Size 5: diameter - 15.7mm, or circumference - 49.3mm
Size 6: diameter - 16.5mm, or circumference - 51.8mm
Size 7: diameter - 17.3mm, circumference - 54.4mm
Size 8: diameter - 18.2mm, circumference - 56.5mm
Not sure what’s your ring size? Use this method below:
To measure the diameter of your finger, you can use a ruler to measure the width. To measure the circumference of your finger, you can wrap a thin piece of rope around the finger and then measure the length of the rope using a ruler.