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❤️ Your Measurements
Enter your height and weight to calculate your BMI
Height 170 cm
100 cm250 cm
Weight 70 kg
30 kg300 kg
📊 Your BMI Result
✅ Normal Weight
24.2
Body Mass Index
UnderNormalOverObese
✅ Healthy BMI!
Your BMI is in the healthy range. Keep maintaining your lifestyle!
🎯 Your Recommendation
Maintain your current habits with regular exercise and balanced nutrition to stay in this healthy range!
BMI Scale
Underweight
<18.5 Normal
18.5–24.9 Overweight
25–29.9 Obese
30+
<18.5 Normal
18.5–24.9 Overweight
25–29.9 Obese
30+
📏 Your BMI
24.2
🏷️ Category
Normal Weight
✅ Healthy Weight Range
58.0 – 78.6 kg
⚖️ Weight to Lose/Gain
Within range
🎯 Ideal Weight (mid)
68.3 kg
📊 Prime BMI
0.97
📋 BMI Categories Reference Table
| Category | BMI Range | Health Risk | Description |
|---|---|---|---|
| Underweight | Below 18.5 | Moderate | May indicate malnutrition or other health conditions |
| Normal Weight | 18.5 – 24.9 | Low | Healthy weight range associated with lowest health risks |
| Overweight | 25.0 – 29.9 | Increased | Elevated risk of cardiovascular disease and diabetes |
| Obese Class I | 30.0 – 34.9 | High | High risk of serious health conditions |
| Obese Class II | 35.0 – 39.9 | Very High | Very high risk requiring medical attention |
| Obese Class III | 40.0 and above | Extremely High | Extremely high risk — immediate medical consultation recommended |
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What is BMI?
Body Mass Index (BMI) is a numerical value calculated from your height and weight. It is a widely used screening tool to categorize individuals as underweight, normal weight, overweight or obese. BMI provides a simple and inexpensive method to assess whether a person has a healthy body weight relative to their height.
BMI is used by healthcare professionals worldwide as an initial screening tool. While it does not directly measure body fat percentage, research has shown that BMI correlates reasonably well with body fat in most adults.
BMI Formula
The BMI formula differs slightly depending on whether you use metric or imperial measurements:
Metric: BMI = weight (kg) ÷ height² (m²)
Imperial: BMI = 703 × weight (lbs) ÷ height² (inches²)
Example (Metric):
Weight = 70 kg, Height = 1.70 m
BMI = 70 ÷ (1.70 × 1.70) = 70 ÷ 2.89 = 24.2
What is a Healthy BMI?
For most adults aged 18 to 65, a BMI between 18.5 and 24.9 is considered healthy. A BMI below 18.5 suggests underweight, between 25 and 29.9 is overweight, and 30 or above is classified as obese. These categories are defined by the World Health Organization (WHO) and are used globally.
BMI Limitations — What BMI Does Not Tell You
- BMI does not distinguish between muscle and fat — athletes with high muscle mass may have a high BMI despite low body fat
- BMI does not account for age — older adults naturally have more body fat at the same BMI as younger adults
- BMI does not indicate where fat is distributed — abdominal fat is more dangerous than fat stored elsewhere
- BMI may be less accurate for people of certain ethnic backgrounds — Asian populations face higher health risks at lower BMI values
- BMI is not suitable for children, pregnant women or extremely muscular individuals
How to Maintain a Healthy BMI
- Engage in at least 150 minutes of moderate aerobic activity or 75 minutes of vigorous activity per week
- Eat a balanced diet rich in vegetables, fruits, lean proteins and whole grains
- Limit processed foods, added sugars and excessive saturated fats
- Stay well hydrated — drink at least 8 glasses of water daily
- Get 7 to 9 hours of quality sleep each night
- Manage stress through meditation, exercise or other healthy coping strategies
- Consult your healthcare provider regularly for personalized guidance
⚠️ Medical Disclaimer: This BMI calculator is for informational and educational purposes only. BMI is a screening tool and not a diagnostic measurement. It should not replace professional medical advice, diagnosis or treatment. Always consult a qualified healthcare professional regarding your weight, health and fitness goals.
Complete BMI Guide — What Your Number Really Means
Body Mass Index (BMI) is the most widely used screening tool for assessing weight status in adults worldwide. Calculated from height and weight alone it provides a quick and free estimate of whether a person is underweight, healthy weight, overweight or obese. While BMI has limitations it remains the standard tool used by the World Health Organization, NHS and healthcare providers globally for population-level weight screening.
BMI Categories — What Is a Healthy BMI?
| BMI Range | Category | Health Risk | Action |
|---|---|---|---|
| Below 18.5 | Underweight | Moderate | Consult doctor — may indicate nutritional deficiency |
| 18.5 — 24.9 | Healthy Weight | Minimal | Maintain with balanced diet and regular activity |
| 25.0 — 29.9 | Overweight | Increased | Lifestyle changes recommended — diet and exercise |
| 30.0 — 34.9 | Obese Class I | High | Medical consultation advised |
| 35.0 — 39.9 | Obese Class II | Very High | Medical supervision strongly recommended |
| 40.0 and above | Obese Class III | Extremely High | Immediate medical consultation required |
Healthy Weight Range by Height
What counts as a healthy weight depends entirely on your height. The table below shows the healthy BMI weight range (18.5-24.9) for common heights in both metric and imperial measurements.
