BMI Calculator

Calculate your Body Mass Index (BMI) and assess your weight status.

BMI Settings
Your BMI Result
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Your BMI result will appear here

BMI Calculator - Body Mass Index Calculator Online Free

Free BMI calculator online. Calculate your Body Mass Index instantly — enter your height and weight to find out if you are underweight, healthy, or overweight.

❤️ BMI Calculator - Body Mass Index Calculator Online Free

Calculate your BMI to determine if you're in a healthy weight range. Quick, easy, with detailed health insights!

Accurate BMI

WHO standard formula

Any Units

kg/lbs, cm/feet supported

Category Display

Underweight/Normal/Overweight/Obese

Private

No data stored or shared

BMI Categories Explained

Underweight

BMI < 18.5

May indicate malnutrition or health issues. Consult doctor for weight gain plan.

Normal Weight

BMI 18.5 - 24.9

Healthy weight range! Maintain balanced diet and regular exercise.

Overweight

BMI 25 - 29.9

Increased health risk. Consider diet changes and more physical activity.

Obese

BMI ≥ 30

High health risk. Medical consultation recommended for weight management plan.

How BMI is Calculated

BMI Formula:
BMI = weight (kg) ÷ [height (m)]²

Example: Weight 70kg, Height 1.75m
BMI = 70 ÷ (1.75 × 1.75) = 70 ÷ 3.0625 = 22.86 (Normal weight)

Metric System (kg, m)

BMI = kg / m²

  • Weight in kilograms (kg)
  • Height in meters (m) or centimeters (cm)
  • Most common worldwide
Imperial System (lbs, ft/in)

BMI = 703 × lbs / in²

  • Weight in pounds (lbs)
  • Height in inches (in) or feet/inches
  • Common in USA

When to Use BMI Calculator

Fitness Tracking
  • Monitor weight loss/gain progress
  • Set realistic fitness goals
  • Track effectiveness of diet/exercise plan
  • Motivation during transformation journey
Health Assessment
  • Regular health check-ups
  • Insurance medical evaluations
  • Pre-employment health screening
  • Pregnancy planning (pre-conception health)
Nutrition Planning
  • Determine calorie needs based on BMI category
  • Work with dietitian for meal planning
  • Identify need for nutritional intervention
  • Monitor eating disorder recovery
Sports & Athletics
  • Athlete weight classification
  • Optimal performance weight determination
  • Team sports fitness requirements
  • Bodybuilding competition prep

Frequently Asked Questions

BMI has limitations:

  • Doesn't distinguish: Muscle vs fat (athletes may have high BMI but low body fat)
  • Age factor: Elderly may have normal BMI but high body fat (sarcopenia)
  • Ethnicity: Asian populations have higher health risks at lower BMI
  • Pregnancy: Not applicable for pregnant women
  • Children: Use age/gender-specific BMI percentiles for under 18
  • Better approach: Combine BMI with waist circumference, body fat %, overall health

WHO recommended ranges:

  • Normal Range: 18.5 - 24.9 (lowest health risk)
  • Ideal for Most Adults: 20-22 (optimal longevity)
  • Asian Populations: 18.5-23 (lower cutoff due to higher diabetes/CVD risk)
  • Seniors (65+): 23-27 (slightly higher may be protective)
  • Important: Individual targets vary based on genetics, muscle mass, health conditions

Benefits

Why Calculate BMI?
  • Quick Health Indicator: Instant snapshot of weight status
  • Disease Risk Assessment: Identify risk for diabetes, heart disease, hypertension
  • Goal Setting: Establish target weight range
  • Progress Tracking: Monitor changes over time
  • Free & Private: No cost, no judgment, confidential
Tool Features
  • Dual Units: Metric (kg/cm) and Imperial (lbs/ft)
  • Color-Coded Results: Easy-to-understand visual feedback
  • Detailed Interpretation: Health implications explained
  • Mobile-Friendly: Calculate on phone, tablet, desktop
  • 100% Free: Unlimited calculations, no registration

Calculate Your BMI Now!

Know your healthy weight range—free forever!