This Body Fat Percentage Calculator estimates how much of your body weight consists of fat tissue using BMI-based and waist-neck circumference methods. It provides body fat category, obesity assessment, and possible metabolic health risks for men and women — with dedicated Sri Lankan and Asian standards alongside Western benchmarks.
This body fat calculator estimates the proportion of your body weight that consists of fat tissue using two validated methods. Unlike BMI, which only compares weight with height, body fat % gives a more direct picture of body composition, obesity risk, and possible metabolic health risks including visceral fat accumulation and belly fat.
Please note: This is an estimated calculation, not an exact measurement. Accurate body fat assessment requires clinical methods such as DEXA scans. This online body composition calculator uses mathematical formulas to provide an approximate value for health screening purposes.
This calculator provides two commonly used estimation methods. Please select your preferred method below.
| Feature | BMI-Based Method | Circumference (Navy) Method |
|---|---|---|
| Data Needed | Height · Weight · Age · Sex | Neck · Waist · Hip · Height |
| Best For | General population screening | Active & muscular individuals |
| Home Accuracy | Moderate | Higher (home-based) |
| Asian/Sri Lankan Standards | Both methods support Sri Lankan (Asian) & Western risk thresholds | |
This is an estimated result based on a mathematical formula. It is not a medical diagnosis. Body fat percentage calculators have limitations and may be less accurate for athletes, elderly individuals, and pregnant women. Please consult a qualified healthcare provider for personalised advice.
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What is a healthy body fat percentage? The answer depends on your sex and the population standard used. The tables below show both Asian/Sri Lankan and Western classifications. For Sri Lankans and South Asians, the Asian thresholds are recommended — as metabolic risk begins at lower body fat levels in this population.
| Body Fat % | Category |
|---|---|
| < 8% | Very Low |
| 8 – 15% | Lean / Fit |
| 16 – 22% | Acceptable |
| 23 – 24% | Increased Metabolic Risk |
| ≥ 25% | Obesity / High Risk |
| Body Fat % | Category |
|---|---|
| < 18% | Very Low |
| 18 – 25% | Lean / Fit |
| 26 – 32% | Acceptable |
| 33 – 34% | Increased Metabolic Risk |
| ≥ 35% | Obesity / High Risk |
| Body Fat % | Category |
|---|---|
| 2 – 5% | Essential Fat |
| 6 – 13% | Athletes |
| 14 – 17% | Fitness |
| 18 – 24% | Average |
| ≥ 25% | Obesity |
| Body Fat % | Category |
|---|---|
| 10 – 13% | Essential Fat |
| 14 – 20% | Athletes |
| 21 – 24% | Fitness |
| 25 – 31% | Average |
| ≥ 32% | Obesity |
Online body fat calculators provide estimates, not exact measurements. Results should be interpreted alongside other health indicators and professional medical advice. For clinical guidance, refer to the WHO Obesity & Overweight guidelines.
Medical assessment is recommended if any of the following apply to you:
Body fat percentage (body fat %) is the proportion of your total body weight that consists of fat tissue. It is a more informative measure of body composition than BMI alone, because it accounts for the difference between fat mass and lean mass (muscle, bone, water, and organs). Two people with the same BMI can have very different body fat percentages — which is why fat percentage calculators are increasingly used alongside BMI in metabolic risk assessment.
Excess body fat — especially visceral fat stored deep around the abdominal organs — is a key driver of metabolic disease. High belly fat is directly associated with:
Metabolic risk is not determined by body fat alone — belly fat distribution, physical activity, diet quality, and other factors all contribute. However, body fat % provides a useful starting point for identifying risk and motivating healthy change. After checking your fat percentage, consider also checking your BMI with our BMI Calculator.
Research consistently shows that South Asians — including Sri Lankans — develop metabolic health complications at lower body fat levels than Western populations. This is a critical difference that most online body fat calculators ignore.
| Population | Men — Risk Begins | Women — Risk Begins |
|---|---|---|
| Asian / Sri Lankan | ≥ 23% | ≥ 33% |
| Western | ≥ 25% | ≥ 32% |
The reason is that South Asians tend to accumulate more visceral fat (fat around internal organs) at the same overall body weight, making them more susceptible to insulin resistance and type 2 diabetes even at a "normal" body fat percentage by Western standards. This calculator uses Asian-specific thresholds for Sri Lankan and South Asian individuals.
Yes — and this is especially common in Sri Lanka and South Asia. This condition is sometimes called the "thin-fat" phenotype or "skinny fat". A person may appear slim or have a normal BMI, but carry excess body fat — particularly belly fat and visceral fat — with low muscle mass.
This is why checking body fat percentage alongside BMI gives a more complete picture of health. If your BMI appears normal but your body fat % falls in the high or elevated range, a consultation with your doctor is recommended.