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Discreet guide to finding the right engagement ring size

What is your future wife's ring size? To buy the perfect engagement ring, you must measure the ring size. This doesn't have to be too difficult and you don’t have to worry about where to get the ring sized – you could even get it sized at home. With the help of one of her current rings, you can easily find out her ring size. You can use an app or order the BAUNAT ring sizer. But there are also other ways to determine ring size. In this article, the experts at BAUNAT share all the tips you need to buy an engagement ring in the right ring size.

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How can you secretly discover the perfect engagement ring size?

Finding your partner's ring size without spoiling the surprise requires creativity and subtlety. The easiest method is using a ring she already wears regularly. Simply measure its inner diameter with a ruler, then compare it to a sizing chart to determine the correct size. Alternatively, you can use smartphone ring sizing apps or bring her ring to a jeweler for professional measurement.

If she doesn't have existing rings, consider asking her friends, observing objects she wraps around her fingers, or creating playful situations with toy rings. Remember that fingers are typically larger in the evening and can be affected by factors like salt intake and exercise. The average women's engagement ring size ranges between 16-17.8mm in diameter.

When in doubt, slightly larger is better than too small, as BAUNAT can help with resizing after purchase if needed.

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Finding the right engagement ring size based on an existing one

Selecting an engagement ring can be an intricate dance of creativity and subtlety, especially if you wish to preserve an element of surprise. For those fortunate enough to have access to rings your significant other currently wears, these trinkets become invaluable allies in your quest for perfection.

By ingeniously utilising a current favourite, you can discern the ideal size that seamlessly wraps around her finger, ensuring every detail of your romantic proposal reflects effortlessness and elegance.

Measuring a ring she currently wears

Does your partner have a ring that she often wears and that you know fits her perfectly? Then there are various ways that you can subtly ascertain her ring size. Place the ring on a ruler and read the inner diameter (not the outside!) and do this very precisely, to the millimeter. Then use a comparative size table to determine the right ring size in your country.

Does your partner have a ring that she often wears and that you know fits her perfectly? Then there are various ways that you can subtly ascertain her ring size. Place the ring on a ruler and read the inner diameter (not the outside!) and do this very precisely, to the millimetre. Then use a comparative size table to determine the right ring size in your country.

Download our engagement ring size chart



Use the table below of average ring sizes for women to see which diameter corresponds to BAUNAT's sizes. Or download the full chart for an overview of all circumferences.
 
BAUNAT België maat Binnenomtrek in mm
47 15,0
48 15,3
49 15,6
50 16,0
51 16,3
52 16,6
53 17,0
54 17,2
55 17,5
56 17,8
57 18,1
58 18,4
59 18,8
mobile app displaying the size of a ring on a smartphone screen, illustrating its functionality for measuring ring size

Using a smartphone app

Another way that you can discover her ring size at home is by using technology. There are many apps that can help you with ring sizing such as the Ring Sizer. It’s available on Google Play and App Store

Put one of her favourite rings on the screen and simply read the size from the screen of your smartphone. Check carefully which sizing system the app uses.
“If necessary, compare the sizes in the app with the sizes in your country”

Taking the ring to an experienced jeweller

A final and very reliable way to determine the size of her engagement ring is to make an appointment with your jeweller. Take one or several of her rings with you or draw the inner diameter on a piece of paper if she can't be without her ring. They can then use professional equipment to measure her current ring size. You will discover her size and can immediately look for the beautiful ring that will take her breath away.

How do I determine the ring size without having her current ring?

Does your partner not really have a ring that fits her perfectly? Or do you know that her current rings might not be the right size, due to weight loss or pregnancy? Then you will have to be a little more inventive in order to measure her ring size without a ring.

Ask her friends

Does your partner not really have a ring that fits her perfectly? Or do you know that her current rings might not be the right size, due to weight loss or pregnancy? Then you will have to be a little more inventive in order to measure her ring size without a ring.

Thinking outside the box

A final, creative option is observing whether she occasionally ties another object around her finger. Perhaps she sometimes plays with a hair tie or a ribbon that she wraps around her finger when she is nervous? Or another circular object that can be found in her desk? Or, have her jokingly put on a plastic toy ring belonging to your little niece or from a gumball machine. Subtlety is key here, because female intuition is never off duty!
A woman's hand elegantly holds a diamond ring, showcasing its brilliance alongside a ring sizer for accurate fitting

Not a secret after all? Measure her ring size with a ring sizer

If your partner knows that she is going to be getting a beautiful ring, then the ring sizer is the simplest way to determine her ring size. This sizer is also highly suitable for the two of you to determine the sizes for your wedding rings.
You can accurately measure the ring size with a paper ring sizer or a plastic ring sizer. First, you decide which finger the ring will be worn upon. Slide the ring sizer over that finger until it fits comfortably, so it is not too loose but also not too tight. You can then simply read the size of the ring.

