BMI Calculator
Calculate your Body Mass Index (BMI) to assess if you're underweight, normal weight, overweight, or obese. Get personalized health insights and recommendations.
Enter Your Details
Health Analysis
Health Risk Assessment
- Low risk of weight-related diseases
- Healthy metabolic profile
- Monitor weight gain
Recommendations
- Maintain balanced diet with portion control
- Continue regular physical activity
- Ensure 7-8 hours of quality sleep
- Annual health check-ups recommended
Body Composition
Weight Management Goals
Maintain Weight
Consume approximately 2,100 calories daily to maintain current weight.
- Continue current exercise routine
- Monitor weight weekly
- Adjust intake if weight changes ±2kg
Lose Weight
Consume approximately 1,600 calories daily to lose 0.5kg per week.
- Reduce calorie intake by 500 kcal/day
- Increase cardio exercise
- Aim for 1-2kg loss per month
Gain Muscle
Consume approximately 2,400 calories daily with strength training.
- Increase protein intake
- Strength training 3-4 times/week
- Monitor body composition
Track Your Progress
Record Your BMI
Track changes over time to monitor progress
BMI Categories & Health Risks
Underweight
Health Risks:
- Nutritional deficiencies
- Osteoporosis
- Weakened immune system
- Anemia
Recommendations:
- Increase calorie intake
- Strength training
- Nutrition counseling
- Medical evaluation
Normal Weight
Health Risks:
- Lowest risk
- Healthy metabolism
- Optimal organ function
- Reduced disease risk
Recommendations:
- Maintain healthy habits
- Regular exercise
- Balanced nutrition
- Annual check-ups
Overweight
Health Risks:
- Type 2 diabetes
- High blood pressure
- Heart disease
- Sleep apnea
Recommendations:
- Weight management
- Increased activity
- Portion control
- Medical consultation
Obese
Health Risks:
- Severe health complications
- Stroke risk
- Certain cancers
- Reduced life expectancy
Recommendations:
- Medical supervision
- Structured program
- Dietary intervention
- Regular monitoring
About BMI Calculator
The Body Mass Index (BMI) calculator helps you assess whether your weight is in a healthy range for your height. BMI is a simple screening tool that can indicate potential weight-related health problems.
How BMI is Calculated
Metric Formula
Formula: BMI = weight (kg) ÷ height² (m²)
Example: 65 kg ÷ (1.70 m × 1.70 m) = 22.5
Imperial Formula
Formula: BMI = [weight (lbs) ÷ height² (in²)] × 703
Example: [143 lbs ÷ (67 in × 67 in)] × 703 = 22.5
BMI Categories
Underweight: < 18.5
Normal: 18.5 - 24.9
Overweight: 25 - 29.9
Obese: ≥ 30
Child BMI Percentile
Compares child's BMI to same age/sex peers
Underweight: < 5th percentile
Healthy: 5th - 85th percentile
Overweight: 85th - 95th percentile
Obese: ≥ 95th percentile
BMI Limitations
Muscle Mass
BMI doesn't distinguish between muscle and fat. Athletes with high muscle mass may have high BMI but low body fat.
Body Frame
Doesn't account for body frame size. People with larger frames may have higher BMI despite healthy body composition.
Age & Gender
Standard BMI categories may not be accurate for elderly, pregnant women, or certain ethnic groups.
Fat Distribution
Doesn't show where fat is stored. Waist circumference provides additional important information.
Alternative Health Metrics
| Metric | What it Measures | Healthy Range | Advantages |
|---|---|---|---|
| Waist Circumference | Abdominal fat | Men: < 102 cm Women: < 88 cm |
Measures visceral fat (high risk) |
| Waist-to-Hip Ratio | Fat distribution | Men: < 0.90 Women: < 0.85 |
Identifies apple vs pear shape |
| Body Fat Percentage | Fat vs lean mass | Men: 8-19% Women: 21-33% |
Most accurate body composition |
| Waist-to-Height Ratio | Central obesity | < 0.5 | Simple and effective screening |
Health Recommendations by BMI
| BMI Category | Dietary Changes | Exercise Plan | Medical Advice |
|---|---|---|---|
| Underweight | Increase calorie-dense foods Frequent meals Protein supplements |
Strength training Light cardio Resistance exercises |
Nutritionist consult Check for underlying conditions Monitor weight gain |
| Normal Weight | Balanced diet Portion control Nutrient diversity |
150 min moderate exercise/week Strength training 2x/week Flexibility exercises |
Annual check-ups Monitor trends Preventive care |
| Overweight | Calorie deficit Reduce processed foods Increase fiber |
300 min exercise/week Cardio focus Daily activity increase |
Regular monitoring Screen for comorbidities Dietitian referral |
| Obese | Structured meal plan Professional guidance Behavioral changes |
Supervised program Gradual intensity increase Daily walking |
Medical supervision Comprehensive assessment Multidisciplinary team |
BMI and Disease Risk
- Heart Disease: Risk increases significantly with BMI over 25
- Type 2 Diabetes: BMI over 30 increases risk by 80-90%
- Hypertension: Each 5-unit BMI increase raises risk by 30%
- Certain Cancers: Breast, colon, kidney cancers linked to high BMI
- Sleep Apnea: Very common with BMI over 30
- Osteoarthritis: Weight stresses joints, increasing risk
- Fertility Issues: Both high and low BMI can affect fertility