
Use a physical ring sizer
The most reliable method. Slip it on and choose the size that's snug at the base yet clears the knuckle with slight resistance.
Turn the dial, match a ring you already own, and read your exact US size — with every international conversion.
This is a dial ring sizer — match a ring you own to read your exact size. First, calibrate your screen so it measures true to life.
Hold a bank/ID card upright against the screen and drag the slider until the outline matches it — the long edge is 85.6 mm.
Now you're calibrated — drag the dial, or step the size, to find your fit.

The most reliable method. Slip it on and choose the size that's snug at the base yet clears the knuckle with slight resistance.

Measure the inside diameter in millimeters with digital calipers, then set the dial above — or match it to the size table.

Print our one-page sheet at 100%, then use the true-size circles or the cut-out strip. Grab it in the section just below.

A last resort. Wrap non-stretch string twice around the base, mark where it meets, measure in mm and divide by two for circumference.
No sizer on hand? Print our one-page sheet at home. It includes printable size circles for a ring you own, a cut-out finger strip, and a ruler to verify the scale.

A reusable sizer covering sizes 1–17, half sizes included. It arrives with a coupon toward your ring — and every order ships with one free.
Canada follows US sizing. The UK, Australia & Ireland share the letter system. European sizes are approximate conversions.