RIng Size Guide

Ring Sizing Guide

Find your perfect fit with our comprehensive sizing guide

Getting the right ring size is crucial for comfort and security. Our comprehensive guide will help you find the perfect fit, whether you're shopping for yourself or planning a surprise proposal.

Ring Size Conversion Charts

UK Size	Diameter (mm)	Circumference (mm)
A	-	37.8
B	-	39.1
C	-	40.4
D	-	41.7
E	-	42.9
F	15.3	44.2
G	15.7	45.5
H	16.1	46.8
I	16.5	48.0
J	16.9	48.7
K	17.3	50.0
L	17.7	51.2
M	18.1	52.5

UK Size	Diameter (mm)	Circumference (mm)
N	18.5	53.8
O	18.9	55.1
P	19.3	56.3
Q	19.7	57.6
R	20.1	58.9
S	20.4	60.2
T	20.8	61.4
U	-	62.7
V	-	64.0
W	-	65.3
X	-	66.6
Y	-	67.8
Z	-	68.5

UK Size	US Size	Diameter (mm)
F	3	15.3
G	3.5	15.7
H	4	16.1
I	4.5	16.5
J	5	16.9
K	5.5	17.3
L	6	17.7
M	6.5	18.1
N	7	18.5
O	7.5	18.9
P	8	19.3
Q	8.5	19.7
R	9	20.1
S	9.5	20.4
T	10	20.8

UK Size	EU Size	Diameter (mm)
F	48	15.3
G	49	15.7
H	51	16.1
I	52	16.5
J	53	16.9
K	54	17.3
L	56	17.7
M	57	18.1
N	58	18.5
O	59	18.9
P	61	19.3
Q	62	19.7
R	63	20.1
S	65	20.4
T	66	20.8

How to Measure UK Ring Size at Home

String Method

Wrap a piece of string around your finger where you'd wear the ring. Mark where the string overlaps, then measure the length with a ruler.

Paper Strip Method

Cut a thin strip of paper, wrap it around your finger, mark the overlap, and measure the length in millimeters.

Existing Ring Method

Place an existing ring that fits well on a ruler and measure the internal diameter in millimeters.

Best Time to Measure

Measure your finger at the end of the day when it's at its largest, and ensure your hands are at room temperature.

Downloadable Ring Sizer

Printable Ring Sizer

Print at 100% scale for accurate measurements

Get Your Free Ring Sizer

Download and print our professional ring sizer tool. Make sure to print at 100% scale (no scaling) for accurate measurements.

Download and print the PDF at 100% scale
Cut out the ring sizer carefully
Insert the pointed end through the slot
Slide onto your finger and adjust for comfort
Read the size where the sizer overlaps

Ring Size Calculator

Calculate your ring size using measurements from home

Finger Circumference (mm) Measure around your finger with string or paper

Ring Diameter (mm) Measure across an existing ring that fits

Known Ring SizeConvert to other international sizes

Helpful Ring Sizing Tips

Temperature Matters

Your fingers are smaller when cold and larger when warm. Measure at room temperature for best results.

Time of Day

Fingers are typically largest in the evening. Measure later in the day for a more comfortable fit.

Knuckle Consideration

The ring must fit over your knuckle. If your knuckle is much larger, consider a slightly bigger size.

Wide Bands

Wide bands (over 6 mm) typically need to be sized up by half a size for comfort.

Dominant Hand

Your dominant hand fingers are typically slightly larger. Consider this when choosing your ring finger.

Multiple Measurements

Take measurements multiple times and at different times of day to ensure consistency.

Find Their Size In Secret

Planning a surprise? Here are clever ways to determine their ring size without spoiling the surprise.

Borrow a Ring

Secretly borrow a ring they wear on their ring finger. Trace the inside on paper or take it to a jeweler for sizing.

Ask Friends/Family

Discreetly ask their close friends, family members, or siblings if they know their ring size.

Shopping Together

Casually browse jewelry stores together and suggest trying on rings “just for fun” to gauge their size.

Photo Method

Take a photo of their hand next to a coin or ruler for scale, then use online ring size calculators.

String While Sleeping

Carefully wrap a string around their finger while they’re sleeping (only if you’re sure they won’t wake up!).

Gift Card Approach

Give them a jewelry store gift card and go together to “help them choose” – perfect opportunity to get sized.

Ring Sizing FAQs

If you're between sizes, it's generally better to go with the larger size. You can always have a ring sized down, but sizing up is more difficult and sometimes impossible depending on the ring design.

Ring resizing typically costs between £30-£80 depending on the material, complexity, and how many sizes need to be adjusted. Simple gold bands are usually less expensive than rings with stones or intricate designs.

Not all rings can be resized. Eternity bands, rings with stones all around, tungsten, titanium, and some alternative metal rings cannot be resized. It's best to get the size right from the start for these types.

Printable ring sizers can be quite accurate if printed at exactly 100% scale and used correctly. However, the most accurate method is still professional sizing at a jewelry store using proper ring sizers.

Yes, ring sizing systems vary by country. The UK uses letters (F, G, H, etc.), the US uses numbers (3, 4, 5, etc.), and Europe uses millimeter measurements. Always check which system is being used when ordering.

Get professionally sized for expensive rings, engagement rings, or if you're unsure about your measurements. Many jewelry stores offer free sizing services, and it's worth the peace of mind for important purchases.

Still unsure? Ask one of
our friendly experts

If you need any more help or assistance, please call into any of our Watcho stores or contact our Customer Services team who will be happy to advise you. Call us free on +44 1908 983 500. Our phone lines are open Monday to Friday 9 am – 5 pm.

You can also use our live chat service where we’ll be happy to help with all your questions.

We are also happy to offer a free 30-day returns policy for refunds and exchanges, in case you need to change your ring for another size or style providing that the ring is unworn.