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Weight Loss Tracker & BMI Calculator

Welcome to your free, local weight and BMI tracker. Unlike other online calculators, this can act as your personal, secure progress tracker. Easily calculate your BMI by logging your data, and instantly calculate powerful metrics like BMI and BMR to visualise your unique fitness journey. This comprehensive online weight tracker helps you meet your goals and maintain a **healthy lifestyle**.

Personal Info ⓘ Used to calculate metrics (BMI, BMR). Height, sex, and date of birth are essential for accurate BMR. Height should be entered in metres (m) if unit is set to kg, or feet/inches if unit is set to lbs.

New Weight Entry ⓘ Log your latest weight and select the date. If an entry already exists for that date, it will be overwritten.

Goal Weight ⓘ Set your target weight here. The app will show your remaining progress to this goal. Target BMI is calculated automatically, relying on your saved height.

Ideal BMI Range ⓘ Calculates the optimal weight range (BMI 18.5 to 24.9) based on your current height, offering a benchmark for your fitness goals.

Requires height to be set.

Underweight Normal Overweight Obese

Progress overview ⓘ A summary of your key metrics. The card highlights your most important status numbers for quick viewing.

Current statistics

Initial weight / BMI

N/A

BMI: N/A

Date: N/A

N/A

BMI: N/A

Change: N/A

Goal weight / BMI

N/A

Target BMI: N/A

Remaining: N/A

Estimated time to goal ⓘ The estimate is based on your recent 2–4 week trend. Safe rate is 0.5–1.0 kg per week.

Total logs

0

Current BMR

N/A

BMR change

N/A

Age

N/A

Logs/week: — ⓘ Average number of distinct days you logged weight over the last 4 weeks.
Confidence: — ⓘ Confidence reflects how consistent your logging is. ≥5 Logs per Week = High, 3–5 = Medium, 1–3 = Low, less than 1 = Very low.
ⓘ Chart view: Select how the data points are aggregated: Individual daily logs, weekly averages, or monthly averages.

Milestones

History ⓘ A list of all logged entries. Use the edit button to modify an existing entry or the trash can to delete it.

No weight entries yet. Start logging!

Data tools & privacy

Quick feature guide

This personal tracker software allows you to:

  • Log your weight entries and easily calculate your BMI.
  • Automatically calculate BMI & BMR (Basal metabolic rate).
  • Set a target goal and visualise your weight loss trend.
  • Toggle data charts by day, week, or month.

Disclaimer: This tool is for informational and personal tracking purposes only. The metrics (BMI, BMR) are guides, not medical advice. Always consult a qualified healthcare professional before making any changes to your diet, exercise routine, or medical treatment.

Privacy & local storage

Zero cloud storage. Your private data security is tied directly to your computer and browser profile. No data leaves your device, meaning no one can remotely access your fitness history.

Warning: clearing your browser's site data/cookies for this file will permanently erase your logs. Always export a backup!

Data management tools

Download a portable JSON file containing all your logs and settings for backup.

Upload a backup file. Warning: this overwrites all current local data.