These are the best smart scales to buy in every category, from Withings Body and Garmin Index S2 to Renpho Elis 1.

Smart scales track changes in your muscle mass, body fat percentage and other health metrics — but how do they work?

The Withings Body Comp Smart Scale is on sale for $169.95, an over 25% markdown from its usual $229.95 for Prime Day. This ...

With support for 13 trackable body composition and health metrics, plus modes for weighing babies, luggage, and pets, the affordable Wyze Scale X is the best smart scale for most people. $39.98 ...

A smart scale is a good investment if you want to track your weight, body composition, and progress over time. They're also great for people who're losing weight or pursuing fitness goals.

Best for Comprehensive Body Composition Analysis: RENPHO Smart Scale. Key specs: 400-pound weight limit, 0.2-pound readout accuracy, glass material, Bluetooth connectivity, ...

If you just want to measure your body weight, smart scales work just like any regular scale. But that's where the similarities end. Depending on the brand, smart scales can estimate your body fat ...

A cornerstone of the Body Scan smart scales is the multi-frequency Bioelectrical Impedance Analysis (BIA) technology. This technology sends a safe, undetectable current through the body to provide ...

Smart scales use bioelectrical impedance to measure your body composition. The user stands on the scale with bare feet, and the scale sends a mild electrical current up through their body.

The Withings Body smart scale is a well-designed and decent bit of kit, but if you want body composition stats, we recommend the brand’s Body+ or Body Cardio scales instead.

Smart scales track changes in your muscle mass, body fat percentage and other health metrics — but how do they work?