How to Measure a Partner's Ring Size in Secret for Proposals

Planning a surprise marriage proposal requires measuring your partner's ring size in secret. This requires creativity to ensure the engagement ring fits perfectly on the big day without giving away the surprise.

Creative Secret Methods

The easiest method is to borrow a ring your partner wears on their ring finger and measure its inside diameter. You can also trace the inside of the ring on a piece of paper or press it into a moldable material to record the size.

Alternatively, you can ask a close friend or family member who may know their size, or compare finger sizes playfully to make an estimate.

Sizing and Resizing Planning

If you cannot determine the exact size, we recommend choosing a standard average size (like size 6 for women) and selecting a ring design that is easy to resize later. Resizing down is generally easier than expanding a ring.

Convert your secret measurements using our cm to mm ring size converter. For standard averages, check out our guide on the average ring size for men and women.