Method 1: Paper Strip (Most Accurate at Home)

  1. 1

    Cut a thin strip of paper about 10mm wide and 80mm long

    Use a standard piece of paper and scissors. The strip should be narrow enough to simulate a ring width.

  2. 2

    Wrap around the base of your finger

    Wrap the paper snugly around the base of the finger you want to measure (not the middle or tip — rings sit at the base). It should be snug but comfortable — you should be able to slide it off over the knuckle without too much difficulty. Mark where the paper overlaps with a pen.

  3. 3

    Measure the marked length

    Remove the paper and measure in millimetres from the end to your pen mark. This is the circumference of your finger.

  4. 4

    Convert to ring size

    Use the chart below to find your size, or divide circumference by 3.14 to get the inner diameter.

Ring Size Chart (Circumference in mm → Size)

  • 44mm circumference → Size 4 / EU 44 / AU/UK H
  • 47mm → Size 4.5 / EU 47 / AU/UK I–J
  • 49mm → Size 5 / EU 49 / AU/UK K
  • 51mm → Size 6 / EU 51 / AU/UK L–M
  • 54mm → Size 7 / EU 54 / AU/UK N–O
  • 57mm → Size 8 / EU 57 / AU/UK P–Q
  • 60mm → Size 9 / EU 60 / AU/UK R–S
  • 63mm → Size 10 / EU 63 / AU/UK T–U
  • 65mm → Size 10.5 / EU 65 / AU/UK V
  • 68mm → Size 11 / EU 68 / AU/UK W–X

Method 2: Measure an Existing Ring

If you have a ring that fits the correct finger well, place it on a ruler and measure the inner diameter. Compare to the diameter column in ring size charts — the diameter is circumference divided by 3.14.

When to measureFingers change size throughout the day and with temperature. Measure in the evening (fingers are at their largest) and at comfortable room temperature — cold shrinks fingers, heat expands them. If between sizes, go up half a size rather than down — a slightly loose ring is safer and more comfortable than a tight one.

Frequently Asked Questions

Ring sizing is not internationally standardised. US sizes use numbers (6, 7, 8). UK and Australian sizes use letters (L, M, N). European sizes use circumference in millimetres. When ordering internationally, always specify both the circumference in millimetres AND the size in the local system to avoid confusion. Many online stores show all three measurements.
This is common. Measure both the base of the finger and the knuckle. Choose a size that slides over the knuckle — then if the ring is loose at the base, a ring size adjuster (a small silicone or metal clip) holds it in place. Alternatively, jewellers can fit rings with hinged shanks or sizing beads for this situation.