Are smart bathroom scales accurate for body fat percentage?

The consensus across the fitness communities and tech reviewers we read is that bioimpedance body-fat readings should be treated as rough trend data, not precise measurements. Multiple specialist-subreddit threads report readings that differ significantly from DEXA scans, and at least one tech reviewer found body-fat numbers skewed in testing. If you want body composition, use a smart scale to track direction over time on the same device rather than as an absolute number.