Body Fat Calculator
Body Fat Calculator
Body Fat Classification Standards
| Male/Female | Body Fat Range | Category | Health Risk |
|---|---|---|---|
| Male | 2-5% | Essential Fat | Too low, may affect physiological functions |
| Male | 6-24% | Healthy Range | Low health risk |
| Female | 10-13% | Essential Fat | Too low, may affect physiological functions |
| Female | 14-31% | Healthy Range | Low health risk |
Standard Body Fat Percentage Reference Table
| Age | Underweight | Standard (Healthy) | Standard (Warning) | Mild (Obesity) | Severe (Obesity) | |
|---|---|---|---|---|---|---|
| Male | 18-39 years | 5-10% | 11-16% | 17-21% | 22-26% | 27-45% |
| 40-59 years | 5-11% | 12-17% | 18-22% | 23-27% | 28-45% | |
| 60+ years | 5-13% | 14-19% | 20-24% | 25-29% | 30-45% | |
| Female | 18-39 years | 5-20% | 21-27% | 28-34% | 35-39% | 40-45% |
| 40-59 years | 5-21% | 22-28% | 29-35% | 36-40% | 41-45% | |
| 60+ years | 5-22% | 23-29% | 30-36% | 37-41% | 42-45% |
Normal Body Fat Range
Body fat percentage refers to the proportion of fat mass in total body weight and is one of the key indicators of health. The normal range varies by gender and age.
Normal Body Fat Range for Males:
- Essential fat: 2% - 5% (minimum fat required for basic physiological functions)
- Athletic: 6% - 13% (common among professional athletes)
- Healthy: 14% - 17% (ideal for healthy adult males)
- Acceptable: 18% - 24% (still within healthy range, but worth monitoring)
- Obese: 25% and above (exceeds healthy range, fat loss recommended)
Normal Body Fat Range for Females:
- Essential fat: 10% - 13% (minimum fat required for basic physiological functions)
- Athletic: 14% - 20% (common among professional female athletes)
- Healthy: 21% - 24% (ideal for healthy adult females)
- Acceptable: 25% - 31% (still within healthy range, but worth monitoring)
- Obese: 32% and above (exceeds healthy range, fat loss recommended)
Note: The above are general reference ranges with significant individual variation. Too low body fat may cause hormonal imbalance and weakened immunity; too high increases risk of cardiovascular disease, diabetes and other chronic conditions. Maintain a healthy body fat level through balanced diet and regular exercise.
Body Fat Calculation Formula
1. Adult Male Body Fat Calculation Formula:
- Parameter a = Waist (cm) × 0.74
- Parameter b = Weight (kg) × 0.082 + 44.74
- Body Fat Mass (kg) = a - b
- Body Fat Percentage = (Body Fat Mass ÷ Weight) × 100%
2. Adult Female Body Fat Calculation Formula:
- Parameter a = Waist (cm) × 0.74
- Parameter b = Weight (kg) × 0.082 + 34.89
- Body Fat Mass (kg) = a - b
- Body Fat Percentage = (Body Fat Mass ÷ Weight) × 100%
Generally, the ideal body fat percentage for men under 30 is 14-20%, and for men over 30 is 17-23%. For women under 30, it's 17-24%, and for women over 30, it's 20-27%. If men's body fat exceeds 25% or women's exceeds 30%, please consult a doctor.
Measurement Guide & Tips
Height Measurement
Correct height measurement is important for calculating BMI and body fat percentage.
- Stand straight with heels, buttocks, and shoulders against the wall
- Measure without shoes, looking straight ahead
- Use a height meter or mark on the wall and measure with a tape
- Morning height is 1-2 cm taller than evening height
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Weight Measurement
Accurate weight measurement is fundamental for calculating BMI and body fat percentage.
- Measure in the morning on an empty stomach, after using the bathroom
- Wear light clothing, no shoes
- Measure at the same time each day for consistency
- Place the scale on a hard, flat surface, avoid carpets
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Waist Measurement
Waist circumference is a key parameter for body fat calculation, accurate measurement is crucial.
- Stand relaxed with feet shoulder-width apart
- Find your navel and measure at that level
- The tape should touch the skin but not be tight
- Breathe normally during measurement, don't hold in or push out your stomach
- Morning measurement on an empty stomach is more accurate
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Health Information Disclaimer
Content on this site is for general information only and does not constitute medical advice. Consult a doctor or qualified health professional for personal health concerns. Last updated: August 9, 2026.