Log daily weight entries with trend line chart, goal tracking, and BMI calculation over time.
Weight Tracker logs a date and weight for each entry you type in, plots them on a time-series chart, and draws a trend line through the scatter so short-term ups and downs don't obscure the overall direction. Enter your height once and it converts each logged weight into a BMI value alongside the raw number. Set a goal weight and the chart marks how far you currently sit from it. The most common surprise: the trend line is a smoothed line through many points, not the literal value for any single day, so one unusually high or low weigh-in shifts it only slightly rather than snapping the whole chart to match.
A concrete input and expected output from the current implementation.
Input
Height: 70 in (5'10"); weight entry: 180 lb
Expected output
BMI = 25.8
Using the standard formula BMI = 703 x weight(lb) / height(in)^2: 703 x 180 = 126,540, divided by 70^2 (4,900) = 25.8245, which rounds to 25.8.
Each entry (date and weight, sometimes a note) is saved and plotted as a point on a time-series chart. Points accumulate as you log more days, and the x-axis spans your full entry history, so gaps between weigh-ins are visible on the chart just as clearly as the values themselves are.
A trend line is drawn through the logged points to show the underlying direction of change rather than the daily zig-zag caused by hydration, sodium, or timing of the last meal. A goal weight you set appears as a reference line on the same chart, and each entry's BMI is recalculated from the height you supply, paired with that day's weight.
No. Entries are kept in local storage on whatever browser and device you used to log them, so there is no automatic sync between devices. If the tool provides an export option, use it to move your log manually to another device.
No. BMI requires both weight and height. Without a height on file, the tool can still log and chart your weight and trend, but it has nothing to divide by, so the BMI field stays blank for those entries.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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