Smart Ring

Smart Ring UK — Memoriex Hero

Wellness, Worn Beautifully. Discover the next generation of wearable health technology — smart rings that track your heart rate, sleep stages, blood oxygen, and daily activity with discreet elegance. No bulky screen, no daily charging. Just intelligent health monitoring worn like jewellery, all day and all night. Makes a brilliant gift for health-conscious friends, tech enthusiasts, and professionals. Free UK delivery.

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Health Tracking Rings  ·  Sleep Monitoring Rings  ·  Fitness Rings  ·  Smartphone Connected Rings  ·  Smartwatches  ·  Health & Wellness

Perfect For

Gifts for Him  ·  Gifts for Her  ·  Gifts for Family  ·  Christmas Gifts  ·  Gifts for Grandparents  ·  ✨ Gift Oracle — Find the Perfect Gift

📏 Smart Ring Size Guide — UK Ring Sizes A–Z →

How to Measure Your Ring Size

Wrap a thin strip of paper or soft tape measure around the base of your finger. Mark where it overlaps, then measure the length in millimetres — this is your finger circumference. Match it to the table below. Tip: measure in the evening when fingers are slightly larger for the most accurate fit.

UK Size Circumference (mm) Diameter (mm) US Size
A 37.8 12.0
B 39.1 12.5
C 40.4 12.9
D 41.7 13.3 2
E 43.0 13.7
F 44.2 14.1 3
G 45.5 14.5
H 46.8 14.9 4
I 48.0 15.3
J 49.3 15.7 5
K 50.6 16.1
L 51.9 16.5 6
M 53.1 16.9
N 54.4 17.3 7
O 55.7 17.7
P 57.0 18.1 8
Q 58.3 18.5
R 59.5 18.9 9
S 60.8 19.4
T 62.1 19.8 10
U 63.4 20.2 10½
V 64.6 20.6 11
W 65.9 21.0 11½
X 67.2 21.4 12
Y 68.5 21.8 12½
Z 69.7 22.2 13

💡 Tip: If you’re between sizes, size up for comfort. Smart rings are typically worn on the index or middle finger. Not sure? Ask our Gift Oracle for a personalised recommendation.

Free UK Delivery on all orders — no minimum spend required.