Withings Omnia AI Smart Mirror Body Scanning CES

The Withings Omnia is a full-length smart mirror with AI-driven body scanning that was unveiled at CES 2025, and it is designed to give a detailed, multi-system health snapshot in about 90 seconds. You step onto its integrated scale, hold the handles, and it measures body composition, cardiovascular metrics, and nerve activity, then shows the results on the mirror itself. This article explains what the Omnia actually does, how it works, what it costs, and how it compares to other body scanners.

Formula

The calculator above computes two common body-composition indices from the data the Omnia would collect. The first is Body Mass Index (BMI), defined as weight in kilograms divided by the square of height in meters:

BMI = w / (h/100)²

where w is body weight in kg and h is height in cm. The second is the Fat-Free Mass Index (FFMI), which estimates lean mass by assuming a typical body-fat percentage (here 20% for the default example, but you can adjust the formula if you know your actual fat percentage):

FFMI = (w × (1 – fat%)) / (h/100)²

In the calculator, the fat% is fixed at 20% for simplicity. Both indices are expressed in kg/m². The Omnia itself uses bioelectrical impedance and other sensors to measure actual fat and lean mass, so these formulas are only a quick approximation for context.

Worked Example

Using the default values: weight = 70 kg, height = 170 cm, age = 35, sex = male.

1. Convert height to meters: 170 cm = 1.70 m.
2. Square the height: 1.70 × 1.70 = 2.89 m².
3. Calculate BMI: 70 / 2.89 = 24.2 kg/m².
4. Estimate fat-free mass: 70 × 0.8 = 56 kg (assuming 20% fat).
5. Calculate FFMI: 56 / 2.89 = 19.4 kg/m².

The calculator shows BMI = 24.2 and FFMI = 19.4, matching the steps above.

What Is the Withings Omnia?

The Omnia is a concept-turned-product that Withings first showed as a prototype in 2022 and officially announced at CES 2025. It is a full-length mirror (roughly 40 inches wide and 60 inches tall) with a built-in scale base. When you step on it and grasp the two side handles, the mirror runs a multi-frequency bioelectrical impedance analysis (BIA) scan. The mirror’s display then shows a 3D avatar of your body with color-coded metrics for fat, muscle, water, and bone, plus cardiovascular readings like pulse wave velocity and heart rate. It also includes a single-lead ECG and a nerve activity measurement via the handles.

The Omnia is not yet available for purchase; Withings has said it will launch in the US first, with a price around $600–$700, but exact dates and final pricing are still unconfirmed. It is designed to be a home health station rather than a portable device.

How Does the Body Scanning Work?

The Omnia uses several sensing technologies simultaneously:

• Bioelectrical impedance analysis (BIA): Low-level electrical currents pass through the body via the scale and handles. Different tissues (fat, muscle, water) resist the current differently, allowing the mirror to estimate body composition.
• Multi-frequency BIA: Unlike simple scales that use one frequency, the Omnia uses multiple frequencies to separate intracellular and extracellular water, giving more accurate fat and muscle readings.
• ECG (electrocardiogram): The handles have electrodes that record the heart’s electrical activity, which can detect atrial fibrillation and other rhythm issues.
• Pulse wave velocity (PWV): By measuring the time it takes for the pulse to travel between the feet and the hands, the Omnia estimates arterial stiffness, a marker of cardiovascular health.
• Nerve activity: The handles also measure sympathetic nerve activity, which relates to stress and recovery.

All data is processed by the mirror’s onboard AI, which creates a 3D model and trends over time. The mirror can also display video calls with health coaches, but that is a secondary feature.

How to Choose a Body Scanner: Omnia vs. Alternatives

If you are considering the Omnia, you should weigh it against other options:

• Smart scales (e.g., Withings Body+ or Body Scan): These are cheaper ($50–$200) and measure weight, BMI, and basic body composition. They lack ECG, PWV, and nerve activity, but they are portable and sync to the same app.
• Handheld body fat analyzers: These are less common and less accurate for lower-body fat.
• DEXA scans (in-clinic): The gold standard for body composition, but expensive ($100–$300 per scan) and not for home use.
• Other smart mirrors (e.g., Mirror, FitMirror): These focus on fitness classes, not body scanning. The Omnia is unique in combining mirror display with medical-grade sensors.

Choose the Omnia if you want a comprehensive home health station and are willing to pay a premium. Choose a smart scale if you only need weight and basic body fat trends.

Common Problems and Limitations

As with any BIA device, the Omnia’s accuracy depends on hydration, food intake, and time of day. Common issues include:

• Hydration swings: Drinking a large glass of water can change body fat readings by several percent. Always scan at the same time of day, ideally in the morning before eating.
• Foot and hand placement: If you don’t stand exactly on the electrodes or hold the handles firmly, readings can be off.
• Pacemaker or implant caution: BIA devices may interfere with implanted electronic devices. Consult your doctor if you have a pacemaker.
• Not a medical device: Despite the ECG and PWV, the Omnia is not FDA-cleared for diagnosis. It is a wellness tool, not a replacement for professional medical testing.

Cost and Availability

As of early 2025, the Omnia is not yet on sale. Withings announced a target price of around $600–$700, but this could change. The company has a history of launching products first in the US, then expanding to Europe and other regions. No official release date has been confirmed. You can sign up on Withings’ website for updates.

Safety and Accuracy Considerations

BIA is generally safe for healthy individuals, but there are important caveats:

• Do not use if you are pregnant, have a pacemaker or other implanted device, or have epilepsy (the ECG might trigger concerns).
• The electrical currents are extremely low and not felt, but they are not recommended for people with certain medical conditions.
• Accuracy varies: BIA has an error of roughly ±3-5% for body fat percentage compared to DEXA. The Omnia’s multi-frequency approach may improve this, but it is not perfect.
• Always interpret trends over weeks, not single readings.

Frequently Asked Questions

Is the Withings Omnia available for purchase?
No, as of early 2025 it is not yet on sale. Withings has announced it for the US market with a price around $600–$700, but no release date has been confirmed.

What does the Omnia measure that a regular smart scale doesn’t?
It adds an ECG, pulse wave velocity, nerve activity, and a 3D body avatar. Regular scales only measure weight and basic body composition.

Can the Omnia detect heart problems?
The ECG can detect atrial fibrillation, and the pulse wave velocity indicates arterial stiffness. However, it is not a diagnostic device and should not replace regular check-ups.

How accurate is the body fat measurement?
BIA is generally within 3-5% of DEXA scans. The Omnia’s multi-frequency technology may be more accurate than single-frequency scales, but hydration and food intake still affect results.

Is it safe for everyone?
No. People with pacemakers or other implanted devices, pregnant women, and those with certain medical conditions should avoid BIA devices unless cleared by a doctor.

Will the Omnia work with the Withings app?
Yes, it will sync to the Withings Health Mate app, which already supports other Withings devices, so you can see trends over time.

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in t | Scan time | min | 1.5 | 0
in w | Body weight | kg | 70 | 0
in h | Height | cm | 170 | 0
in a | Age | years | 35 | 0
in s | Sex (male=1, female=2) | - | 1 | 0
out bmi | Body Mass Index | kg/m² | w / ((h/100)^2) | 1
out ffmi | Fat-Free Mass Index | kg/m² | (w * 0.8) / ((h/100)^2) | 1