Weight trend calculator
Paste your daily weigh-ins and see the 7-day average, the weekly averages and your real rate of change, with the daily noise taken out.
30 weigh-ins · 4 weekly averages: 96.2, 95.6, 95.0, 94.5 kg
Why the average tells the truth
Body weight moves every day for reasons that have nothing to do with fat or muscle: water, sodium, carbohydrate, food still in transit and sleep. A single weigh-in is a noisy reading, and reacting to it leads to bad decisions.
The calculator smooths this two ways. The line on the chart is a trailing 7-day average of your weigh-ins. The weekly averages group your data in blocks of seven and compare the first block with the last, which gives a rate per week that daily swings barely touch.
How to weigh in
- Weigh every morning, after the bathroom and before eating or drinking.
- Use the same scale in the same spot and wear the same clothing, or none.
- Log every day, including the bad ones. Skipping the high readings flatters the trend.
- Judge the week, not the day. Change your plan only after two or more weeks of data.
Questions
Why use a weekly average instead of the daily number?
Water, salt, food volume and sleep move the scale by one to two kilograms in a day without any change in body fat. Averaging a week of weigh-ins cancels most of that noise, so the trend reflects what your body is actually doing.
How many weigh-ins do I need?
Three gives a rough average. Two full weeks (14 entries) is the minimum for a weekly rate, and four weeks or more gives a rate you can trust. Weigh at the same time under the same conditions, ideally in the morning.
What is a sensible rate of change?
Many coaches keep fat loss at or below about 1% of bodyweight per week, and lean gaining closer to 0.25-0.5% per week. These are general guidelines, not medical advice; talk to a professional for health decisions.
Stop doing this by hand.
Fortis rolls your daily weigh-ins into a 7-day average and a clean trend line automatically, and tracks your pace against your goal.
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