How to Measure Ring Size in cm

How to Measure Ring Size in cm

Are you tired of guessing your ring size and ending up with ill-fitting jewelry? Knowing your ring size is crucial when buying rings, whether for engagement, wedding, or fashion. Measuring in centimeters offers precision and ease, especially with international sizes. This guide will walk you through everything you need to know to measure your ring size accurately in centimeters.

How to Measure Ring Size in cm
How to Measure Ring Size in cm
Common Ring Size RangesWomen’s: 5-7 cm, Men’s: 7-9 cm
Measurement MethodsPrintable Ring Sizer, String/Paper, Ring Size Chart, Professional Tools
Tools NeededRuler, String/Paper, Printable Ring Sizer, Ring Size Chart
Printable Ring Sizer AccuracyHighly accurate if printed to correct scale
String/Paper Method AccuracyModerate accuracy, depends on careful measurement
Ring Size Chart AccuracyHigh accuracy when matching existing rings
Professional Measurement AccuracyVery high, due to expert tools and techniques
Finger Size Variation Throughout the DayFingers can swell or shrink by up to 0.5 cm
Impact of TemperatureHot weather: Fingers swell; Cold weather: Fingers shrink
Average Finger SwellingUp to 0.5 cm in hot weather
Conversion Example (US to cm)US size 7 = 5.4 cm inner circumference
Conversion Example (UK to cm)UK size N = 5.4 cm inner circumference
Average Ring Size Increase for Wide BandsTypically 0.1-0.2 cm larger than narrow bands
Average Measurement TimePrintable Sizer: 5 minutes, String/Paper: 10 minutes, Professional: 15 minutes
Frequency of Rechecking Ring SizeRecommended every 1-2 years or with significant weight change
Most Common Measurement MistakeMeasuring at the wrong time of day or with swollen fingers

Understanding Ring Sizes

Different Measurement Systems

Ring sizes can vary by country, with the US, UK, and other regions using different systems. The US uses numerical sizes, while the UK uses alphabetical sizes. Knowing these systems helps you understand how to convert sizes.

Conversion Between Systems

Conversions are essential when buying rings internationally. For example, a US size 7 might correspond to a UK size N. Conversion charts are handy tools to ensure you get the correct size.

Ring Size Calculator Tool

Are you unsure about your ring size and need a quick and easy way to find out? Try our Ring Size Calculator tool below. Simply follow the instructions and get your accurate ring size in just a few steps.


  1. Wrap a Strip of Paper Around Your Finger: Take a strip of paper or string and wrap it around the base of the finger you plan to wear the ring on. Make sure it’s snug but not too tight.
  2. Mark the Point of Overlap: Use a pen or pencil to mark the point where the end of the strip overlaps with the rest of the paper or string.
  3. Measure the Length: Carefully unwrap the paper or string and measure the length from the end to the marked point using a ruler (in centimeters).
  4. Enter the Measurement: Input the measured length (in centimeters) into the calculator below.
  5. Get Your Ring Size: Click on the “Calculate” button to instantly find out your ring size based on the measurement provided.

Ring Size Calculator:

Ring Size Calculator

Ring Size Calculator


  • For best results, measure your finger at the end of the day when it’s at its largest size.
  • Take multiple measurements to ensure accuracy and consider any fluctuations due to temperature changes.

Try our Ring Size Calculator tool now and discover your perfect fit for any ring!

Tools Needed for Measuring Ring Size in cm

Printable Ring Sizer

A printable ring sizer is a simple tool you can find online. Print it out, cut it, and use it to measure your ring size.

String or Paper Strip

A piece of string or a thin strip of paper can also work. Wrap it around your finger, mark where it overlaps, and measure the length with a ruler.

Ring Size Chart

A ring size chart can help you match your measurements with the corresponding ring sizes. This is particularly useful if you already have a ring that fits well.

Professional Tools

Jewelry stores have professional tools like ring sizers and mandrels that provide accurate measurements. Visiting a jeweler can ensure you get the right size.

