense of band width, setting height and everyday comfort.

View engagement rings

Frequently asked questions

What is the most accurate way to measure ring size at home?
Measuring an existing ring by inside diameter is usually the most reliable home method, as long as the ring fits the same finger on the same hand. If you do not have a ring to measure, use a paper strip rather than stretchy string.
Should I measure ring size in the morning or evening?
Measure in the evening, when fingers are usually at their largest. Avoid measuring when your hands are cold, straight after exercise or after a salty meal, because finger size can shift temporarily.
What should I do if my measurement is between two sizes?
Choose the larger size if the ring is a wider band, your fingers swell in warm weather or the measurement only just fits over the knuckle. For a narrow engagement ring, the closer size may be more comfortable.
Can I measure a ring size for a surprise proposal?
Yes, but use a ring they already wear on the correct finger if you can. A ring from the other hand or another finger may be one or more sizes away from the engagement ring size.

Still unsure

Send us the measurement you have

If you have a paper measurement, an existing ring diameter or a few photos of the ring on hand, send it through and we will help you narrow down the size.

Contact the studio