Last updated: March 2026
What Is the Weight Loss Tracker?
The Weight Loss Tracker is a free online tool that charts your daily weight to show trends, weekly averages, and projected goal dates — no signup, no app download required. Log your weight each day, see a smoothed trend line that filters out daily fluctuations, and track exactly how far you are from your goal.
An estimated 45 million Americans start a diet each year, and the #1 predictor of success is consistent self-monitoring. A study published in the journal Obesity found that people who weigh themselves daily lose three times more weight than those who weigh weekly. Dedicated weight tracking apps like Happy Scale and Libra require installation and often push premium subscriptions.
This tool gives you the core tracking experience — daily logging, trend analysis, goal projection, and BMI updates — entirely in your browser. Your data is stored locally and never sent to any server. Export as CSV to keep a permanent record or share with your healthcare provider.
How to Use the Weight Loss Tracker
Step 1: Set your starting weight, goal weight, and optionally your target date and height (for BMI tracking). Choose pounds or kilograms.
Step 2: Each day, enter your weight and click "Log Weight." The chart updates instantly with your new data point. Add notes for context — meals, exercise, or anything that might explain a spike or drop.
Step 3: Watch the gold trend line (7-day moving average) for your real direction. Ignore daily spikes caused by water weight, sodium, or a big meal. The trend line is what matters.
Step 4: Check the stats panel for total weight lost, weekly rate, projected goal date, current BMI, and your logging streak. The progress bar shows how far you've come.
Step 5: Export as CSV to save your data permanently, or import a previous export to restore your history on a new device.
Key Features
Visual Weight Chart. An SVG line chart plots every logged weight with a smooth 7-day moving average overlaid. A dashed goal line shows your target, and a projection line estimates when you'll reach it based on your current rate.
Stats Dashboard. Total lost, remaining, progress percentage, weekly average loss rate, projected goal date, current BMI, best weight recorded, and consecutive logging streak — all updated in real time with each entry.
Editable Log Table. Click any row to edit the weight or add notes. Delete entries you entered by mistake. The table shows date, weight, change from previous day, BMI, and notes.
CSV Export and Import. Download your full history as a CSV file that opens in Excel, Google Sheets, or any spreadsheet app. Import a previous export to restore data on a new device or after clearing your browser.
Frequently Asked Questions
Should I weigh myself every day?
Daily weighing gives the most accurate trend data. Weight fluctuates 1-4 lbs day-to-day from water, food, and sodium — the 7-day moving average on the chart filters this noise and shows your real trajectory.
Why does my weight go up even when I'm dieting?
Water retention from sodium, carbs, exercise soreness, and hormonal cycles can spike the scale 1-3 lbs temporarily. Look at the trend line, not individual days. A consistent downward trend over 2+ weeks means you're losing fat.
What's a healthy rate of weight loss?
1-2 pounds per week is considered safe and sustainable by the CDC. The tracker shows your weekly average rate so you can monitor whether your pace is in a healthy range.
How do I save my weight data?
Your data is saved automatically in your browser's local storage and persists between visits. For a permanent backup, click "Download CSV" to export all your logged data as a spreadsheet file. Use "Import CSV" to restore it on any device.
What is the trend line on the chart?
The trend line is a 7-day moving average of your logged weights. It smooths out daily fluctuations to show your actual weight trajectory. This is the line that matters — individual data points bounce around due to water weight and other factors.