In the first place, determining your ring size is pretty easy to do. All you need is a way to measure the diameter of your finger accurately. Obviously, the best way to find out your ring size is stop by your local jeweler. And it's the perfect excuse to try on some rings and see what you like!
In addition, it is also the best way to ensure a perfect fit. After all, your local jeweler has the experience to account for variables like the design and width of the ring. As a matter of fact, the width of the ring shank can affect how the ring fits on your finger. That's because the thickness of the ring will displace different amounts of flesh.
Although that may be true, you can use this printable ring size chart from Blue Nile to get an idea. Then you can fine-tune the details later if necessary. But keep in mind that a piece of paper is much thinner than the shank on an engagement ring. In that case, you might want to account for a little wiggle room when estimating your ring size. Of course, this is probably sufficient if you're just looking to help him surprise you.
How to Measure Your Finger for an Engagement Ring:
The most accurate way to size your finger for an engagement ring is to use a standard ring sizer like the one on the left. As you can see, the width of the metal rings is about the same as most engagement rings. In other words, this type of ring sizer is perfect if you're buying a Tiffany style solitaire.
As a matter of fact, this is a good way to measure your ring size for most engagement rings. Whereas you will use a ring sizer with wider bands to size your finger for a wedding band that measures more than 3-4 millimeters.
Once again, that is because a wider ring will displace more flesh upon the finger. In similar fashion, you might adjust your ring size downward to account for open space at the top of a setting.
The Best Way to Size Your Finger for a Wedding Band:
As you can see, the ring sizer on the left features wider bands than the one above. That is because this used to size your finger for a wedding band. In that case, the wider bands will account for the amount of displacement caused by a wedding band measuring 3-4 mm or more.
The process is the same whether want to size your finger for an engagement ring or a wedding band. Simply slide on different rings until you find the one that fits most comfortably.
Obviously, you don't want to force on a ring that seems to tight prior to sliding over the knuckle. After all, you don't want to get one of these stuck on your finger. At the same time, you want the ring to slip snugly over the knuckle. And be comfortable on the other side with a little bit of wiggle room.
International Ring Size Conversion Chart:
In the US and Canada, we use a numerical system to describe ring sizes in full, half, and quarter sizes. Whereas other countries describe ring sizes using letters or millimeters. For example, let's say that you're traveling in England and you want to buy a ring. Thankfully, you remember that your engagement ring is a 6.5 in the United States. In that case, you're going to want a size N ring.