A portion of every order is donated to Women’s Health Research
Select Ring Size
You will also need a bank card for a quick 10-second check.
Scan the code with your phone and tap "Find My Ring Size". A phone shows the circle at real size.
Your screen is smaller than a bank card. Please use the size chart.
Take off the phone case first.
Between two sizes? Take the smaller one.
Please reset the zoom (pinch out) first.
The circle is shown at real size.
Your ring size is
Free returns for 100 days, no questions asked.
Wrap a strip of paper around your finger. Mark where it meets. Measure that length in millimetres. Find it in the chart.
| Around (mm) | US | UK | EU | JP |
|---|---|---|---|---|
| 49 | 5 | J½ | 49 | 9 |
| 52 | 6 | L½ | 52 | 12 |
| 54 | 7 | N½ | 54 | 14 |
| 57 | 8 | P½ | 57 | 16 |
| 60 | 9 | R½ | 60 | 19 |
| 62 | 10 | T½ | 62 | 21 |
| 65 | 11 | V½ | 65 | 24 |
| 67 | 12 | X½ | 67 | 26 |
| 70 | 13 | Z+1 | 70 | 29 |
| 72 | 14 | Z+3 | 72 | 31 |
Between two sizes? Choose the smaller one.
Take a ring that fits the right finger. Measure the space inside it, from edge to edge, in millimetres. Find that number in the chart.
| Inside (mm) | US | UK | EU | JP |
|---|---|---|---|---|
| 15.7 | 5 | J½ | 49 | 9 |
| 16.5 | 6 | L½ | 52 | 12 |
| 17.3 | 7 | N½ | 54 | 14 |
| 18.1 | 8 | P½ | 57 | 16 |
| 18.9 | 9 | R½ | 60 | 19 |
| 19.8 | 10 | T½ | 62 | 21 |
| 20.6 | 11 | V½ | 65 | 24 |
| 21.4 | 12 | X½ | 67 | 26 |
| 22.2 | 13 | Z+1 | 70 | 29 |
| 23.0 | 14 | Z+3 | 72 | 31 |
Between two sizes? Choose the smaller one.
We recommend selecting your true ring size. If you're between sizes, choose the smaller size.
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Award-winning smart ring that helps you understand your body
Tracks 50+ health signals and turns them into clear recommendations for better sleep, recovery, stress and everyday wellness.
Designed with health experts to improve your everyday life.
What it does: tracks sleep, heart rate, HRV, blood oxygen, stress, readiness, steps, calories and your cycle, day and night, and turns it into daily recommendations.
Materials: titanium shell, hypoallergenic inner, scratch-resistant finish.
Battery: up to 7 days, full charge in 60 minutes.
Water resistance: IP68. Shower, sweat and swim in it. Not for the sauna or diving.
In the box: ring, charger, USB-C cable, quick start guide.
App: free for life on iOS and Android, available in every language.
Free worldwide shipping on every order.
USA 5-8 business days
Canada 5-10 business days
United Kingdom 4-6 business days
Europe 5-8 business days
Australia 6-10 business days
Rest of the world 7-14 business days.
100-day money-back guarantee.
If you order the wrong size or simply don't like it, just contact us for a full refund.
help@noomay.com
A portion of every order is donated to Women’s Health Research
Hear it from 200,000+ women who finally understand their bodies
I honestly thought I was just always tired. After a few weeks with Noomay, I started seeing how things like late coffee and stress were affecting my sleep. Now I wake up before my alarm most days. I just needed to understand my body better.
I’ve been wearing my Noomay ring on walks with my friends and I love seeing how much I actually move. We’ll walk for hours just talking and I always check my steps after. It’s honestly made me want to walk more.
I’m a nurse and work 12-hour shifts, so I always thought feeling stressed and exhausted was just part of the job. Noomay made me realize how much skipping meals and not taking breaks was affecting me. Now I actually pay attention to my stress and take a few minutes for myself when I need it.
I have really sensitive skin, so most rings bother me after a while. I’ve been wearing this one for three weeks, day and night, and it’s still super comfortable. No marks, no irritation, and the battery lasts forever.
I always blamed my sleep when I felt tired, but Noomay made me realize my stress was part of it too. On stressful days, I noticed my sleep was much worse. The sleep assistant helped me get into a better routine, and I’ve been sleeping so much better since.
Feeling better starts by knowing your body
Sleep and Rest
Wellness and Longevity
Activity and Fitness
Heart Health
Women's Health
Stress
Better nights make better days. Noomay reads your sleep stages, heart rate and recovery, then tells you what to change so you wake up ready.
Sleep was the missing piece. Now I know exactly why I feel the way I feel.
Your daily readiness score turns 50+ health signals into one clear answer: push today, or recover. Small adjustments, compounding results.
It's like having a health coach who actually knows me.
Steps, distance, calories and workouts, tracked automatically — with recommendations that fit your real life, not an athlete's.
I stopped guessing and started seeing progress.
Resting heart rate, heart-rate variability and blood oxygen, day and night. Spot the trends that matter before they become problems.
My resting heart rate dropped 6 beats in two months. I can see it.
Temperature trends and cycle insights help you plan your energy, training and rest around your body — not against it.
For the first time my cycle isn't a surprise.
See how stress builds through your day, get a nudge to breathe or move, and watch your recovery improve week after week.
I finally understand my bad days — and how to turn them around.
Noomay translates your body's data into simple actions that make you feel better every single day.
91%
of customers reported falling asleep faster and waking up more rested within a month.
Based on a four-week independent customer panel
92%
of customers said they finally understood what drains their energy and how to recover from it.
Based on a four-week independent customer panel
88%
of customers reached activity goals they had given up on, with recommendations that fit their day.
Based on a four-week independent customer panel
97%
of customers reported more stable energy and focus through the day after one month.
Based on a four-week independent customer panel
The ring that helps you understand your body.
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Smartwatches
Free Worldwide Shipping
Free App For Life
2 Year Warranty
Funding Health Research
100-Day Money Back Guarantee
We've got answers
Everything that matters, day and night: sleep (deep, light, REM), heart rate and HRV, blood oxygen, skin temperature, stress and readiness, steps, calories and your cycle. Then the free app turns it into simple recommendations so you know what to do today to feel better.
Never. The Noomay app is free for life on iOS and Android, in every language. Every score, every recommendation and every update is included with your ring. You pay once and your data stays yours.
We ship worldwide, for free. Orders leave our warehouse within 1-2 business days and arrive in 5-8 business days in the USA and Europe. See every delivery time in our shipping policy and track your parcel any time on the tracking page.
Up to 7 days on one charge — and a full recharge takes 60 minutes.
Yes. Noomay tracks your temperature and heart signals overnight and shows how your cycle phase shapes your sleep, energy and stress.
You can contact us through our contact page! We will be happy to assist you.
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@livmarlowTrusted by 200,000+ customers worldwide
