Getting the right ring size is essential. Whether you’re planning a surprise proposal, upgrading your everyday ring, or just curious, knowing how to measure your ring size at home saves time and ensures a perfect fit. We’re here to make it easy for you, no guesswork or special tools yet accurate sizing from the comfort of your home.
We, at BlueStone have compiled a list of methods to make your life easier. Following are ways on how to know exact finger ring size.
What Is Ring Size?
Ring size is the inner circumference or diameter of a ring, and it’s measured in millimeters (mm) or centimeters (cm). Different countries use different sizing standards in India the numerical system is based on circumference.
Difference Between Measuring Finger vs. Ring
Measuring your finger and measuring a ring are different processes that result in different measurements related to ring size. Measuring your finger provides the circumference of your finger at the base or knuckle, while measuring a ring provides its inner diameter. The ring size is based on the finger’s circumference, and this measurement is converted to a ring size using a chart or calculation. You can measure your ring size in two main ways:
- Finger Measurement – One should use this method if they are purchasing a new ring
- Ring Measurement – One can opt for this method if they already own a well-fitting ring
How to Measure Ring Size in Centimeters or Inches
There are various ways you can measure your ring size and various metric systems too. This table is to help you navigate the metric system you’re more comfortable with. If you’re more comfortable with cm or inches, here’s how to convert:
| Circumference (cm) | Circumference (inches) | Approximate Ring Size (Indian) |
| 4.9 cm | 1.93 in | 9 |
| 5.3 cm | 2.08 in | 13 |
| 5.56 | 2.19 in | 15 |
| 5.7 cm | 2.24 in | 17 |
| 5.97 cm | 2.35 in | 19 |
Pro Tip: Always round to the nearest ring size up if you’re between sizes.
Kindly remember, 1 cm= 10 mm
1cm= 0.393701 inches
Methods to Find Correct Finger Ring Size
There are multiple methods that can aid you in the process to finding the correct finger ring size. Following is a compilation of some extremely simple and easy steps that bring accurate results. Try them to check which one is more comfortable for you.
1. How to Calculate Ring Size from an Existing Ring?
If you already own a well fitting ring then flip it over and measure the inside diameter in mm.
Formula: Ring Diameter (mm) × 3.14 = Circumference
After that match the circumference to a size chart.
Example:
Diameter = 17 mm
Circumference = 17 × 3.14 = 53.38 mm
Ring size = ~13
2. How to calculate ring size using Apps
There are various mobile apps that allow you to check your ring size by placing a ring on your screen or aligning your finger with on-screen guides. As long as your phone screen is well-adjusted you can use this method.
3. How to Know Ring Size Without any Tools
If you don’t have a ruler, paper, or string then use the following method to measure ring size:
- Borrow a ring from the person (for gifting)
- Trace the inner circle on paper
- Take the paper to a local jeweller or compare it online
Factors That Influence Ring Size Measurements
Your ring size can change depending on:
- Time of day (fingers swell in the evening)
- Weather (hot = larger size, cold= shrunken size)
- Weight changes
- Pregnancy or health conditions
Pro Tip: Measure your finger at room temperature and at the end of the day for the most accurate reading.
Tips for Calculating Ring Size Accurately
- Don’t use stretchy materials (avoid elastic)
- Measure the knuckle too in case it’s wider than the base.
- If buying a wide band ring, go a half-size up
- If you’re buying a thin band ring, go half-size down.
- Try two or three methods and compare results.
Ring Size Chart (India/US Conversion)
A ring size chart converting Indian ring sizes to US ring sizes typically shows a direct numerical correspondence, with Indian sizes often being one number higher than the corresponding US size for the same circumference. Following is a ring size chart converted between Indian and US Sizes for your convenience:
| Indian Size | Diameter (mm) | US Size |
| 10 | 15.7 | 5 |
| 13 | 17.3 | 7 |
| 16 | 18.9 | 9 |
| 18 | 19.8 | 10 |
For better precision, use our BlueStone Ring Size Guide.
Whether you’re browsing engagement rings or treating yourself to a luxury piece, a precise fit ensures your confidence and shine.
The above mentioned methods are all the methods you need to know to confirm the perfect fit. However, if you want to have the BlueStone store experience, locate your nearest store and visit us for the best measurement result!
Frequently Asked Question
The most accurate way is to measure the internal diameter of a current ring or using a reusable ring sizer.
It is advisable to size up for better comfort if the band is wide and size down if the band is narrower.
Every couple of years or if you notice a fit change.
No, most rings can easily be resized 1-2 sizes. However, if the ring has intricate designs then it might be difficult, in that case choose a jeweler you trust like BlueStone.
No, ring sizes are usually the same but men generally have larger sizes.
A ring that is too tight can cause discomfort and even restrict blood flow, while a ring that is too loose can easily be lost. You need the perfect ring size for comfort, security, and aesthetics.
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