Garmin Index S2 Review: The Smart Scale for Garmin Users

Design & Build Quality

The Garmin Index S2 is a functional, well-built scale with Garmin’s characteristic preference for utility over ornament. Available in Black and White, it has a tempered glass platform and a clear white LED display that shows weight, BMI, body fat percentage, and other metrics in sequence. The scale measures 31.4 × 31.4 × 2.7 cm and weighs approximately 1.8 kg.

Build quality is solid. The tempered glass surface is durable and easy to clean. The recessed stainless steel electrodes sit flush with the glass platform. At 180 kg maximum capacity and with a 0.1 kg measurement increment, the hardware is appropriately specified for a range of users.

The design reads as product design rather than interior design — it is clearly a piece of fitness equipment. If the aesthetics of the Withings scales matter to you, the Index S2 is less refined. If you are already in the Garmin ecosystem and functional quality is what counts, the Index S2 delivers.

Setup & Ease of Use

Setup requires a Garmin account and the Garmin Connect app. Pairing the scale over WiFi takes around 10 to 15 minutes using the guided in-app setup. Once connected, measurements sync automatically over WiFi each time you weigh yourself — no phone proximity required.

The Index S2 supports up to 16 user profiles, making it the most accommodating scale in this category for households or shared spaces. Each user creates their own Garmin account and joins the household. Weight-based user recognition assigns readings to the correct profile; manual assignment is available in Connect when needed.

For existing Garmin device users, the scale appears automatically in Garmin Connect alongside wearable data. Body composition trends sit next to activity, heart rate variability, training load, and sleep scores in the same dashboard — a genuinely useful integration that no third-party app can fully replicate.

Measurement Accuracy

The Garmin Index S2 uses foot-to-foot bioelectrical impedance analysis (BIA) at a single frequency — the standard approach for consumer smart scales. It measures weight, BMI, body fat percentage, skeletal muscle mass, bone mass, and body water percentage.

Like all consumer BIA scales, the Index S2 operates with an inherent ±3–5 percentage point margin for body fat percentage compared to DEXA scan. This is a technology limitation, not a product-specific flaw. For monitoring trends over weeks and months — the practical use case for a home scale — the measurement consistency is what matters, and the Index S2 performs well here.

Measurement consistency at the same time of day under comparable hydration conditions is reliable. Users who weigh first thing in the morning before eating or drinking will see stable, comparable readings week over week. Day-to-day variability from hydration, food intake, and time of measurement is the primary source of noise in the data — this is true of all consumer BIA scales.

Features & Insights

The Index S2 measures six metrics:

• Weight — precise to 0.1 kg
• BMI — calculated from weight and profile height
• Body fat percentage — BIA estimation with trend in Connect
• Skeletal muscle mass — BIA estimation
• Bone mass — BIA estimation
• Body water percentage — hydration indicator

These are the same core metrics as the Withings Body+. Where the Garmin Index S2 differs is in how it presents these metrics: not in isolation on the scale app, but integrated with everything else in Garmin Connect.

The Connect integration advantage. A Garmin device user can see their body composition trend alongside their training load, VO2 Max estimate, HRV status, body battery, and sleep quality in one place. A high-intensity training block that drives muscle gain and fat loss will show as compositional change in the scale data, training load spike in Connect, and recovery change in HRV — a multi-signal picture of adaptation that a standalone scale app cannot replicate.

For users without Garmin wearables, the scale data sits in Garmin Connect as a siloed dataset — useful, but without the cross-signal context that makes it genuinely powerful.

App & Software

Garmin Connect is a mature, feature-rich platform. It covers activity tracking, heart rate trends, sleep analysis, training load, VO2 Max, and — with the Index S2 — body composition, all within one app. The scale data dashboard within Connect shows weight and composition trends at daily, weekly, and monthly views.

What works well:

• Body composition trends are clean and clearly presented within Garmin Connect
• Historical data is easily accessible and exportable
• Multi-device sync — scale data alongside watch, HRM, and other Garmin hardware

Where it could improve:

• Garmin Connect’s body composition analysis is less detailed than Withings Health Mate
• The standalone scale experience in Connect feels secondary to the wearable data focus
• Trend overlays (e.g. fat vs muscle mass on one chart) are not as intuitive as Health Mate

Data Privacy

Garmin, a US company, stores user data on servers in the United States. Garmin is GDPR-compliant for European users — data deletion and export requests are available via account settings. Garmin’s privacy practices came under scrutiny following a 2020 ransomware incident that temporarily disrupted services; the company has since invested in security infrastructure. User biometric data is not sold to third parties. Exercise caution with Connect IQ third-party apps, which have separate privacy policies.

Platform Compatibility

The Garmin Index S2’s platform compatibility is defined by Garmin Connect. For users in the Garmin ecosystem, this is the strength — everything lives in one place. For users in other ecosystems (Apple Health power users, Google Fit users), the sync is limited compared to Withings’ direct integration.

Subscription & Pricing

At £119.99, the Garmin Index S2 is priced £20 above the Withings Body+ and £70 below the Withings Body Comp. No subscription is required — Garmin Connect basic is free and includes all the scale data functionality you need.

For Garmin device users, the price reflects the integration value — paying £120 for a scale that plugs natively into an ecosystem you are already using makes sense. For users without Garmin devices, the Withings Body+ at £99.95 is a better standalone value.

See the best smart scales guide for a direct comparison across all reviewed scales.

Final Verdict

The Garmin Index S2 is a well-specified WiFi smart scale with one decisive advantage: native Garmin Connect integration. If you already train with a Garmin device, this scale completes the Garmin health picture — body composition data alongside training load, HRV, sleep quality, and recovery metrics in one place. No other scale offers this integration.

Outside the Garmin ecosystem, it is a competent scale at a fair price, but the Withings Body+ at £99.95 delivers better standalone app experience and more comprehensive Apple Health integration for less money. The Withings Body Comp is the step up for anyone who needs visceral fat or advanced metabolic metrics.

Who Should Buy?

Buy the Garmin Index S2 if:

• You own a Garmin watch, HRM, or GPS device and use Garmin Connect regularly
• You want body composition alongside training and recovery data in one platform
• You have a large household — 16 user profiles is best-in-class
• No subscription cost is important to you

Buy the Withings Body+ instead if:

• You do not use Garmin devices and want the best standalone smart scale under £120
• Apple Health integration depth matters to you

Buy the Withings Body Comp instead if:

• You need visceral fat, vascular age, or nerve health measurements