How to Measure Your Ring Size at Home: Five Ways to Check

Choose a ring that fits the finger you want to measure. Measure its inside diameter, or measure around its inside edge to find the circumference.

Lay the ring on the on-screen sizer or on a printed circle sheet. Match the inside edge to a circle, not the outside edge. Then read the result in the size chart.

Wrap a narrow strip of paper around the finger where the ring will sit. Mark where the ends meet, then measure the length between the mark and the end in millimetres. That length is the finger’s circumference.

You can use string instead, but choose string that does not stretch. A stretchy string can give a longer measurement than your finger needs. Use the size chart to convert the circumference to a ring size.

Print the printable sizer at 100 percent. Do not choose “fit to page,” because that can change the scale.

Check the printed box against a bank card. The box should match the card, 85.6 x 53.98 mm. The sheet also has a 100 mm ruler: the print is right only if a card fits the box and the ruler measures 100 mm.

Match the outline on the on-screen sizer to a bank card first. If you pinch to zoom or change browser zoom, the scale changes, so calibrate it again before comparing a ring.

This is the least precise of the four methods. When done carefully, it is within about half a US size.

A jeweller’s sizer is the most reliable way to check your size.

It is the best check before an expensive purchase. Ask the jeweller to measure the finger that will wear the ring.

Measure more than once, on different days. Fingers can be larger when warm and smaller when cold. The ring must also pass over the knuckle.

A wide band feels tighter than a narrow band. If you are between two sizes, ask which size the jeweller recommends for that band.