1. Tear up a strip of paper (book pages are vetoed, you know how much we love them)

2. Wrap the paper snug around your finger, make sure it's nice and tight and mark the spot where it meets

3. Measure the distance with a ruler (in mm); that's your finger's circumference

4. Use the chart to find your ring size and voila, you're all set.

FINGER CIRCUMFERENCE RING SIZE FINGER CIRCUMFERENCE RING SIZE
44mm 3 56.5mm 7.5
45.6mm 3.5 57.2mm 8
47.1mm 4 58.1mm 8.5
48.7mm 4.5 60.3mm 9
50.3mm 5 61.3mm 9.5
51.2mm 5.5 62.8mm 10
51.8mm 6 63.8mm 10.5
53.4mm 6.5 65mm 11
55mm 7