femometer Ring for Fertility and Ovulation Tracking – Size First Sizing Kit – App Auto-Sync – Period & BBT Tracker – Sleep Analysis for Women – Rechargeable & Waterproof Size7
$129.00
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Price: $219.00 - $129.00
(as of Nov 08, 2025 04:30:20 UTC – Details)
Product description
Size Before You Buy
Before purchasing a femometer ring, we recommend purchasing a sizing kit to determine the best size for your finger. It’s the ideal way to find the perfect size.
Find The Right Fit
Femometer Ring sizes are different than standard ring sizes. The Femometer Ring Sizing Kit is the best way to ensure a comfortable and accurate experience.
Purchase The Sizing Kit
Size first, Femometer Ring is available in 4 sizes from 6-9.
Scientific Fertility Preparation
50% more accurate than an oral thermometer and predicts the most fertile days.
Ovulation Tracking
Understand your cycle, take greater control of your health and enjoy a better life
Understand your sleep patterns and stage changes.
Femometer smart ring collects and analyzes your unique sleep data (awake, deep sleep, light sleep)
1 Fertility Tracking
2 Period Management
3 Sleep Monitoring
1 About Femometer App
2 Size Guide
Gen1
Femometer Smart Ring
CYCLE
BBT
SLEEP
Heart Rate/HRV/SpO2
Stress/Steps/Cal
Up to 10 days
Battery Life
Up to 7 days
Charging Stand
Charging Method
Charging Case
CYCLE
BBT
SLEEP
Heart Rate/HRV/SpO2
Stress/Steps/Cal
Up to 10 days
Battery Life
Up to 7 days
Charging Stand
Charging Method
Charging Case
Gen2 
Gen2
Size Before You Buy – Before purchasing a femometer ring, we recommend purchasing a sizing kit to determine the best size for your finger. It’s the ideal way to find the perfect size.
How to Download APP – For Android users, please search and download “Femometer Connect”. For i0S users, please search and download “femometer”.
Make Fertility Tracking Easy – Only need to wear it on your finger to monitor your fertility temperature in real-time, the APP automatically synchronizes the data and generates customized fertility charts, predicts menstruation and ovulation to help you prepare for pregnancy and manage your period more scientifically.
High Accuracy & Comfort – Upgraded multiple temperature sensors, make the temperature measurement is more accurate. Just 2.7mm thickness. The inner ring material is upgraded, the premium ceramic exterior with aluminum core ensures durability.
Professional Sleep Insights – The new version of the sleep algorithm, you will have an in-depth understanding of your sleep condition and the changes in each stage, then get detailed sleep scores and personalized recommendations.
8 reviews for femometer Ring for Fertility and Ovulation Tracking – Size First Sizing Kit – App Auto-Sync – Period & BBT Tracker – Sleep Analysis for Women – Rechargeable & Waterproof Size7
Add a review
$129.00
Lrafl852 –
Great for BBT
I’ve been very happy with this ring! I use it to track BBT to help with cycle interpretation, specifically TTA pregnancy. The app works well, the charge lasts at least a week, and the daily sync of the BBT is quick. The ring fits well and is durable. It also tracks sleep. I find this ring much easier to wear at night than a smartwatch. If you are on the fence about buying it, I say do it. I’ve been nothing but pleased with the app and performance of the ring.
Tashena –
Great for stabilizes your menstrual cycle.
I am a Holistic Business Coach & I was having a little issue with my cycle being too short. I have remedies to use but needed to dial in WHEN to take & use them. This gave me exactly what I needed! It is light comfortable & has lots of additional features!
ENA –
Happy with it
So far so good! I’m happy with the performance so far, and the ring itself fits and feels very nice.
Sb –
Helpful! Smaller feel than ring though
This is really helpful to determine your size. However, I wish I would have known that the ring is more slippery than these sizers are. I was between sizes and ordered up, but it’s borderline too big and I wish I had ordered down instead.
Dylan gremillion –
Sleep and BBT
I absolutely love my Femometer Ring! One of my favorite things about it is how seamlessly it tracks both my sleep and basal body temperature (BBT) without me having to do a thing. No more remembering to take my temperature first thing in the morning—this ring does it all while I sleep.The sleep tracking has also been super insightful. It helps me understand how rest affects my cycle and hormones, which is especially helpful while trying to conceive. The app syncs perfectly and gives me clear, easy-to-read charts. I feel so much more in tune with my body now.If you’re looking for a smart, hassle-free way to track your BBT and sleep for fertility or overall health, I highly recommend the Femometer Ring. It’s seriously become one of my favorite tools!
Erica –
Limited sizing all too small
Really bummed that none of the rings fit. Unfortunately the 9 is a little too small and was hoping that I would be able to order a ring but having only 4 sizes to choose from I guess works for the majority of the female population just not me.
Kelsey M –
Order this before getting ring!
I was going to order this from Femometer website for a few dollars more and probably would have waited longer to receive it. Was so pleasently surprised to find it here on Amazon for 1$ and it got here so fast. I was able to order my ring on Femometer a lot quicker. It definitely helps to get the sizing kit because the sizes are different than normal rings I would say. My fingers are fairly thin and somehow I’m the biggest size available.
sarah –
Great sizing kit!
Honestly worth the money to get the sizing kit. Now I know my Femometer ring will fit appropriately and I won’t have to keep buying and returning to find the right size. Highly reccomend!