Ring Size Chart & Ring Sizer

Yes. A website can’t read your screen’s physical size, so you calibrate it once by matching an outline to any bank card. Then lay a ring that fits on the screen and line the circle up with the inside of the band. The size updates as you adjust, and your phone remembers the calibration for next time.

It depends on how you measure. A ring laid on a calibrated screen is measured directly, so it’s as exact as your calibration and how carefully you line up the circle. A string, a paper strip or a finger on the screen gives an estimate, and we label those sizes “Estimate”. Whichever way you measure, measuring twice is the best check.

Yes, in three ways: lay a ring that fits on your screen (or measure its inside with a ruler), wrap a string or a strip of paper around your finger, or use a soft tape measure. You can also print our ring sizer, at 100% scale, and check it against its 50 mm line.

Measure a ring that already fits: its inside diameter in millimetres is in the ring size chart. With no ring, wrap a non-stretchy string or a strip of paper around the base of your finger, mark where it overlaps and measure the length in millimetres. That’s your finger’s circumference, which the converter turns into a size.

Not always. Fingers on your two hands, and different fingers on one hand, can be different sizes. Measure the finger you’ll wear the ring on, on that hand.

A US size 7 ring is 17.3 mm across the inside and 54.4 mm (2.14 in) around. That’s UK N½ and Europe 54–55.

A ring that measures 20 mm across the inside is US 10¼, UK U–U½ and Europe 63. If 20 mm is a length around your finger, it’s too small for any ring size: measure again in millimetres around the base of the finger.

7 cm is a measurement around the finger (the circumference): 70 mm around is 22.3 mm across, between US 13 and 13¼. That’s UK Z+1 and Europe 70.

No. India uses its own scale: a US 7 ring (17.3 mm across) is about size 14 in India. Indian sizes come from jewelers’ charts rather than a formal standard, so treat a conversion as approximate.

Wrap a soft tape measure around the base of your finger, snug but not tight, and read where it meets in cm. That’s your finger’s circumference: find it in the cm column of the ring size chart, or type it in millimetres (cm × 10) into the converter.

Not one we can honestly give you. We found no published survey that measures fingers where a ring sits. The closest measured data comes from Japan’s National Institute of Advanced Industrial Science and Technology (AIST), which measured the ring finger of Japanese adults around the middle knuckle: the middle half of the 327 men measured 57–61 mm around it, and the middle half of the 203 women 51–54.5 mm. That is one country’s adults, measured at the knuckle a ring must pass over rather than where it sits, so it can’t tell you your size. Measuring your own finger, or a ring that fits, takes a minute with the tools on this page. Source: AIST Japanese hand dimensions data

Wrong size? Send it back within 90 days and we’ll send you the size you need.