Order your own ring sizer now

Print out the paper version so you can easily measure her ring size at home. Or contact us to order a plastic ring sizer. We will send you the ring sizer by post free of charge. Tip: Watch our instructional video on how to use the ring sizer correctly

The best time for measuring ring size

Did you know that there is a noticeable difference between the size of your fingers in the morning compared to the evening? That difference is of course not visible to the naked eye, but for a custom-made ring, millimetre precision is essential. Follow our tips to ensure that your beloved can wear her ring comfortably:

  • It is preferable to measure ring size in the evening. Generally speaking, your body temperature will be slightly higher, and your hands will be more warmed up. This makes the circumference slightly larger.

  • However, avoid salty foods, hot drinks and strenuous exercise just before measuring. These factors can affect the swelling of the fingers.

Is your partner pregnant, but will wear the ring after delivery? Then keep in mind that her fingers will have a slightly narrower circumference again after pregnancy.

What is the average size of engagement rings for women?

The average ring size of engagement rings for women is between 16 and 17.8 millimetres. For men, the average is above 21 millimetres. If you do not know the size, we do not recommend taking a gamble.

Try some of the tips above to measure the ring size as precisely as possible. To be certain, you should also measure on several occasions and at different times.

If you cannot ascertain her ring size exactly to the millimetre, it is better to estimate slightly larger rather than smaller. That way, you will definitely be able to slide the ring onto her finger. It would be a shame if, in the big moment, she wasn't able to admire the stunning diamond engagement ring on her finger. Equally, it is somewhat easier to make a ring a size smaller than a size larger.

Still chose the wrong ring size?

Even with the best efforts, sometimes ring adjustments are needed. Rest easy knowing BAUNAT is here to assist with any resizing requirements, safeguarding the perfection of your engagement ring. Read our guide on resizing an engagement ring after purchase.
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Browse BAUNAT diamond rings here

  • Fabienne Rauw

  • BAUNAT Antwerp

  • Fabienne, manager of the German market is able to guide every client with finding the right jewel. She takes care of most of the German orders, but also takes other task on her plate. Thanks to her six  years of experience at BAUNAT she acquainted well with the product and the marketing around it. Her degree in PR ensures that BAUNAT is well presented across all media channels. For anyone looking into a new investment opportunity, Fabienne is the perfect guide in this process. No question will be left unanswered, and she will help you every step of the way.

    Selected Bespoke Projects

    • Eternal Bloom bespoke engagement concept - Role: project lead for client briefing and prototype coordination. Fabienne translated personal design references into a 3D-printed prototype, supervised stone selection and ensured the finished piece matched the client’s vision and comfort preferences.

    • Personalized anniversary necklace - Role: design coordinator and quality overseer. She managed the custom design process from the initial sketch to final polishing, liaising between client and workshop to preserve proportions and finish.

    • Reimagined heirloom ring restoration and redesign - Role: client consultant and technical coordinator. Fabienne guided the client through options to modernize setting details while keeping sentimental elements, delivering a wearable result that respected the original piece.

    Her hands-on involvement in bespoke commissions ensures each custom order has a clear brief, careful prototype review and close follow-up with the workshop, so clients receive a tailored jewel that meets both aesthetic and practical expectations.

    Professional enquiries

    For speaking engagements, press requests or research collaborations, please send your message to BAUNAT’s communications team with the subject line: "Fabienne Rauw  -  Professional Enquiry." Include a brief description of the request and any relevant dates or documents. The communications team will route enquiries to Fabienne and provide guidance on next steps.

Fabienne, manager of the German market is able to guide every client with finding the right jewel. She takes care of most of the German orders, but also takes other task on her plate. Thanks to her six  years of experience at BAUNAT she acquainted well with the product and the marketing around it. Her degree in PR ensures that BAUNAT is well presented across all media channels. For anyone looking into a new investment opportunity, Fabienne is the perfect guide in this process. No question will be left unanswered, and she will help you every step of the way.

Selected Bespoke Projects

• Eternal Bloom bespoke engagement concept - Role: project lead for client briefing and prototype coordination. Fabienne translated personal design references into a 3D-printed prototype, supervised stone selection and ensured the finished piece matched the client’s vision and comfort preferences.

• Personalized anniversary necklace - Role: design coordinator and quality overseer. She managed the custom design process from the initial sketch to final polishing, liaising between client and workshop to preserve proportions and finish.

• Reimagined heirloom ring restoration and redesign - Role: client consultant and technical coordinator. Fabienne guided the client through options to modernize setting details while keeping sentimental elements, delivering a wearable result that respected the original piece.

Her hands-on involvement in bespoke commissions ensures each custom order has a clear brief, careful prototype review and close follow-up with the workshop, so clients receive a tailored jewel that meets both aesthetic and practical expectations.

Professional enquiries

For speaking engagements, press requests or research collaborations, please send your message to BAUNAT’s communications team with the subject line: "Fabienne Rauw  -  Professional Enquiry." Include a brief description of the request and any relevant dates or documents. The communications team will route enquiries to Fabienne and provide guidance on next steps.