How To Measure

One of the things Engagement and Weddings has in common is Ring. Ring, because of its circular nature with no end is often exchanged as a symbol of love, honor and devotion.  It is important you find your ring size if you are planning on the together forever journey.

When it comes to how to measure ring size, the best way or the most accurate way to get a properly fitted ring is to visit a local jeweler’s shop.

However, you can use a ring size chart, plastic ring sizer, printable ring guide and other ring size measuring tips if you prefer to measure ring size at home.

This ring size guide walks you step by step through everything you need to find your ring size.

Request A Free Ring Sizer To Measure Your Ring Size

Primestyle understands that you might not know the ring size for a particular finger. We are willing to send you a free plastic ring sizer so that you can easily measure your ring size at home.  The shipping and delivery time of these plastic ring sizers varies from places to places, for example within US and Canada, it takes 5 to 7 business days and could take more time to other places.

Measure Your Ring Size With A Printable Ring Size Guide

Peradventure you can’t wait for a plastic ring sizer and would like determine your ring size immediately at home, then you should download our printable ring size guide. It is important you read carefully and follow the instructions to the letter so as to get the best results.

How To Measure Ring Size At Home


To measure with a string you will need the following

  • String/Floss
  • Ruler
  • Pen/Marker

How to measure:

  • Cut a string that is about 6 inches long
  • Fold the string around the base of the finger just below the knuckle
  • Mark where the string ends with the pen
  • Placed the measured string on the ruler with the area marked on your right
  • The number closest to the penmark is the circumference of the ring in mm
  • Use the ring size chart below to translate the measurements in a ring size


To measure the ring size using strip of paper, you will need the following

  • Strip of paper
  • Ruler
  • Pen/Marker

How to measure:

  • Cut a thin strip of paper about 100mm long
  • Fold the thin strip of paper around the finger at the base and close enough to your knuckle
  • Mark the area where the paper strip meets,
  • Use the ruler to measure the length in mm to give you the circumference
  • Covert  to  ring size using the ring size chart below


To measure the ring size using a ring that fits, you will need the following

  • A ring at home that fits that finger
  • Ruler

How to measure:

  • Measure the internal diameter of the ring (that’s the hole inside the ring excluding the metal)
  • Write down this measurement in millimeters and use the conversion chart below to find your  ring size

Ring Size Measuring Tips

The following are important tips to consider when measuring ring size


Finger size changes often as a result of the temperature. Fingers get bigger in warm weather and shrinks in cold weather.

Measure your finger in warm temperatures and at the end of the day particularly for engagement rings or wedding ring that will be worn every day for a long period of time


Ring should fit snugly on your finger that means it should go on easy but come off hard. That’s what makes a ring properly sized as it minimizes the risk of loss and it won’t put too much pressure on your fingers. Checking your size more than once will help you achieve this

Measuring several times is not going too far as that could help you to get the right fit for the first time. It will also prevent you from expediting unnecessary time, money and energy to resize


Wide rings (about 6mm or more) require larger size for most people this is because wide band allows “more finger” under the band than narrow rings. Add .25 to .5 size for rings with wider styles.

For instance, if your ring size is 6 after measuring, make it 6.25 or 6.5 if you are going for the wider band.

Furthermore, some rings are difficult to resize or are often impossible to size without a loss in the aesthetic. So it’s important to get the size right for those type of rings.


Our primary hands are generally slightly larger (about half a size), it is important you measure the left hand or whatever finger you plan to wear the ring on to avoid error.


If the base of your finger is a lot smaller than your knuckle, and you're using the virtual ruler, measure both the base of your finger and your knuckle and select a size in between the two

That will help you chose a size that will slide over your knuckle but won’t be too large to be comfortably worn on the base of your finger


When two sizes seem to fit or if you get two different finger measurements, it’s advisable you go for the bigger measurement or consult a professional if you can

Take measurements in millimeter for best measurements.

How To Measure Ring Size Without Her Knowing

The beauty of proposals is when it comes as a surprise. Getting the right ring size makes it not only perfect but also challenging. Asking your partner directly for her ring size will definitely ruin a bit of the surprise element. Here are few tips to get it right.


This can be her best friend, her sister or her mum. The can give you the idea of what her ring size is or help to measure her ring size without her suspecting a thing.

