Movement and exercise are a key foundation of a healthy life, so the tracking of steps, calories, and workouts is a key feature of fitness- and wellness-oriented smart rings.
But these three metrics require different measurement and analysis. And how they’re presented on smart rings, such as the Ultrahuman Ring AIR and PRO, is different from other wearables such as an Apple Watch.
In this guide, we explain how any smart ring produces those three numbers, and how Ultrahuman Ring tackles accuracy and usefulness.
Key takeaways
- Steps are counted from motion of the finger.
- No wearable measures calories directly – and this figure is an estimate based on a number of factors.
- Heart rate during exercise is read via an optical sensor – but smart rings don’t offer a live readout of your heart rate via a display.
How a ring counts steps
Inside the band sit an accelerometer and a gyroscope, between them tracking motion in six directions. A step has a recognizable signature in that data, a rise and fall with a particular shape and timing, and the algorithm counts those signatures.
The finger works for this because your hand swings with your gait. But if one arm is holding a bag, a phone, or a child, the hand stops swinging, the signature weakens, which can make accuracy difficult. This is also a challenge with smartwatches.
Ultrahuman Ring uses advanced machine learning algorithms to detect signatures of walking within your movement data – and we use accuracy studies to make this as accurate as possible.
We publish these studies on our Ultrahuman Science accuracy pages . Each one names the reference standard, the sample, and the conditions.
| What you’re doing | Ultrahuman accuracy | | A walk on a treadmill | 95.2% | | A walk outdoors, on pavement and kerbs | 91.8% | | A jog or a run | 94.7% | | Walking while carrying something | 89.7% |
How smart rings track calories
The only way to measure energy expenditure properly is indirect calorimetry, which means analyzing the oxygen you consume and the carbon dioxide you produce, usually through a mask in a lab. No ring or watch does anything remotely like this.
A wearable models it in two parts instead. First, it estimates your basal metabolic rate, the energy you would use lying still all day, from your height, weight, age, and sex. Then it adds active energy, based on how much you moved and what your heart rate was doing at the time.
Based on this, the Ultrahuman Ring can estimate calories burned – which can be used as a guide to understand how your movement and exercise support weight goals.
How smart rings track workouts
By and large, smart rings such as the Ultrahuman Ring are better used to understand the impact of workouts on sleep and recovery, and how prepared you are for your next session.
Athletes are more likely to wear their smart ring to bed in order to get all-night biomarker insights than they are to wear a chunky sports watch. Runners, for example, are unlikely to trade in the real-time pace, GPS-based distance data from a sports watch for a smart ring without a screen.
However, smart rings can still track workouts natively – so you can see the impact of your session or class on calorie and movement data.
Just like watches, heart rate is read optically. LEDs shine light into the skin, and a sensor measures how much comes back, with blood volume changing that reflection on every beat.
In practice, a ring will put you in the right training zone and track the shape of a session. It is not a substitute for a chest strap if you need beat-level precision.
Ultrahuman also goes one step further. The Emerald Update added the ability for the Ultrahuman app to read heart rate data from any fitness wearable – so you don’t need to wear your smart ring to get the credit for your workout. For some workouts, such as weights, you can leave your smart ring in the locker and still get full data accuracy.
| If you care most about | Smart ring | Wrist tracker | | Live pace, maps and splits | Limited | Better suited | | Workout detail on a screen mid-session | Limited | Better suited | | Wearing it through the night | Better suited | Varies | | Sleep and recovery context for your training | Better suited | Varies | | Something screen-free you can forget about | Better suited | Less suited |
Why sleep is the foundation of health tracking
A hard session does not lower your Recovery score directly, which surprises people. The effect arrives overnight. Training suppresses HRV and raises your resting heart rate during the following night’s sleep, and that is what the next morning’s score reflects.
A dip after a genuinely hard session is the expected physiological response, not a sign something has gone wrong. The session itself feeds your Movement Index, through the workout-frequency part of the score.
This is the benefit of a device you keep on overnight rather than one you put on to train.
Frequently asked questions
How does a smart ring count steps? Through an accelerometer and gyroscope that detect the motion signature of a step. The Ultrahuman Ring lands within 95.2% of a hand count on a treadmill walk and 91.8% on an outdoor one.
Are smart ring calorie estimates accurate? They are estimates on every wearable. Energy expenditure can only be measured properly by analyzing your breath in a lab, so a tracker models it from your resting rate plus movement and heart rate. Compare days rather than chasing a total.
Can a smart ring track workouts properly? It will track heart rate, training zones, duration, and estimated calories across more than 100 workout types, and start a session on its own when it detects movement. It will not give you pace, distance or route without your phone, and it has no screen.
Can I use a smart ring alongside a watch or chest strap? Yes. Choose the other device when a session starts, or connect your apps under Connect Other Apps so completed workouts arrive automatically with their heart rate already attached.
Disclaimer: The contents of this article are for general information and educational purposes only. It neither provides any medical advice nor intends to substitute professional medical opinion on the treatment, diagnosis, prevention, or alleviation of any disease, disorder, or disability. Always consult with your doctor or qualified healthcare professional about your health condition and/or concerns and before undertaking a new healthcare regimen, including making any dietary or lifestyle changes.
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