Samsung Galaxy Ring Size Chart & Fit Guide
An independent, comprehensive sizing reference for the Samsung Galaxy Ring. Compare sizes 5 through 13 in millimeters, understand how interior sensor bumps affect fit, and learn how to use the sizing kit.
How Does Samsung Galaxy Ring Sizing Work?
Samsung Galaxy Ring size chart (Sizes 5–13)
Official sizing progression mapped to millimeter diameter, circumference, and international size standards.
| Samsung Size | US / Canada | UK / Australia | EU / ISO | Inside Diameter (mm) | Inside Circ. (mm) | Fit & Sensor Notes |
|---|---|---|---|---|---|---|
| Samsung SizeSize 5 | US / Canada5.0 | UK / AustraliaJ½ | EU / ISO49.5 | Inside Diameter (mm)15.70 mm | Inside Circ. (mm)49.32 mm | Fit & Sensor NotesSmallest available size. Fits snugger than a standard size 5 due to sensor bumps. Size up to 6 if wearing 5.5. |
| Samsung SizeSize 6 | US / Canada6.0 | UK / AustraliaL½ | EU / ISO52.0 | Inside Diameter (mm)16.51 mm | Inside Circ. (mm)51.87 mm | Fit & Sensor NotesStandard size 6. If your knuckle resists or you wear 6.25–6.5 in flat bands, size up to 7. |
| Samsung SizeSize 7 | US / Canada7.0 | UK / AustraliaN½ | EU / ISO54.5 | Inside Diameter (mm)17.32 mm | Inside Circ. (mm)54.41 mm | Fit & Sensor NotesMost popular women’s index/middle finger size. Recommended size up to 8 if you wear 7.5. |
| Samsung SizeSize 8 | US / Canada8.0 | UK / AustraliaP½ | EU / ISO57.0 | Inside Diameter (mm)18.14 mm | Inside Circ. (mm)56.99 mm | Fit & Sensor NotesCommon crossover size for women’s index or men’s ring finger. Size up to 9 for 8.5. |
| Samsung SizeSize 9 | US / Canada9.0 | UK / AustraliaR½ | EU / ISO59.5 | Inside Diameter (mm)18.95 mm | Inside Circ. (mm)59.53 mm | Fit & Sensor NotesCommon men’s ring finger or women’s thumb size. If wearing 9.5, size up to 10. |
| Samsung SizeSize 10 | US / Canada10.0 | UK / AustraliaT½ | EU / ISO62.0 | Inside Diameter (mm)19.76 mm | Inside Circ. (mm)62.08 mm | Fit & Sensor NotesMost popular men’s index and middle finger size. Provides stable sensor contact. |
| Samsung SizeSize 11 | US / Canada11.0 | UK / AustraliaV½ | EU / ISO64.5 | Inside Diameter (mm)20.57 mm | Inside Circ. (mm)64.62 mm | Fit & Sensor NotesLarger men’s index or middle finger size. Size up to 12 if you wear US 11.5. |
| Samsung SizeSize 12 | US / Canada12.0 | UK / AustraliaX½ | EU / ISO67.0 | Inside Diameter (mm)21.39 mm | Inside Circ. (mm)67.20 mm | Fit & Sensor NotesLarge men’s index or middle finger size. Size up to 13 if between sizes 12 and 12.5. |
| Samsung SizeSize 13 | US / Canada13.0 | UK / AustraliaZ½ | EU / ISO69.5 | Inside Diameter (mm)22.20 mm | Inside Circ. (mm)69.74 mm | Fit & Sensor NotesLargest produced Galaxy Ring size. No sizes 14 or above exist. Best for circumferences up to ~69.7 mm. |
Source and verification
Table source: Samsung Electronics — Galaxy Ring Sizing & Fit Guide. Last reviewed . Check the retailer's current size guide before ordering.
Galaxy Ring fit analysis: Sensor bumps and band geometry
Why a smart ring fits differently than a traditional gold or platinum wedding band.
Interior Sensor Bumps
The inner surface of the Galaxy Ring is lined with protective epoxy resin housing three raised sensor domes: two photoplethysmography (PPG) optical sensors for continuous heart rate, heart rate variability (HRV), and blood oxygen monitoring, alongside a skin temperature sensor. These three sensor nodes project slightly into the inner cavity. As a result, you feel slight localized pressure points that ensure constant skin contact without sliding.
7.0 mm Band Width & Thickness
The Galaxy Ring has a uniform 7.0 mm width and a 2.6 mm thickness. Standard jewelry bands for women average 2 to 3 mm in width, and men’s bands average 4 to 6 mm. Because wider rings displace more skin and trap minor moisture underneath, they grip the finger more firmly than narrow rings. This wide-profile design is a key reason sizing up by a half size is so effective.
Diurnal Finger Swelling
Human fingers naturally change volume by up to half a ring size between waking and sleeping. Warm ambient temperatures, workouts, sodium intake, and nighttime circulation cause fingers to expand, whereas cold weather causes them to constrict. A smart ring worn 24/7 must remain comfortable when your fingers are at their maximum morning volume.
Concave Titanium Exterior
Samsung utilizes a Grade 5 titanium outer shell featuring a distinctive concave curvature. This gentle inward slope directs contact away from the center of the ring, helping prevent scratch marks from weights, door handles, and daily objects. Despite housing a battery and wireless charging coil, the ring weighs just 2.3 to 3.0 grams.
