Need some help getting the perfect ring fit? I got you.  

I’ve developed this handy and easy-to-use size guide which will help you find the right size. 

Option 1

No printer required

  • Find a ring that fits the intended finger.
  • Grab a ruler or tape measure and measure the inside diameter of the ring (in millimetres).
  • Match up your measurement to the chart below to find your Hey Luna size (sizing is the same as US/CAN), if your size falls between two measurements always size up.


Option 2

Printer required

Download and print our ring size guide on A4 paper at 100% sizing. You can then;

 Measure an Existing Ring You Own

  • Find a ring that fits the intended finger.
  • Place the ring over the printed circles. Matching the inside edge of the ring to the circle nearest in size. This measurement refers to the inside diameter of the ring.
  • If the ring falls between two sizes, order the larger size.


Measure Your Finger

  • Cut out the sizer template.
  • Wrap the sizer around your finger and pull the end through the slot until the sizer wraps comfortable around the base of your finger. Don’t pull the end too tightly.
  • Now look at the number the arrow is pointing to. That’s your ring size! If your knuckle is bigger than the base of the finger, measure both and choose a size in between.

Option 3

Purchase our ring sizer here

Not 100% sure of your ring size? Forget the hassle of having to exchange your ring and instead get the right fit the first time. This compact ring sizer is flexible, reusable and accurately sizes fingers from 1-17 US.


INSIDER TIP: Fingers get bigger through the day. Who knew? So it’s best to measure in the afternoon or evening for the most comfy fit. If your knuckle is much larger than your finger’s base, take two separate measurements and choose a size in between.