| Height | Min Healthy (kg) | Max Healthy (kg) | Healthy Range (lbs) |
|---|---|---|---|
| 155 cm (5'1") | 44.4 kg | 59.9 kg | 98 — 132 lbs |
| 160 cm (5'3") | 47.4 kg | 63.9 kg | 104 — 141 lbs |
| 165 cm (5'5") | 50.4 kg | 67.9 kg | 111 — 150 lbs |
| 170 cm (5'7") | 53.5 kg | 72.1 kg | 118 — 159 lbs |
| 175 cm (5'9") | 56.7 kg | 76.4 kg | 125 — 168 lbs |
| 180 cm (5'11") | 60.0 kg | 80.9 kg | 132 — 178 lbs |
| 185 cm (6'1") | 63.3 kg | 85.3 kg | 140 — 188 lbs |
BMI Formula — How Is It Calculated?
BMI Formula (Metric):
BMI = Weight (kg) ÷ Height (m)²
Example — 70 kg, 175 cm:
BMI = 70 ÷ (1.75 × 1.75)
BMI = 70 ÷ 3.0625
BMI = 22.9 → Healthy Weight ✅
BMI Formula (Imperial):
BMI = (Weight lbs × 703) ÷ Height (inches)²
Example — 154 lbs, 5ft 9in (69 inches):
BMI = (154 × 703) ÷ (69 × 69)
BMI = 108,262 ÷ 4,761
BMI = 22.7 → Healthy Weight ✅
Limitations of BMI — When It Is Not Accurate
BMI is a useful screening tool but has well-documented limitations that healthcare providers account for in clinical assessments.
- Muscular individuals: Athletes and bodybuilders often have high BMIs despite very low body fat because muscle weighs more than fat. A BMI of 27 is common in professional athletes who are in peak physical condition.
- Older adults: Elderly people may have a normal BMI but high body fat due to age-related muscle loss — called sarcopenic obesity. BMI underestimates health risk in this group.
- Ethnic variations: Asian populations have higher health risks at lower BMI values. Many Asian health guidelines recommend overweight classification starting at BMI 23 rather than 25.
- Pregnancy: BMI is not a valid health indicator during pregnancy as weight gain is expected and necessary for healthy fetal development.
For a more accurate picture of body composition use our Body Fat Calculator which measures actual fat percentage rather than just weight relative to height.
How to Reach and Maintain a Healthy BMI
- Calculate your calorie needs: Use our Calorie Deficit Calculator to find exactly how many calories you need to reach your target weight safely.
- Lose at a sustainable rate: Aim for 0.5 kg per week maximum weight loss to preserve muscle and avoid metabolic slowdown.
- Build muscle alongside fat loss: Resistance training improves body composition even when BMI changes slowly — your body looks and feels better even at the same weight.
- Focus on habits not just numbers: Sustainable lifestyle changes — regular activity, balanced nutrition, quality sleep — matter more than achieving a specific BMI number.
⚠️ Health Disclaimer: BMI is a screening tool only and does not diagnose body fatness or health. It should not be used as a sole indicator of health status. Always consult a qualified healthcare provider for a complete health assessment and personalized advice regarding weight management.
Frequently Asked Questions About BMI
Is BMI an accurate measure of health? +
BMI is a useful screening tool but it has limitations. It does not measure body fat directly, does not account for muscle mass, age or body fat distribution. Athletes may have a high BMI due to muscle rather than fat. BMI should be used alongside other health indicators for a complete picture.
What is a healthy BMI for women? +
The healthy BMI range is the same for both men and women — between 18.5 and 24.9. However, women naturally carry a higher percentage of body fat than men at the same BMI, which is normal and healthy. Some research suggests the ideal BMI for women may be slightly lower at 21–23.
What is a healthy BMI for men? +
For adult men, a BMI between 18.5 and 24.9 is considered healthy. Men typically have less body fat and more muscle mass than women at the same BMI. Muscular men such as athletes may have a BMI above 25 while still being very healthy.
How can I lower my BMI? +
To lower your BMI, you need to reduce body weight through a combination of healthy eating and regular physical activity. Creating a moderate calorie deficit of 500 calories per day can help you lose approximately 0.5 kg per week. Strength training helps preserve muscle while losing fat. Always consult a doctor before starting a weight loss program.
What BMI is considered obese? +
A BMI of 30 or above is classified as obese according to World Health Organization (WHO) standards. Obesity is further divided into three classes — Class I (30–34.9), Class II (35–39.9) and Class III or severe obesity (40 and above). Each class carries progressively higher health risks.
Can BMI be different for different ethnicities? +
Yes — research shows that health risks occur at lower BMI values in some ethnic groups. For people of Asian descent, WHO suggests lower cut-off points: overweight at BMI 23 and obese at BMI 27.5, compared to the standard 25 and 30. This is because Asian populations tend to carry higher body fat at the same BMI compared to Caucasian populations. Always discuss your individual risk with your doctor.
What is BMI used for in medical practice? +
Healthcare professionals use BMI as a quick screening tool to identify potential weight-related health risks. It helps flag patients who may need further assessment for conditions like type 2 diabetes, cardiovascular disease and hypertension. BMI is also used to determine eligibility for certain medical treatments. Doctors always use it alongside waist circumference, blood pressure and blood tests for a complete health picture.