Weight trend calculator.

Why a trend is more useful than a daily number.

Daily weight moves with water, salt, digestion, sleep, training, and the menstrual cycle. A single reading can swing by a kilogram without a meaningful change in body fat. A trend line gives recent readings more weight while still remembering the past, so a bad day does not become a verdict.

How this demo works

Each entry updates an exponentially weighted moving average. With a 7-day half-life, a reading loses half of its influence every seven days. That makes the line responsive to a real change but slow enough to ignore one noisy day.

What it cannot do

• It cannot know the dates of your entries; it assumes one per day.
• It does not restart after a long gap.
• It does not soften outliers the way the app does.
• It does not diagnose, explain, or treat anything.

If you want the full time-aware version, use Weight Track Assistant on Android. It handles gaps, multiple entries, and unusual readings — and keeps the data on your device.