Calculate BMI, BMR, daily calories, ideal weight range and body fat % — free, no login.
Enter your details for a complete health analysis. Results appear instantly with personalised tips.
| BMI Range | Category | Health Risk |
|---|---|---|
| < 16 | 🔵 Severely Underweight | High — malnutrition |
| 16 – 18.5 | 🔵 Underweight | Moderate |
| 18.5 – 24.9 | 🟢 Normal Weight | Low — healthy range ✓ |
| 25.0 – 29.9 | 🟡 Overweight | Moderate |
| 30.0 – 34.9 | 🟠 Obese Class I | High |
| 35.0 – 39.9 | 🔴 Obese Class II | Very High |
| ≥ 40.0 | 🟣 Obese Class III | Extremely High |
Our free BMI Calculator is one of the most comprehensive health calculators available online. In just seconds, it calculates your Body Mass Index (BMI), Basal Metabolic Rate (BMR), daily calorie needs (TDEE), ideal weight range, estimated body fat percentage, and gives you personalised health tips — all completely free, no login required.
Whether you want to lose weight, build muscle, or simply check if you are in a healthy weight range for your height and age, our BMI tool gives you all the information you need to make informed decisions about your health.
Body Mass Index (BMI) is a widely used screening tool that estimates whether a person has a healthy body weight relative to their height. It is calculated by dividing your weight in kilograms by the square of your height in metres.
BMI Formula: BMI = Weight (kg) ÷ Height (m)2
While BMI does not directly measure body fat, research consistently shows it correlates strongly with health outcomes. A high or low BMI is associated with increased risk of numerous health conditions including type 2 diabetes, heart disease, hypertension, joint problems, and nutritional deficiencies.
Select Male or Female. Gender affects BMR calculation (the Mifflin-St Jeor equation uses different constants for men and women) and body fat percentage estimation.
Enter your age in years (2–120). Age affects your BMR — older individuals generally have a lower metabolic rate due to changes in muscle mass and hormonal factors.
Click the green button. Your results appear instantly including BMI score, category, animated gauge, BMR, TDEE, body fat %, ideal weight range, calorie targets, and health tips.
| BMI Range | Category | Health Risk |
|---|---|---|
| Below 18.5 | Underweight | Nutritional deficiency, immune weakness, osteoporosis |
| 18.5 – 24.9 | Normal Weight | Low risk — healthy, ideal range |
| 25.0 – 29.9 | Overweight | Moderate risk — lifestyle changes advised |
| 30.0 – 34.9 | Obese Class I | High risk — medical advice recommended |
| 35.0 – 39.9 | Obese Class II | Very high risk |
| 40.0 and above | Obese Class III | Extremely high risk — immediate medical attention |
BMR is the number of calories your body burns at complete rest — just to keep your heart beating, lungs breathing, and cells functioning. It is calculated using the Mifflin-St Jeor equation, which is considered the most accurate for most adults:
TDEE is your total daily calorie requirement, calculated by multiplying your BMR by your activity factor. This is the number of calories you need to eat each day to maintain your current weight.
BMI is a useful screening tool but has limitations. It does not directly measure body fat. Athletes and bodybuilders may have a high BMI due to muscle mass, while appearing in the "overweight" category despite being very healthy. Elderly individuals may have a "normal" BMI but low muscle mass. For more accurate assessment, consider body fat percentage measurement.
Research suggests that Asian populations, including Indians, have higher health risks at lower BMI values. While the global WHO standard classifies overweight as BMI ≥25, some Asian health guidelines suggest overweight at BMI ≥23 and obesity at BMI ≥27.5 for Asian adults. Consult your doctor for personalised guidance.
A safe, sustainable rate of weight loss is 0.5–1 kg per week, which requires a calorie deficit of 500–1000 kcal per day below your TDEE. Never eat below 1200 kcal/day (women) or 1500 kcal/day (men) without medical supervision.
Yes, completely free. No account, no login, no ads on results, no limits on how many times you use it.
Your BMI history is saved only in your browser's localStorage — it never leaves your device and is not sent to any server. You can clear your history at any time by clicking the "Clear History" button.
