Bathroom Scale

Many modern smart weight scales use bioelectrical impedance analysis (BIA): a very low-amplitude electrical current is sent through your body via the scale’s sensors, and the resistance it encounters gives an estimate of body composition (fat, muscle, water). Because fat, muscle and other tissues conduct the current differently, the bathroom scale’s algorithm translates that into body-fat percentage. It’s most accurate for tracking trends over time rather than providing a medical-grade reading.

Digital bathroom scales are generally more reliable than old mechanical ones because they offer finer resolution and remove many moving parts. That said, accuracy depends on proper use — placing the scale on a flat, hard floor, weighing at the same time of day, with consistent conditions. Smart scales that measure additional metrics will have some margin of error — so they are excellent for tracking progress and trends rather than absolute precision.

High-quality digital bathroom scales often detect small weight changes (e.g., as little as 0.1 lb or ~50 g) if used correctly. For example, eufy Smart Scale P3 claims precision down to 0.1 lb (≈50 g). However, real-world factors (hydration, food intake, recent exercise) can cause day-to-day fluctuations much larger than these small changes. For best use, focus on multi-day averages rather than one-off tiny shifts.

eufy's bathroom scales, when used under normal conditions (flat surface, moderate weight, consistent care), can last many years. Battery-powered models will last until the batteries need replacement, which might mean months to years depending on usage. With proper care (avoiding water damage, keeping it clean, not overloading beyond weight capacity), you should easily get 3-5 years or more reliable use.

No, placing a digital bathroom scale on carpet or other soft, uneven surface will give inaccurate readings because the sensors rely on a firm, flat surface to register weight correctly. For best accuracy and consistency, use the scale on tile, wood or concrete floor, and avoid rugs or piled carpet underneath.

Technically, yes. A bathroom scale will show the weight of any object placed on it within its capacity. However, there are two caveats: (1) most bathroom scales are designed for human use and may not be as stable when weighing awkward or asymmetrical objects like a suitcase, (2) the accuracy for large objects may vary, especially if the object doesn’t sit evenly on the platform. It’s safer to use a dedicated luggage scale for travel to ensure you meet airline limits

To calibrate most digital scales: place the scale on a flat, hard surface; step on briefly to wake it, then step off and wait until it shows “0.0” or the zero reading in your unit. If the scale has a calibration button or sequence, follow that. For more reliable results you might also weigh a known reference weight and compare once in a while.