1. What is Percent Fat Loss?

Percent fat loss measures how much body fat you've lost relative to your starting amount. Unlike weight loss which includes water and muscle, fat loss specifically tracks changes in body fat composition.

2. How Does the Calculator Work?

The calculator uses the percent fat loss formula:

Where:

• Initial Fat — Starting body fat mass in kilograms
• Current Fat — Current body fat mass in kilograms

Explanation: The formula calculates what percentage of your original body fat you've lost. A higher percentage indicates more significant fat loss.

3. Importance of Tracking Fat Loss

Details: Tracking fat loss (rather than just weight loss) provides a more accurate picture of body composition changes, especially when combined with strength training that may increase muscle mass.

4. Using the Calculator

Tips: Enter your initial and current body fat in kilograms. For best results, use body fat measurements from the same method (DEXA, calipers, bioimpedance, etc.) for consistency.

5. Frequently Asked Questions (FAQ)

Q1: How is this different from weight loss percentage?
A: Weight loss includes all mass (fat, muscle, water), while fat loss percentage specifically measures changes in body fat.

Q2: What's a good fat loss percentage?
A: 5-10% is noticeable, 10-15% shows significant change, and 15%+ is transformative. Healthy loss is typically 0.5-1% of body fat per week.

Q3: How often should I measure body fat?
A: Every 2-4 weeks, as daily fluctuations are normal and short-term changes may be minimal.

Q4: Why use kg instead of body fat percentage?
A: This calculator uses fat mass (kg) because body fat percentage depends on total weight which may include muscle gains.

Q5: Can I use pounds instead of kilograms?
A: Yes, but use the same unit for both measurements (convert kg to lbs by multiplying by 2.205).