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With the internet providing us with access to every corner of the globe, we rarely need to leave the comfort of our own homes to run errands, exercise, get food—basically, do anything. The same should be true when it comes to measuring your ring size before ordering from the best jewelry stores or hinting to your boyfriend about some unique engagement rings you’ve had your eye on. You could go to a jeweler, but that doesn’t really fit with your whole do-it-all-from-my-couch thing. (It also ruins the subtlety of accidentally leaving a browser open on your partner’s computer with a few simple engagement rings pulled up—they’ll get the hint soon enough.)

According to Catbird, a popular fine jewelry store in Brooklyn, “your ring should fit your finger comfortably; snug enough so that it does not fall off, but loose enough to slide over your knuckle with some resistance.”

Ring sizes in the United States are measured on a scale of numbers (and half numbers), typically ranging from ring size 3 to 13.5 for adults. Women’s rings are typically sized between 3 and 9, whereas men’s rings are typically sized between 8 and 14. These measurements correspond to the width of your finger in millimeters: A ring size 3 fits a ring finger (or any finger) that is 14 millimeters across, and the sizes increase from there. The average ring size for women is between 5 and 7, but it’s always best to get an exact ring measurement before spending a lot of money—the average engagement ring cost isn’t cheap.

Before you sit down to measure your ring size, keep the following tips in mind:

Consider your knuckle. If you know your knuckle is on the larger side, order half a size larger than what your finger alone indicates, or you won’t be able to slide a ring into the right place.
Attempt several times to ensure accuracy. According to Catbird’s website, you should measure your finger three to four times because the size varies depending on temperature: it can be smaller if you’re cold and more swollen if you’re hot.
Here are three common and simple ways to measure your ring size at home—using string, a ring size chart, and a ring sizer—so you can get the right piece of jewelry, whether it’s a treat-yourself gift or a wedding ring.

Option one: Use string or floss to measure your finger.


How to Measure Ring Size at Home – String Method for Men and Women

You can measure your ring size with string or floss, which is probably a more common item in your home. Wrap one of these measuring tools around the base of your finger and mark with a pen where the string or floss first overlaps. Then, line it up with a ruler and measure its length in millimeters.

With standard ring sizes, each half-size corresponds to a 0.4-millimeter increment, with size 3 equaling 14 mm, size 3.5 equaling 14.4 mm, size 4 equaling 14.8 mm, and so on. Women’s ring sizes range from 6 (16.5 mm) to 6.5 (16.9 mm) (17.3 mm). For men, the most common sizes are 10 (19.8 mm), 10.5 (20.2 mm), and 11 (20.6 mm).

A Ring Size Chart to Help You Determine What Size Ring You Need

The ring size chart above should tell you how many millimeters the matching circle is as well as what ring size that measurement corresponds to.

There is one caveat to this method: string and floss can stretch, so don’t stretch your measuring tool too taut. If you do, your measured ring finger size may be larger than your actual finger size, and any rings you purchase may be too large.

Option two: Measure the size of an existing ring on a ring size chart.
how to use a sizing chart to determine your ring size based on rings you already own

You can measure your ring size with a piece of jewelry that you already own and know fits you. Print out a true-to-size ring size chart, such as this one from Catbird, and place your ring on the circles until you find the one that corresponds to the inside circumference of your ring.

Option three: Purchase your own ring sizer Measurement tool and ring size chart for men and women

If you are concerned that one of the above two methods will not provide accurate results, you can buy your own ring-measurement tool. They are not typically expensive, and there are numerous options available online, so you do not need to leave your home to complete this step.

The best-reviewed ring-sizing tools fall into two categories: a thin measuring tape and a keyring lined with a gradient of ring sizes. McGee Jewelry has a top-rated measuring tape that works like a mini belt and has a sliding plastic arrow marker to measure your ring size ($3; amazon.com). It is available in ring sizes 1 through 17 for women, men, and children. Mudder’s top-rated ring of rings ($8; amazon.com) lets you try on sizes 1 through 13, including half sizes. It also works for men, women, and children.

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