Track weight, body fat, and measurements with clean visual progress
Prescosoft Body Progress Tracker helps you log daily or weekly body metrics, estimate body fat, see trend arrows, chart progress, and back up your data — all in your browser with localStorage.
Log an entry to begin
Estimated from your measurements
Tip: log at the same time of day and use the same measurement locations for cleaner trends.
Dashboard
Your latest stats, goal distance, and long-term trend indicators.
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Log Entry
Enter weight, measurements, optional caliper reading, and notes. Body fat is estimated live as you type.
Progress Charts
Smooth line charts with tooltips, points, and date labels.
Weight Over Time
Body Fat % Over Time
Waist Circumference
Weight + Body Fat Overlay
Progress History
Sort by date, filter by range, and edit or delete past entries.
| Date ⇅ | Weight | Body Fat | Waist | Avg Thigh | Caliper | Method | Notes | Actions |
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Settings & Backup
Persist units, body settings, goals, and data backup choices in localStorage.
Preferences
Data Management
Everything is saved under the localStorage key prescosoft_bodyprogress.
Frequently Asked Questions
Answers about body fat estimation, measurement tracking, data privacy, and how to get the most from this tool.
Is my body progress data private?
Yes. All entries are saved exclusively in your browser's localStorage. The app has no backend, no account system, and no server-side data storage. Your weight, measurements, body fat estimates, and notes never leave your device. Compare this to apps like MyFitnessPal or Fitbit which sync health data to cloud servers.
Which body fat calculation methods are included?
Three methods: the US Navy circumference estimate (uses height, neck, and waist — accurate to ±3–4%), a single-site abdomen caliper estimate (skin-fold pinch in mm), and a combined estimate that averages both when multiple inputs are available. Each is clearly labeled with its confidence level.
Can I back up or transfer my data?
Yes. Use the Export JSON button in Settings to download a complete backup of all entries and preferences. Import it later on the same browser or a different device. This gives you full ownership of your data in a portable format.
What body measurements should I track for best results?
At minimum, track weight and waist circumference (above the navel). Adding neck circumference enables the US Navy body fat estimate. Thigh measurements provide additional body composition insight. Log notes about diet changes, training phases, or sleep quality to correlate with progress.
How often should I log body measurements?
Weekly is optimal for most people. Weigh yourself at the same time of day, same conditions (morning, fasted, after bathroom). Daily measurements create noise from water retention fluctuations. Weight changes of 1–2 lbs per day are normal and don't indicate progress or regression.
Why does my weight go up even when I'm losing fat?
Water retention, muscle gain, glycogen storage, sodium intake, and hormonal fluctuations can all increase scale weight while body fat simultaneously decreases. This is why tracking waist circumference and body fat percentage alongside weight gives a much more accurate picture of real progress.