Ring Sizing Guide and Conversion Chart

How to Measure Your Ring Size at Home

Using a sizing tool
If you don’t know your ring size, we do recommend having your finger professionally measured by a jeweller or at your local jewellery store. Try several rings of the sizing tool on to get a better understanding of which size fits better. You can also measure your fingers on two different days to find out which size fits better. 

Method 1: Using a Ring You Already Own
If you have a ring that fits you perfectly, it can serve as a guide. This method is most effective if your current ring has a similar shape and silhouette to your chosen Natt Jewellery piece. Besides your ring, you will also need a ruler with a millimetre scale. 

  1. Place your ring on a ruler with a millimeter (mm) scale.
  2. Measure the inner diameter across the widest part of the circle.
  3. The measurement in millimeters is your Dutch size (e.g., 16.5 mm = Size 16.5).

 

Method 2: The String or Paper Method
Cut a piece of string or a thin strip of paper. You won't need more than 10 cm. Prepare a sharpie or a fine-tip marker pen, and a ruler with a millimetre scale. 

  1. Wrap a piece of string or a thin strip of paper around the base of your finger. Make sure it's not too tight or too loose.
  2. Mark the exact point where the ends overlap with a fine-tip marker.
  3. Once you take the string off your finger, you will have two marks on your string. Measure the length of the marked section against a ruler. This is your finger's circumference.
  4. Consult the Sizing Chart below to find your corresponding size.
Inner diameter, mm Inner circumference, mm Dutch size French size UK size US size
13 41 13 1 C 1/2 1
13.4 42 13.4 2 D 1/2 2
13.7 43 13.7 3 E 1/2 2 1/2
14 44 14 4 F 3
14.3 45 14.3 5 G 3 1/4
14.6 46 14.6 6 G 1/2 3 3/4
15 47 15 7 H 1/2 4
15.3 48 15.3 8 I 1/2 4 1/2
15.6 49 15.6 9 J 5
15.9 50 15.9 10 K 5 1/4
16.2 51 16.2 11 L 5 3/4
16.5 52 16.5 12 L 1/2 6
16.8 53 16.8 13 M 1/2 6 1/2
17.2 54 17.2 14 N 1/2 7
17.5 55 17.5 15 O 7 1/2
17.8 56 17.8 16 P 7 3/4
18.1 57 18.1 17 P 1/2 8
18.4 58 18.4 18 Q 1/2 8 1/2
18.8 59 18.8 19 R 8 3/4
19.1 60 19.1 20 S 9
19.4 61 19.4 21 T 9 1/2
19.7 62 19.7 22 U 10
20 63 20 23 U 1/2 10 1/2
20.3 64 20.3 24 V 10 3/4
20.6 65 20.6 25 W 11
21 66 21 26 X 11 1/2
21.3 67 21.3 27 Y 12
21.6 68 21.6 28 Y 1/2 12 1/2
22 69 22 29 Z 1/2 12 3/4

 

Important Considerations for a Precise Fit

Temperature Matters: Fingers can swell in the heat or shrink in the cold. Measure your size at a neutral room temperature for the most consistent result.

The "Wide Band" Rule: The wider a ring is, the tighter it will feel on the finger.

  • For bands 9–10 mm wide, we recommend ordering half a size larger.
  • For bands wider than 10 mm, consider ordering one full size larger than your standard fit.

The Knuckle Factor: If your knuckle is significantly wider than the base of your finger, measure both areas. Select a size that sits comfortably in the middle of those two measurements to ensure the ring slides on smoothly without forcing or hurting.

 

Need further assistance?

If you are between sizes or require a bespoke fit, please contact us. We are happy to help you find your perfect fit before we begin crafting your piece in our Amsterdam atelier.