1
Enter Your Weights
Input your starting weight and current weight. The tool will automatically use your preferred unit system (Imperial or Metric) based on your language.
weight loss percentage calculator
Weight loss percentage calculator - Track your progress by entering start and current weight to calculate fat loss rate. Free health tool with instant results!
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Calculate your weight loss percentage
lbs
lbs
Calculation History
| Start Weight | Current Weight | Percentage | Weight Change | Date |
|---|---|---|---|---|
| No calculation records | ||||
Weight Loss Percentage Formula
The formula to calculate your weight loss percentage is: weight lost divided by starting weight, then multiply the result by 100.
Percentage =
Weight Lost
Start Weight
× 100
Example
(5lbs ÷ 150lbs) × 100 = 3.33%\n\nIf your starting weight is 150lbs and you lost 5lbs, you've lost 3.33% of your body weight.
Note: Please keep in mind, this calculates total weight loss including muscle. A better indicator of how you're doing would be to calculate how much body fat you're losing. It's the fat you want to lose, not the muscle!
Guide & table of contents
Key Features
🔄Smart Unit Switching
Seamlessly switch between Imperial (lbs) and Metric (kg) units with automatic conversion and localized defaults.
📊History Tracking
Automatically save and track all your weight loss calculations with sortable history table and detailed records.
🧠Smart Weight Inheritance
Intelligently uses your previous current weight as the starting weight for your next calculation, making continuous tracking effortless.
How to use weight loss percentage calculator
2
Calculate Results
Click the Calculate button to instantly see your weight loss percentage, weight change, and detailed breakdown of your progress.
3
View History
All your calculations are automatically saved and displayed in a sortable table. Click on column headers to sort by percentage or date.
4
Manage Records
Use the control buttons to either keep only the recent 10 records or clear all history. Your data is stored locally in your browser for privacy.
FAQs about weight loss percentage calculator
Why should you use the Weight Loss Percentage Calculator?
Tracking weight loss manually can be complicated and inaccurate, especially over time. The Weight Loss Percentage Calculator not only quickly and accurately calculates your weight loss percentage, but also lets you record each result with dates, making it easy to monitor and compare your progress.
Is my data safe and private?
Yes, absolutely! All your weight data and calculation history are stored locally in your browser only. Our website does not collect, store, or transmit any of your personal weight information to our servers. You can delete all data at any time by clearing your browser cookies.
How do I clear my calculation history?
You have two options to manage your history: 1) Click "Keep Recent 10" to keep only your most recent 10 calculations, or 2) Click "Clear History" to remove all saved data. Both buttons are located at the bottom of the history table. Remember, once cleared, the data cannot be recovered.
How do Imperial and Metric conversions work?
The tool automatically handles conversions between Imperial (pounds) and Metric (kilograms) units. When you switch units, your existing data remains unchanged, but new calculations will use the selected unit. For reference: 1 kg = 2.20462 lbs, and 1 lb = 0.453592 kg. The tool maintains accuracy to one decimal place for all calculations.
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