Body Weight Progress Tracker
Free body weight tracker. Log your weigh-ins, see a trend chart, total change, weekly average, and percent toward your goal. Saves in your browser, no account.
Body Weight Progress Tracker
Settings
If you skip starting weight, your first logged entry becomes the baseline. Goal is used for the progress bar and projected date.
Add a weigh-in
No weigh-ins yet
Add your first weigh-in to see the trend, weekly average, and progress toward your goal.
Weight trend
All weigh-ins
Entries live only in this browser. The trend, weekly average, and projection are estimates from your inputs and a straight linear fit. For a metabolically adjusted projection, see the NIDDK Body Weight Planner.
How to use this body weight progress tracker
- Pick your unit (pounds or kilograms) and, if you want, set a starting weight and goal weight in the Settings card.
- Log your first weigh-in. The date defaults to today. Type in your weight and hit Add weigh-in.
- Weigh yourself on a consistent schedule (same day, same time, same conditions) and log each reading as you go.
- Watch the weekly average and trend line, not the daily number. Use the 30d, 75d, and All chips to widen or tighten the window.
The reason the tracker leans on the weekly average is that day-to-day swings are mostly water, glycogen, and digestive contents, so any single reading is noisy. Fitwatch and Fourmilab both make the same case: use the trend, not the dot. One bad weigh-in is not a stalled diet, it is one bad weigh-in.
How the weekly average and goal progress are calculated
Weekly average is (latest weight in the selected window minus first weight in that window) divided by (days between, divided by 7). Worked example: if you logged 200 lb on day 1 and 196 lb 14 days later, that is (196 minus 200) divided by (14 divided by 7), or negative 2 lb per week. The tracker needs at least 7 days of data before it shows a number. Until then, you get a dash.
Percent to goal is (baseline minus latest) divided by (baseline minus goal), times 100, clamped between 0 and 100 percent. Baseline is whatever you set as starting weight, or your first logged weigh-in if you left it blank. The same formula handles gain goals (where goal is higher than baseline) by flipping the signs. It is the same math used by spreadsheet templates from Vertex42 and Fitwatch\'s Average Weight Lost Over Time tool.
Tips for tracking weight on a 75-day challenge
- Same day, same time, same conditions. Most people pick first thing in the morning, after the bathroom, before food or water. The Cleveland Clinic recommends this for the cleanest baseline.
- Pair the scale with other signals. Use the progress photo compare tool plus a tape measure on waist and hips. Body composition shifts often show up in photos before they show up on the scale.
- Do not restart your challenge over a single bad reading. If you are running 75 Tough or 75 Soft, the rules are about your daily tasks, not the scale. The trend over weeks is the real result.
- Recalculate your targets every 10 to 15 lb. As you get smaller, your TDEE drops, so the macros and calorie targets you started with will not be the right ones later. Use the calorie deficit calculator and macro calculator to refresh.
Beyond the scale: what to track alongside weight
The scale is one signal of many. On a multi-day wellness challenge, the daily checklist (workouts, water, food, reading, photos) does the actual work, and the trend on the scale is one way to see whether the inputs are landing. Track those inputs alongside your weigh-ins: workouts done, water, sleep, mood, and a weekly progress photo. Reset75 handles the daily checklist part on iOS and Android, and you can keep this page open in a tab for the trend chart.
Map the whole challenge with the 75-day challenge calculator so your weigh-ins line up with milestones (day 21, 30, 50, 66, 75). The scale moves slowest at the start (water flushes first) before it settles into the long, steady fat-loss curve that the weekly average is built to surface.
Frequently Asked Questions
Common questions about body weight progress tracker
How often should I weigh myself during a 75-day challenge?
Weekly is plenty for most people. Daily is fine if the number motivates you instead of wrecking your day. Either way, pick one schedule and stick to it: same day, same time, same conditions (most people do first thing in the morning, after the bathroom, before food or water). The trend only means something if the conditions are consistent.
Why does my weight go up and down day to day?
Most of the daily noise is water, sodium, glycogen, and whatever is still in your gut. A salty dinner, a hard workout, or a bad night of sleep can shift the scale 2 to 4 lb overnight, and none of it is fat. That is why the tracker shows the weekly average instead of the latest reading. The trend is what tells you whether the fat is actually moving.
What is a healthy rate of weight loss?
About 0.5 to 1 percent of body weight per week, which works out to roughly 1 to 2 lb for most adults. The Cleveland Clinic and the American Heart Association both land in that range. Faster loss in the first week or two is usually water and is hard to keep up. If your weekly average sits above 2 lb for several weeks in a row, look at sleep and protein before cutting calories any further.
How is the weekly average change calculated?
It is (latest weight minus first weight in the selected window) divided by (days between, divided by 7). The tracker waits until you have at least 7 days of data before it shows a number. Use the View chips above the chart (30d, 75d, all) to change which window the average runs over.
How is "percent to goal" calculated?
(baseline minus latest) divided by (baseline minus goal), times 100, clamped to 0 to 100 percent. The baseline is your starting weight if you set one, otherwise it is your first logged weigh-in. The math handles gain goals too.
Where is my data stored?
Only in your browser's localStorage. Nothing leaves your device, no account is required, and the page works offline once it has loaded. Clearing your browser data will wipe your weigh-ins, so use Copy as CSV every so often if you want a backup you can keep.
Can I switch between pounds and kilograms?
Yes. Flip the unit toggle in the Settings card and every number on the page converts on the spot. Values are stored in the unit you entered them in, so toggling does not rewrite your history, it only changes how it is displayed.
Can I export my weigh-ins?
Yes. Hit Copy as CSV to grab a date,weight table to your clipboard, then paste it into a spreadsheet, a notes app, or your Reset75 notes. Pair it with the progress photo compare tool for a fuller picture than the scale alone.