Samsung Galaxy Ring sizing kit workflow
Step-by-step guidance for testing plastic sizing mock-ups before committing to an order.
Order or acquire the official sizing kit
When ordering on Samsung.com, select "I don't know my size" to receive the sizing kit first. The kit contains 9 plastic sample rings labeled 5 through 13. These sample rings replicate the exact internal diameter, thickness, and sensor bump positions of the final titanium ring.
Align the sensor orientation notch toward your palm
Look closely at the sample ring: it has a subtle indicator mark on the outer bottom edge. When putting the ring on, ensure this indicator faces the palm side of your hand. This positions the sensor bumps directly under your finger pad, where arterial blood flow is most readily detected.
Wear the sample ring for at least 24 continuous hours
Samsung's support guidelines explicitly recommend wearing the sizing sample for a full 24-hour cycle. Do not simply put it on for 5 minutes. You must wear it during sleep, morning routines, typing, and light daily work. If you wake up with swelling and the ring feels uncomfortably tight, try the next size up.
Perform the grip and knuckle check
Make a tight fist, hold a steering wheel, and carry a shopping bag. The ring should feel secure without pinching your skin. When removing the ring, it should slide over your knuckle with mild resistance, but should never require soap or excessive force. If the ring spins freely around your finger when relaxed, it is too large.
Which finger should you wear the Galaxy Ring on?
Optimal finger placement based on biometric sensor design and daily ergonomics.
Index Finger (Pointer)
Samsung's primary recommendation. The index finger provides the best sensor-to-skin surface contact and high arterial blood volume, maximizing the signal-to-noise ratio for heart rate tracking and sleep staging.
Middle Finger
The most balanced placement for daily comfort and symmetrical hand feel. Offers robust sensor contact while keeping your index finger completely unobstructed for detailed tactile work.
Ring Finger
Ideal for users replacing or complementing a traditional wedding band. Fully supported by Samsung's algorithms, though finger volume is often smaller, typically requiring a smaller size.
Convert your size & measure your finger
Switch between international ring sizing systems or measure your finger at home.
Ring Size Calculator
Enter your finger diameter or circumference in millimeters or inches to discover your exact US, UK, and EU size equivalents.
Printable Ring Sizer (PDF)
Download our calibrated 100% actual-scale vector PDF with credit card verification, cut-out ruler strip, and 21 ring placement circles.
On-Screen Screen Sizer
Calibrate your computer or smartphone screen with a standard card to measure an existing ring’s inner diameter directly on your display.
Frequently asked questions
How do Samsung Galaxy Ring sizes compare to standard US ring sizes?
The Samsung Galaxy Ring follows nominal US ring sizing (whole sizes 5 through 13). However, because the inner surface features three raised optical and temperature sensor bumps, it fits slightly snugger than a flat, comfort-fit metal band of the identical nominal size. If you normally wear a half-size or are between two sizes, sizing up is almost always recommended.
Does Samsung offer half sizes or sizes above 13 for the Galaxy Ring?
No. The Galaxy Ring is exclusively manufactured in 9 whole sizes: US 5, 6, 7, 8, 9, 10, 11, 12, and 13. There are currently no half sizes (e.g. 7.5, 8.5) and no sizes below 5 or above 13. If your measurement falls on a half-size, choose the next whole size up.
Which finger is best for wearing the Samsung Galaxy Ring?
Samsung officially recommends wearing the Galaxy Ring on your index finger (pointer finger) for optimal biometric sensor contact and tracking accuracy. The middle finger and ring finger are also supported alternatives. Wearing it on the thumb or pinky is not recommended due to reduced sensor stability and irregular knuckle geometry.
Why does Samsung require wearing the sizing kit sample for 24 hours?
Your finger circumference fluctuates throughout the day due to temperature, hydration, physical exertion, and overnight fluid retention. Wearing the plastic sizing kit band for a full 24 hours—including during sleep and everyday hand gestures—ensures the ring remains comfortable when your fingers swell in the morning and will not spin or pinch.
Can the Samsung Galaxy Ring be resized by a jeweler?
No. Unlike traditional gold, silver, or platinum rings, the Galaxy Ring contains a curved rechargeable battery, microprocessors, and sensitive optical sensors sealed inside titanium and epoxy resin. Attempting to cut, stretch, or reshape the band will permanently destroy the electronics and void the manufacturer warranty.
How should the orientation indicator mark on the Galaxy Ring face?
The Galaxy Ring has a subtle indentation mark on the outer edge of the band. This indicator should always face toward your palm. Aligning this notch ensures the three sensor nodes rest on the fleshy underside of your finger, which is essential for accurate pulse, blood oxygen, and skin temperature readings.
What are the physical dimensions and weight of the Samsung Galaxy Ring?
The Galaxy Ring measures 7.0 mm in width and 2.6 mm in thickness across all sizes. It is encased in a Grade 5 titanium exterior shell with a concave outer profile that resists surface scratches. It weighs between 2.3 grams (size 5) and 3.0 grams (size 13), making it exceptionally lightweight for 24/7 continuous wear.
Trademark Disclaimer
Samsung and Galaxy Ring are registered trademarks of Samsung Electronics Co., Ltd. RingSizeConvert.com is an independent sizing reference and is not affiliated with, endorsed by, or sponsored by Samsung Electronics. All sizing specifications and product references are provided for educational and consumer informational purposes.