Get your personalized Body Mass Index with gender-specific and age-adjusted results — including health risk analysis, healthy weight ranges, and expert guidance.
Enter your height and weight to see your BMI result and health insights.
Enter your height and weight to see your BMI result and health insights.
Enter your details to see your age-adjusted BMI result with decade-specific health insights.
Body Mass Index (BMI) is a widely used screening tool that estimates body fat based on your weight relative to your height. While it's not a direct measure of body fat percentage, it provides a fast and reliable indicator of whether your weight falls within a range associated with good health. Doctors and health professionals use BMI to identify potential weight-related health risks — from cardiovascular disease to metabolic disorders.
The formula is simple: BMI = weight (kg) ÷ height² (m²). However, interpreting that number correctly requires understanding how gender, age, and body composition affect what a "healthy" BMI actually means for you as an individual.
Men typically carry more lean muscle mass than women at the same BMI. This means a man with a BMI of 27 may have a significantly lower body fat percentage than a woman at the same BMI. Our men's BMI calculator provides context around muscle mass and cardiovascular risk specific to male biology, including waist-circumference considerations often missed by generic calculators.
Women naturally carry 6–11% more body fat than men at equivalent BMI values, largely due to hormonal differences and reproductive biology. Factors like menopause, pregnancy history, and estrogen levels all influence where fat is stored. Our women's BMI calculator incorporates gender-specific healthy ranges and highlights risks like osteoporosis and cardiovascular health relevant to women.
Research shows that slightly higher BMI values (up to 27) may actually be protective for adults over 65, reducing fracture risk and supporting immune function. Conversely, younger adults with BMI over 25 face greater long-term metabolic risk. Our age-adjusted BMI calculator uses decade-specific context so you're not comparing yourself to a one-size-fits-all standard.
BMI doesn't distinguish between fat and muscle — a highly athletic person may show "overweight" on a standard BMI scale. It also doesn't account for where fat is distributed on your body (visceral vs. subcutaneous fat). For the most accurate picture of your health, use BMI alongside waist circumference, body fat percentage testing, and regular check-ups with your doctor.
Each calculator takes under 30 seconds to use. Here's exactly what to do — and what your result means.
Select "Men's BMI" if you're male, "Women's BMI" if you're female, or "BMI By Age" if you want age-adjusted interpretation (especially useful if you're over 50 or under 25).
Switch between Metric (centimetres and kilograms) or Imperial (feet, inches, and pounds) using the toggle at the top of the calculator. Both are equally accurate.
Use your barefoot height and weight without clothes for the most accurate result. Measure in the morning before eating for consistency. If using imperial, enter feet and inches separately.
Your BMI score, category, health gauge, and personalised metrics appear instantly. The gauge shows where you fall across all four BMI categories, and the metrics section tells you your healthy weight range and how far you are from it.
The World Health Organization (WHO) defines BMI categories as follows. Note that these are general ranges — your doctor may use slightly different thresholds based on ethnicity, age, or other clinical factors.
| BMI Range | Category | Health Risk | Action Recommended |
|---|---|---|---|
| Below 18.5 | Underweight | Malnutrition, bone loss, immune deficiency | Consult a doctor or dietitian |
| 18.5 – 24.9 | Healthy Weight | Lowest risk for weight-related illness | Maintain current habits |
| 25.0 – 29.9 | Overweight | Elevated risk of diabetes, hypertension | Lifestyle changes recommended |
| 30.0 – 34.9 | Obese (Class I) | High risk for cardiovascular disease | Medical consultation advised |
| 35.0 – 39.9 | Obese (Class II) | Very high risk, multiple comorbidities | Seek medical support urgently |
| 40.0 and above | Obese (Class III) | Extreme risk, significantly reduced life expectancy | Specialist medical intervention needed |
This BMI calculator is provided for general informational and educational purposes only. BMI is a screening tool, not a diagnostic test. Results should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional before making any changes to your diet, exercise routine, or health management plan.