Ring Size Chart & Sizing Guide

Size chart

Measure the circumference of your finger in mm (wrap a strip of paper snugly around the base of the finger, mark where it overlaps, then measure that length against a ruler), then match it to the closest size below. When between two sizes, size up — a ring that's slightly loose is more comfortable and safer than one that's slightly tight.

How to measure your ring size at home

• Cut a thin strip of paper (or use a piece of non-stretchy string) about 10 cm long and 5-6 mm wide.
• Wrap it snugly around the base of the finger you'll wear the ring on — snug enough to feel resistance passing over the knuckle, not loose.
• Mark exactly where the strip overlaps itself, then lay it flat and measure that length in mm with a ruler.
• That number is your circumference — match it to the closest row on the chart above, sizing up if you're between two sizes.
• Measure at the end of the day when fingers are at their largest, and avoid measuring right after exercise, in the cold, or first thing in the morning.

Measuring the right finger — and getting the width right

• Measure the specific finger the ring is for — sizes differ noticeably between fingers on the same hand, and between your dominant and non-dominant hand.
• Wider band rings need to be sized slightly larger than a thin band, since more surface area against the finger makes a ring feel tighter at the same actual diameter.
• If the ring is for someone else and you can't measure them directly, borrow a ring they already wear on that finger and measure its inside diameter against a printable ring sizer instead.

Why finger size changes through the day

• Fingers swell in heat and humidity and shrink in cold — a ring that fits perfectly in summer can feel tight in a heated house in winter.
• Sodium intake, alcohol, and time of day (typically largest by evening) all cause short-term swelling that shifts the measurement by a partial size.
• For an engagement ring or a size that needs to be precise, measure on 2-3 different days and average the result rather than relying on a single measurement.

Frequently asked questions