Question 1

How accurate is an online body fat calculator?

Accepted Answer

Online body fat calculators provide estimates that can vary in accuracy. The Navy method (using waist, neck, and hip measurements) is generally considered accurate within 3-4% of professional methods like DEXA scans. For most people tracking trends over time, this level of accuracy is sufficient.

Question 2

What is a healthy body fat percentage?

Accepted Answer

Healthy body fat percentages vary by gender and age. For men, 10-20% is generally considered healthy, with athletes often in the 6-13% range. For women, 18-28% is considered healthy, with female athletes often in the 14-20% range. Body fat percentages increase naturally with age.

Question 3

How often should I measure my body fat percentage?

Accepted Answer

For those tracking fitness progress, measuring once every 2-4 weeks is sufficient. Body fat percentage changes slowly, and more frequent measurements might not show meaningful changes. Consistency in measurement technique and timing (same time of day, same hydration level) is important for accurate tracking.

Question 4

Why do different body fat calculation methods give different results?

Accepted Answer

Different methods use different measurements and formulas, each with their own assumptions and limitations. The Navy method uses circumference measurements, while skinfold methods measure fat directly at specific sites. Each method has a margin of error, and some work better for certain body types than others.

Question 5

Can I have too little body fat?

Accepted Answer

Yes. Essential fat (the minimum needed for health) is about 3-5% for men and 8-12% for women. Staying below these levels for extended periods can lead to hormonal imbalances, decreased immune function, nutrient deficiencies, and other health problems. Athletes may temporarily reach very low levels for competition but shouldn't maintain them long-term.

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