Smart Ring

Smart Rings UK — Health Monitoring Wearable Technology | Memoriex

Smart rings UK: a discreet way to explore wearable tracking. Compare the listed features of our smart rings, including heart-rate, blood-oxygen and sleep tracking where specified. Functions, sizing, app compatibility and charging requirements vary between models, so use the individual product details to make your choice. Free UK delivery.

Before choosing a smart ring

Start with the sizing information for your chosen model; the general conversion guide below is a reference, not confirmation that every size is stocked. Check the required app, supported phone system, listed tracking functions and charging method. For a gift, confirm the recipient’s size and phone compatibility before ordering.

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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 · Birthday Gifts · Christmas Gifts · Engagement & Anniversary · 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 2½
F 44.2 14.1 3
G 45.5 14.5 3½
H 46.8 14.9 4
I 48.0 15.3 4½
J 49.3 15.7 5
K 50.6 16.1 5½
L 51.9 16.5 6
M 53.1 16.9 6½
N 54.4 17.3 7
O 55.7 17.7 7½
P 57.0 18.1 8
Q 58.3 18.5 8½
R 59.5 18.9 9
S 60.8 19.4 9½
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.

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