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How to measure the ring size without her knowing?

To secretly obtain her ring size, you will have to get creative. You can try asking people who are close to her such as her best friend, her sister or her mom. Only ask them if you know they can keep a secret.

If you want to measure one of her existing rings, make sure she wears it on the correct finger. The ring should have a comparable thickness and should properly fit her as well. Also, remember to put the ring back exactly where you found it.

If you really need to measure her ring finger, you could try to use the paper ring sizer or even a piece of string to measure the circumference of her ring finger while she is sleeping. This is only advisable if you know she is a sound sleeper.

how to measure ring size

Measure an existing ring

Use a calliper or a ruler to measure the inside diameter of the ring. This measurement, expressed in mm. (If you have different measuring system then use the converter chart below)
how to measure ring size

Convert an international ring size

Use our comparative table if you know the ring size in a different country or measuring system than the one Keefirivunts uses.

Download our conversion chart

how to measure ring size

Print a paper ring sizer

You can print, cut and use this paper ring sizer to determine the correct ring size. Make sure you are printing in the correct scale. If the scaling is correct, this method is quite reliable.

The average ring size is 6US/16.5mm

Most women have a ring size between 5US/15.5mm and 7US/17.5mm. A ring should fit your finger comfortably. It needs to be tight enough so that it won’t fall off, but at the same time, loose enough to slide over your knuckle.

When in doubt

It is easier to stretch the ring than to make it smaller. However, if you are planning a surprise proposal, you might rather choose a larger size than a smaller size. This way, you will be able to slide the ring around her finger after you have popped the question.

Adjust afterwards

If the ring size is too large or too small after purchase, most ring designs can be adjusted afterwards. If a size adjustment is not possible or would compromise the quality, a new ring will have to be made in order to guarantee our quality standards. The exact price of a size adjustment depends on the design and the number of sizes the ring needs to be changed.

Consider the ring design

A wider ring needs to be slightly larger to ensure it is not too tight or causes a pinching sensation. Add 1 or more sizes for a comfortable fit. For very wide rings, it is best to contact us personally for expert advice.

Account for the knuckle

The base of your finger is often smaller than your knuckle. Make sure to measure both the base and the knuckle separately and select a size in between those two measurements. This will allow the ring to slide over your knuckle but still fit comfortably around the base of your finger.


Choosing the right ring size is the responsibility of the customer. Keefirivunts OÜ tries to provide ample ways to assist you in assessing the right ring size, but the final choice is always on the customers’s behalf. The perfect ring size is a very personal matter which can only be determined by the person wearing the ring. Therefore, Keefirivunts OÜ can never be held responsible for any incorrect measuring of the client’s ring size.


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