How to Measure Ring Size : A Complete Ring Size Guide

If you plan to buy a ring for yourself or someone else, you must know the correct size. Rings that are too tight or loose can be uncomfortable, inconvenient, or unsafe. But how do you measure ring size accurately and efficiently? This article will show how to measure ring size using different methods and tools. 

You can use several methods to measure your ring size at home, depending on what you have available.

How to Measure Ring Size Online?

You can measure your ring size online using these tools.

  • Using an online ring sizer. This method involves using an online tool that simulates a ruler or a measuring tape on your screen. You then place an object with a known width, such as a credit card or a driver’s license, on your screen and adjust the scale until it matches the object’s width. You then place your finger on the screen and measure its diameter using the tool. To find your ring size, compare your measurement to a size chart, such as the one below. This method is accurate but depends on your screen resolution and calibration accuracy.
  • Using an online ring size converter. This method involves using an online tool that converts different measurements into ring sizes. Depending on your availability, you enter your measurement in millimeters or inches and select your preferred sizing system (US, UK, EU, etc.). The tool will then calculate your ring size for you. This method is very accurate, but it requires that you already have a measurement of your finger or a well-fitting ring.

Ways to Measure Ring Size at Home

Use a string/paper and measuring tape

measure ring size

This method involves wrapping a flexible measuring tape or a string around your finger close to the knuckle. You then mark where the tape or string overlaps and measure the length in millimeters or inches. To find your ring size, compare your measurement to a size chart. This method is simple and convenient, but it may not be exact, especially if the tape or string is not tight enough or too tight.

Using a printable ring sizer

This method involves printing a ring sizer from an online source and cutting it out. You then wrap the paper around your finger and slide the end through the slit to form a ring. You can then read your ring size from the scale on the paper. This method is more accurate than the tape or string method but requires access to a printer and scissors.

Using Ring Size Chart

This method involves printing a ring size chart from an online source and placing a ring that fits you well on top of it. You then match the inside diameter of your ring to the circles on the chart and find your ring size. This method is very accurate but requires access to a printer and a well-fitting ring.

A sample ring size chart shows different millimeters and inches measurements for US sizes.

US Size Diameter (mm) Diameter (in) Circumference (mm) Circumference (in)
3 14.1 0.55 44.2 1.74
3.5 14.5 0.57 45.5 1.79
4 14.9 0.59 46.8 1.84
4.5 15.3 0.60 48 1.89
5 15.7 0.62 49.3 1.94
5.5 16 0.63 50 2
6 16 0.65 51 2
6 16 0.65 51 2
6.5 16.9 0.67 53.1 2.09
7 17.3 0.68 54.4 2.14

Tips and Tricks for Measuring Ring Size

Here are some tips and tricks to help you measure your ring size more accurately and efficiently:

  • Measure your finger at the end of the day, when it is likely to be the largest due to swelling.
  • Measure your finger when warm, not cold, as cold fingers tend to shrink in size.
  • Avoid measuring your finger when wet, as water can make it slippery and affect the measurement.
  • If you want to buy a wide band ring, choose a size that is half a size larger than your standard size, as wide bands tend to fit tighter than narrow bands.
  • Check the return policy and warranty of the seller if you are buying a ring online in case you need to exchange or resize your ring.

Frequently Asked Questions

Here are some frequently asked questions about ring sizes and how to measure them.

How do I know if my ring size is correct?

The best way to know if your ring size is correct is to try on the ring and see how it feels on your finger. A well-fitting ring should slide on easily but resist a bit when coming off. It should not be too loose or tight and should not cause discomfort or pain.

How can I measure someone else’s ring size without them knowing?

If you want to surprise someone with a ring, you can try to measure their ring size without them knowing by using one of these methods:

  • Borrow one of their rings that fits the finger you want to measure and use a printable ring size chart or an online ring size converter to find out their size.
  • Use a piece of paper or string to wrap around their finger when sleeping or not paying attention and mark where it overlaps. Then measure the length and compare it to a ring size chart or an online ring size converter.
  • Ask one of their friends or family members if they know their ring size or if they can help you find out.

How does temperature affect ring size?

Temperature can affect ring size by slightly increasing or decreasing finger size, depending on the weather. Generally, your fingers tend to be more prominent in warm weather and smaller in cold weather, so you may need to adjust your ring size accordingly.

How does pregnancy affect ring size?

Pregnancy can affect ring size, resulting in fluid retention and swollen tissues of your fingers, especially in the third trimester. It can make your rings feel tighter and more uncomfortable, so you may need to wear a larger size or avoid wearing rings altogether until after delivery.

How does weight loss or gain affect ring size?

Weight loss or gain can affect ring size because it can change the shape and size of your fingers and the amount of fat and muscle tissue in them. Generally, losing weight can make your rings looser and more likely to fall off, while gaining weight can make your rings tighter and more challenging to remove.


Measuring your ring size is essential before buying a ring for yourself or someone else. You can use a flexible measuring tape, a string or paper strip, or a ring that fits to determine the size of your rings at home. You can also use a printable ring size chart to convert your measurements to your size.

Following these steps and tips, you can find your ring size quickly and accurately. We hope this article has been helpful for you to learn how to measure your ring size at home using online tools or printable charts.

Remember that obtaining the ideal fit is crucial for comfort and style, so feel free to ask for help from a professional jeweler if you have any doubts or questions about your ring size.

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