Ring Size Chart In CM

Here’s a simple ring size chart in centimeters:

Ring Size (US)Ring Size (UK)Inner Circumference (cm)
3F4.4 cm
3.5G4.6 cm
4H4.8 cm
4.5I5.0 cm
5J5.2 cm
5.5K5.4 cm
6L5.6 cm
6.5M5.8 cm
7N6.0 cm
7.5O6.2 cm
8P6.4 cm
8.5Q6.6 cm
9R6.8 cm
9.5S7.0 cm
10T7.2 cm

Step-by-Step Guide to Measuring Ring Size in cm

Using a Printable Ring Sizer

  1. Print the ring sizer at 100% scale.
  2. Cut out the sizer and wrap it around your finger.
  3. Note the measurement where the sizer overlaps.

Using a Piece of String or Paper

  1. Cut a piece of string or a strip of paper.
  2. Wrap it around the base of your finger.
  3. Mark the point where the string or paper overlaps.
  4. Measure the length in centimeters using a ruler.

Using a Ring Size Chart

  1. Find a ring that fits well.
  2. Place it on a ring size chart.
  3. Match the inner diameter of the ring with the chart.

Visiting a Jewelry Store

  1. Visit a reputable jeweler.
  2. Ask for a professional ring sizing.
  3. Try different ring sizes to find the perfect fit.

Tips for Accurate Measurements

Measuring at Different Times of the Day

Finger sizes can fluctuate throughout the day due to temperature and activity. Measure your finger at different times to get an average size.

Considering Weather and Temperature Changes

Hot weather can cause fingers to swell, while cold weather can make them shrink. Measure your ring size in a comfortable environment.

Taking Multiple Measurements

Take multiple measurements to ensure accuracy. This reduces the risk of errors and helps you find the most consistent size.

Account for Ring Width

Wider bands may require a slightly larger size for comfort. Consider this when choosing your ring size.

Understanding Measurement Systems

US Sizing

The US system uses numerical sizes, typically ranging from size 4 to size 13 for adults.

UK Sizing

The UK system uses letters, from A to Z. It’s essential to convert accurately when buying rings internationally.

International Conversions

Use conversion charts to switch between US, UK, and other international sizes. This ensures you get the right fit regardless of where you buy your ring.

Common Mistakes to Avoid

Ignoring Finger Swelling

Finger swelling can lead to incorrect measurements. Measure your size when your fingers are at a normal state.

Using Incorrect Tools

Ensure you use accurate tools like a printable sizer, string, or professional ring sizers for precise measurements.

Not Rechecking Measurements

Always double-check your measurements to avoid errors. This is especially important if you’re buying an expensive ring.

Why Professional Measurement is Recommended

Expertise and Accuracy

Jewelers have the expertise and tools to measure your ring size accurately. They can also provide advice on the best fit for different ring styles.

Availability of Resizing Options

Professionally measured rings are easier to resize if needed. Jewelers can make adjustments to ensure a perfect fit.

DIY vs. Professional Measurement

Pros and Cons of DIY

DIY methods are convenient and free but may lack precision. They are great for initial measurements but may not be as accurate as professional tools.

Benefits of Professional Services

Professional services provide the most accurate measurements and offer resizing options. They also allow you to try on different styles to find the best fit.

Ring Size Conversion Charts

US to UK Conversion

Conversion charts help you find the equivalent sizes between different measurement systems. For example, a US size 7 is approximately a UK size N.

International Conversion

International charts provide conversions between US, UK, and other systems. This is crucial when buying rings from different countries.


Knowing how to measure your ring size in centimeters ensures you get a perfect fit every time. Whether you use a printable sizer, a piece of string, or visit a professional jeweler, accurate measurements are key. Remember to consider factors like finger swelling and weather changes to avoid mistakes. With this guide, you’ll be well-equipped to find the ideal ring size for any occasion.


How tight should a ring be?

A ring should be snug but comfortable. It should slide over your knuckle with some resistance and not feel too tight around the finger.

Can I measure ring size with a ring I already own?

Yes, you can use a ring size chart to match the inner diameter of an existing ring. This is an easy way to find your size.

What if my ring size is between two sizes?

If your measurement falls between two sizes, it’s generally best to go for the larger size. You can also consider the ring’s width and style.

How often should I recheck my ring size?

It’s a good idea to recheck your ring size if you experience significant weight changes or if you haven’t measured in a long time. Finger sizes can change over time.

Can weather affect my ring size?

Yes, weather can impact your ring size. Fingers may swell in hot weather and shrink in cold weather, so it’s important to consider these factors when measuring.

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