Weight Log
Log daily bodyweight with a 7-day moving average.
Overview
The Weight Log is a daily bodyweight tracker that smooths out the inevitable scale noise with a seven-day moving average. Daily weight swings of one to two kilograms are normal and reflect water, food in the gut, sodium intake, and hormonal cycles rather than actual body composition change. The moving-average line cuts through that noise so you see the underlying trajectory instead of reacting to every spike.
Anyone in a directed nutrition phase (cut, bulk, recomp, or maintenance) lives or dies by the trend rather than the daily number, and this tool is built to put the trend front and centre. Log once a day, ideally first thing after the bathroom and before food or water, and over a few weeks the moving average tells you whether your plan is working.
How it works
Weights are stored against a date with a unit flag (kilograms or pounds), and the per-day entry is upserted, meaning a second entry for the same date overwrites the first instead of duplicating. Behind the scenes the trend calculator produces a moving average that begins after enough data is available to make the smoothing meaningful.
The chart renders both the raw daily weight (faint line) and the seven-day moving average (bold line) on the same axis, with the y-range auto-fitted to your actual numbers so daily noise stays visible without dwarfing the trend. The list below the chart shows the most recent thirty entries with delete controls.
Examples
- Cutting phase: aim for the moving average to drop 0.4 to 0.7 kilograms per week and ignore the daily zig-zag entirely.
- Bulking phase: target a steady 0.2 to 0.4 kilogram weekly gain on the moving average; faster gains usually mean more fat than muscle.
- Maintenance audit: confirm that the moving average is flat across a four-week window despite normal daily fluctuation.
- Holiday recovery: after a week of inflated readings, watch the moving average reset over five to seven days as water weight clears.
FAQ
When should I weigh in? First thing in the morning, after using the bathroom, before food or water, wearing nothing or the same minimal clothing every time. Consistency matters more than the specific routine.
Daily or weekly? Daily produces the smoothest moving average. Weekly weigh-ins are acceptable but more sensitive to whichever day you happen to pick.
Can I mix kilograms and pounds? The unit is stored per-entry, so a switch is tolerated, but the chart treats values as raw numbers and will show a discontinuity at the switch point. Pick one unit for a given tracking period.
How long until the moving average is meaningful? The average requires multiple days of data before it stabilises. Plan on two weeks before you treat it as signal rather than noise.
Why did my weight jump three kilos overnight? Glycogen and the water bound to it move quickly with carbohydrate intake. Sodium-heavy or carb-heavy meals routinely produce one to three kilogram next-day spikes that resolve within a day or two.