If you are using this method, endeavor to ask only trustworthy people who may actually know. It is more likely that the news of your gift will reach her prematurely if you ask too much friends or those that aren’t secret worthy


Borrowing from her collections and taking to the jeweler might be helpful only if she will not notice that one of her rings have been taken.

However, if you have a limited access to it, especially if she only takes it off once a while, then take a quick moment when she removes it and won’t see you to trace around the inside of a ring on a piece of paper or buy a bar of soap and press the ring in to make a mold. The paper or the soap can then be taken to the jeweler for the perfect ring size.


This method is fairly accurate but enough to produce great result especially if you are desperate and no other option seems to work. Compare her fingers with yours while holding her hands. For example, you can compare your pinky finger with her ring finger to give you a rough estimate of her ring size.


Sometimes you just need to be creative to get the Job done.

You can measure her fingers with string, paper or thread while she is sleeping on the pretence that you are caressing her fingers


You may also play games with her that might end up with a clue to her actual ring size. Example is to play a Newlywed Game-style personal trivia game.

All you need is to write a different random personal question on each index card. Make one of the questions about ring size. Both players write down their guesses about the other player as each card is being played.  Points are being given for each correct answer. At the end, you will have your ring size and a fun filled evening.


When she is not the type that wears ring, then you will need extra effort to figure out her ring size. One way around this is to casually take her to a jewelry or accessory store, politelyasks your girlfriend to try on some rings for fun as you intend to buy for your sister or mum as a gift.

Take note of the size that fits her perfectly, or you can buy it secretly. Make sure you end up buying something cool for your mother or sister so that she girlfriend doesn’t get suspicious.

Resizing/Changing Rings Size

Diamond rings are gifts that are meant to last forever, but what if the finger it’s meant for shrinks or grows?

People change as they age, and you might find that you need to have your ring resized.

Most simple rings can easily be resized by a jeweler. For rings that have diamonds set in the band however, a ring resizing may be impossible. This is especially true if the ring has channel set diamonds, which could become displaced from any metal work.

If a ring does become too small or large and cannot be resized, you can also have a new band created for your current diamonds.

International Ring Size Conversion Chart

Ring sizes vary from country to country. In the US the sizes range from 0 to 20, and include quarter fractions, so for instance you might have a ring size of “12 ¾” or “15 ½”. Though you want to be as accurate as possible, people often get a size that is just a little larger, especially if it going to be worn for a long time (engagement rings or wedding rings).

If you are looking to buy diamond rings online, they are generally shown in US sizes unless the website is designed for selling diamond rings to a specific country.

However we got you covered with our international ring size conversion chart. Simply use the drop down menu below, select your ring size from the available options and it will automatically convert it for you! It’s that simple.

Option 1: Use sizer to measure finger.


  • Cut out the sizing guide to the right.
  • Wrap the sizer around the knuckle (or widest part) of the finger to be sized. Start by placing the flat end of the strip on the finger, and wrap the arrow end around until the fit is snug.
  • Once wrapped, the number closest to the arrow point is the ring size. Hash marks between the numbers represent half sizes. If in doubt, move up the next largest half size.


Option 2: Use a current ring.

If you have a ring that fits the finger to be sized, place it over the circles below, matching the inside edge of the ring to the drawing. If the ring falls between two sizes, choose the larger size.


Option 3: Use a string.

If you have measured the finger to be sized with string, or know the circumference in millimeters, use the following chart to convert the length to a ring size. If in doubt, move up to the next largest half size.

Size 1
39.1 mm
Size 1.5
40.4 mm
Size 2
41.6 mm
Size 2.5
42.9 mm
Size 3
44.0 mm
Size 3.5
45.2 mm
Size 4
46.5 mm
Size 4.5
47.8 mm
Size 5
49.0 mm
Size 5.5
50.3 mm
Size 6
51.7 mm
Size 6.5
53.1 mm
Size 7
54.3 mm
Size 7.5
55.6 mm
Size 8
57.2 mm
Size 8.5
58.4 mm
Size 9
59.7 mm
Size 9.5
60.9 mm
Size 10
62.2 mm
Size 10.5
63.5 mm
Size 11
64.7 mm
Size 11.5
66.0 mm
Size 12
67.2 mm
Size 12.5
68.5 mm
Size 13
69.7 mm
Size 13.5
71.0 mm