Engagement ring

Guide to Ring Sizers

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When you want to surprise a loved one with a stunning ring, it’s helpful to have the ring size. But how can you keep it a surprise but get an accurate size? Believe it or not, there are several strategies you can use. Keep reading for ways to measure ring size, factors that impact the size of your fingers and some helpful tips to determine your partner’s ring size.

How to Determine Ring Size?

Consider using more than one ring size method for a "measure twice, cut once" approach to ring sizing. It’s much less trouble if you carefully measure the ring size initially to avoid resizing in the future. Whether you’re shopping for an engagement, wedding, everyday or fashion ring, it’s important to measure carefully if you can. Here are some helpful tips to determine ring size:

  • Measure another ring that fits the same finger: Take one of your other rings, measure the inside diameter, and compare it to the size chart below to find the approximate fit.
  • Use a Paper Strip: Use the paper strip at the bottom of this printable chart. Cut out the ruler and wrap it around your finger. Ensure it's a snug fit. Use the line demarcations to see what your ring size is.
  • Use string or dental floss: Take a piece of string or floss and wrap it around your finger (but not too tight). Mark the place where the string or floss meets and measure against the With Clarity size guide to get the approximate size.
  • Get your finger measured professionally: You can visit a jeweler who will use a mandrel (aka ring tool) in-store to determine your ring size. These are metal or plastic rings in different sizes that you’ll try on to find the perfect fit. You can also order a ring sizing kit online to find your ring size from home.

Here’s a band size chart for reference and here’s a printable ring sizing guide:

Inside Circumference US/Canada British/Irish/Australian Japanese French German
Inches MM
1.840 46.8 4 H 7 46 1/2 15
1.890 48.0 4.5 I 1/2 8 47 3/4 15 1/2
1.940 49.3 5 J 1/2 9 49 15 3/4
1.990 50.6 5.5 K 1/2 10 50 1/4 16 1/4
2.041 51.8 6 L 1/2 11 51 1/2 16 1/2
2.091 53.1 6.5 M 1/2 13 52 3/4 17
2.141 54.4 7 N 1/2 14 54 17 1/4
2.192 55.7 7.5 O 1/2 15 55 1/4 17 1/2
2.242 56.9 8 P 1/2 16 56 1/2 18
2.292 58.2 8.5 Q 1/2 17 57 3/4 18 1/2
2.342 59.5 9 R 1/2 18 59 19
2.393 60.8 9.5 S 1/2 19 60 1/4 19 1/2
2.443 62.1 10 T 1/2 20 61 1/2 20
2.493 63.3 10.5 U 1/2 22 62 3/4 20 1/2
2.543 64.6 11 V 1/2 23 64 20 3/4
2.594 65.9 11.5 W 1/2 24 65 1/4 21
2.644 67.2 12 X 1/2 25 66 1/2 21 1/4
2.694 68.4 12.5 Z 26 67 3/4 21 3/4
2.744 69.7 13 Z 1 27 69 22
2.795 71 13.5 Z 2 29
2.845 72.3 14 Z 3 31
2.895 73.5 14.5 Z 4 32
2.945 74.8 15 Z 5 33
2.996 76.1 15.5 Z 6
3.046 77.4 16 Z 7
3.096 78.6 16.5 Z 8
3.146 79.9 17 Z 9
3.197 81.2 17.5
3.247 82.5 18
3.297 83.7 18.5
3.347 85.0 19
3.397 86.3 19.5
3.448 87.6 20

What Influences Ring Size?

Some factors can influence your ring size and make it fluctuate:

  • Temperature: if your hands are colder, then your fingers will be smaller. Your fingers change size depending on the weather, so keep this in mind when you measure.
  • Diet: Salty foods and processed foods with higher sodium levels will make your fingers swell.
  • Pregnancy: Sometimes pregnancy can make your fingers swell, which makes measuring more challenging.

In addition to factors like temperature, there are a couple additional considerations to keep in mind:

  • Finger shape: take a look at your partner’s finger shape. Do they have larger knuckles but smaller fingers? If so, you’ll need to size to get over the knuckle.
  • Band width: Wider bands tend to fit more snugly than narrow bands, so the width of the ring sizer will affect the size. Generally, if sized with a narrow ring sizer, you would want to size up 1/4 size for rings 5-6mm wide and 1/2 size for rings 7-8mm wide.

When to Measure?

Measure your ring size at the end of the day when your fingers are warm. Finger size changes depending on the time of day and the weather, and your fingers are actually smaller in the early morning and in cold weather. Also, keep in mind that fingers on your dominant hand are usually larger.

Sizing Tips

We’ll wrap up with a few helpful tips on getting the right ring size for your partner:

  1. Discreetly work on figuring the ring size while your loved one sleeps by tracing a ring
  2. Ask for help from others (mom, friends, your friends, a jeweler)
  3. Playfully ask just for fun to see if you get an answer
  4. Select a ring in an average ring size
  5. Try a larger size and resize it later
  6. Buy a costume ring for your loved one to see if you can determine the correct size

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Frequently Asked Questions

  • Is it better to size a ring up or down? It’s better to size up. If you do have to get it resized in the future, then it’s easier to do that with a bigger ring.
  • Can I measure my ring size at home? Yes, there are several methods to measure your ring size at home (measure a ring you already own, use paper or dental floss to measure your finger, purchase a ring sizing kit).
  • How can I find out my ring size online? Measure your ring size and compare it to an online ring chart, like the one above. Or, print out this guide to help.
  • How tight should your ring be? A proper fitting ring should slide over your knuckle with a little friction and fit snugly on your finger, but not too tight. You should feel resistance and need to apply a little extra force to remove the ring backwards over your knuckle.
  • Do ring sizers and sizes differ in the UK, USA and Canada? The US, Canada and Mexico have the same ring sizes and use numerical values with quarter and half sizes for ring size measurement. UK, Australia, New Zealand, Ireland ,and South Africa have the same ring sizes and use the letters of the alphabet with half sizes for ring sizes. Most women's rings in the USA and Canada are between sizes 3 and 9, while men's rings are usually sized between 8 and 14. The most common average women’s ring sizes are from size 6 to 7.
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