Ordering a ring online is exciting, until it's time to choose a size. Ring sizing can feel like guesswork, especially if you don't already know your measurement.
The good thing is that you don't need a trip to the jeweler to get it right. With a few household items and a couple of minutes, you can find a size that feels comfortable and fits confidently. Here's a simple ring size guide with a US size chart, and a few tips that keep the measurement accurate.
The String or Paper Strip Method
The most popular way to measure ring size at home, and the one that works when you need ring sizing without a sizer nearby.
What you need:
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A piece of non-stretchy string, dental floss, or a thin strip of paper
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A pen or marker
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A ruler with millimeter markings
Steps:
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Wrap the string or paper strip around the base of the finger where the ring will sit
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Keep the fit snug but comfortable, not so tight that the string digs in, and not so loose that a ring would slide off
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Mark the point where the string or paper overlaps
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Lay the string flat against a ruler and measure the length in millimeters
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Compare the measurement to the US ring size chart
Tip: If the finger has a larger knuckle, measure both the knuckle and the base of the finger, then go with a size somewhere between the two. The ring needs to pass over the knuckle comfortably but still sit securely at the base.
Using a Ring You Already Own
Have a ring that already fits the finger well? That makes the process even easier.
With a ruler:
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Place the ring on a flat surface
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Measure the inside diameter (edge to edge across the center) in millimeters
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Compare the diameter to the ring size chart below
With a printable ring sizer:
Place the ring directly on a printable ring size guide and match the inner circle of the ring to the corresponding size. Just make sure the guide is printed at 100% scale for accuracy.
US Ring Size Chart
|
US Size |
Inside Diameter (mm) |
Inside Circumference (mm) |
|
4 |
14.9 |
46.8 |
|
5 |
15.7 |
49.3 |
|
6 |
16.5 |
51.9 |
|
7 |
17.3 |
54.4 |
|
8 |
18.1 |
57.0 |
|
9 |
19 |
59.5 |
|
10 |
19.8 |
62.1 |
|
11 |
20.6 |
64.6 |
|
12 |
21.4 |
67.2 |
If the measurement falls between two sizes, sizing up is usually the safer call, especially for wider bands.
Tips for an Accurate Measurement
A few small details make a big difference when trying to find your ring size:
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Measure later in the day: Fingers tend to be slightly larger in the afternoon and evening. Measuring first thing in the morning or right after a cold walk can give a smaller reading than the true fit.
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Avoid measuring very warm or cold hands: Heat causes fingers to swell, and cold causes the opposite. Room-temperature hands give the most reliable result.
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Account for band’s width: Wider rings (like statement bands) sit more snugly than thin stacking rings. If the ring has a wider band, going up a half size tends to feel more comfortable.
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Measure more than once: Taking two or three measurements on different days and at different times confirms consistency. If the numbers vary, go with the larger measurement.
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Consider the specific finger: The same finger on each hand can be slightly different in size. Always measure the exact finger where the ring will be worn.
Find Your Perfect Fit
Finding your ring size at home is easier than it seems. Whether you use a string, paper, or a ring you already own, a few quick measurements can help you find your ring size with confidence and make online ring shopping a lot less stressful.
If you'd rather skip the guesswork, the James Michelle ring sizer makes measuring at home even more accurate. You can also refer to our ring sizing guide anytime for sizing tips and measurements before choosing your next favorite ring.
Frequently Asked Questions
Can you measure ring size with just a piece of string?
Yes. Wrap a non-stretchy string around the finger, mark where the ends meet, lay the string flat, and measure the length in millimeters. Compare to a US ring size chart.
Should you size up or down if between sizes?
Sizing up is usually the safer choice, especially for wider bands. A ring that's slightly loose is more comfortable than one that's too tight.
Do fingers change size throughout the day?
Yes. Fingers tend to swell slightly in the afternoon and evening and shrink in cold temperatures. Measuring later in the day gives the most accurate fit.
Can you use a ring from a different finger to find your size?
Only if the ring fits the same finger where the new ring will be worn. Finger sizes vary between hands and between fingers, so measuring the exact finger is more reliable.
Does the band’s width affect the ring size?
Yes. Wider bands sit more snugly because more metal contacts the skin. Going up a half size for wider bands tends to feel more comfortable.
What material works best for a DIY ring measurement?
Non-stretchy string, dental floss, or a thin strip of paper all work well. Avoid elastic or rubber bands since the stretch throws off the measurement.
