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BMI Calculator

Calculate your Body Mass Index (BMI) and check your official World Health Organization weight classification.

Body Mass Index Result
23.5
Normal weight

Your BMI is within the healthy weight category for adults according to the World Health Organization.

Estimated Normal Weight Range For Your Height

56.7 kg – 76.3 kg (125 lbs – 168.2 lbs)

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How It Works & Underlying Concept

Body Mass Index (BMI) is a screening tool used by healthcare organizations to estimate body fatness in adult men and women based on weight and height. While it does not directly measure body fat percentage, it correlates with metabolic health risk profiles in broad populations.

Mathematical Formula / RuleMetric: BMI = weight (kg) / [height (m)]² | Imperial: BMI = 703 × weight (lbs) / [height (in)]²
Quick Instructions
1Choose either Metric (kg / cm) or Imperial (lbs / ft & in) tab.
2Enter your weight and height values.
3Review your BMI score, category badge, and suggested healthy weight boundaries.

Key Capabilities

  • Supports both Metric (kg, cm) and Imperial (lbs, feet & inches)
  • Official World Health Organization classification breakdown
  • Custom healthy weight range calculation tailored to your height
  • BMI Prime index score for standardized ratio comparison
Real-World Example

Adult Fitness Baseline

An adult measuring 175 cm (5 ft 9 in) currently weighs 72 kg (158.7 lbs).

Step 1:Height in meters: 1.75 m.
Step 2:Calculate height squared: 1.75 × 1.75 = 3.0625.
Step 3:Divide weight by height squared: 72 / 3.0625 = 23.51.
Result: BMI is 23.5, placing the individual safely within the 'Normal weight' category.
Technical Notes & Limits
  • BMI does not distinguish between lean muscle mass and fat tissue.
  • Athletes and bodybuilders with high muscle mass may register as overweight or obese despite low body fat.
  • Not intended as a clinical diagnosis; consult a physician for medical evaluations.

Frequently Asked Questions

What is considered a normal healthy BMI?▾
The World Health Organization designates a BMI between 18.5 and 24.9 as the normal, healthy weight category for adults.
Is BMI accurate for senior adults or teenagers?▾
Elderly adults often benefit from slightly higher BMI margins to protect against frailty. For children and teens under 20, pediatric BMI percentiles based on age and sex must be used instead.

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