Find your exact ring size at home using a strip of paper or string — no jeweller visit required — then match to international size charts.
Step-by-Step Guide
Gather Your Materials
You need a thin strip of paper (or a piece of string), a pen or marker, a ruler marked in millimetres, and scissors. Make sure the paper strip is no wider than about 1 cm so it sits flat on your finger.
Wrap Around Your Finger
Wrap the strip snugly around the base of the finger you plan to wear the ring on. It should be comfortable — tight enough not to slip, but loose enough to slide over your knuckle. Mark where the strip overlaps.
Measure the Length
Lay the strip flat and measure from the end to your mark in millimetres. This is your finger circumference. For example, 57 mm circumference = EU/ISO size 57 = US size 8.
Account for Knuckle Size
If your knuckle is noticeably wider than the base of your finger, measure both. Size up so the ring passes the knuckle comfortably, then fits snugly at the base. Wide-band rings also tend to fit tighter — go half a size up.
Match to a Size Chart
Use our Ring Size Chart to convert between US, UK, EU, and Japanese sizing systems. Common women's sizes are US 5–7 (circumference 49–54 mm); men's are US 9–11 (59–64 mm). If between sizes, round up.
Try Our Free Tool
Ring Size Chart
Frequently Asked Questions
Q: When is the best time to measure my ring size?
A: Measure at the end of the day when your fingers are at their largest. Fingers swell in heat and shrink in cold, so avoid measuring first thing in the morning or in very cold conditions.
Q: What if the ring I want is wide?
A: Wide bands (over 6 mm) fit tighter than narrow ones because they cover more of the finger. For bands wider than 6 mm, go half a size up from your measured size.
Q: Can I measure a ring I already own?
A: Yes. Measure the internal diameter of the ring in millimetres and multiply by π (3.14159) to get the circumference. Then look up that circumference in a ring size chart.