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Calculate Body Mass Index (BMI), determine weight category classification, and compute target healthy weight ranges.
You are within the healthy weight range for your height.
18.5 – 24.9
56.7 kg – 76.3 kg
0.91
Official adult weight classification thresholds and corresponding health risk assessments.
| Classification Category | BMI Range (kg/m²) | Weight Range for Height | Status |
|---|---|---|---|
| Underweight | < 18.5 | < 56.7 kg | |
| Normal Weight | 18.5 – 24.9 | 56.7 – 76.3 kg | YOUR CATEGORY |
| Overweight | 25.0 – 29.9 | 76.6 – 91.6 kg | |
| Obesity (Class I) | 30.0 – 34.9 | 91.9 – 106.9 kg | |
| Obesity (Class II) | 35.0 – 39.9 | 107.2 – 122.2 kg | |
| Severe Obesity (Class III) | ≥ 40.0 | ≥ 122.5 kg |
Official summary of entered body measurements, calculated BMI index, and healthy weight benchmarks.
Print BMI screening results, export category data to CSV/JSON, or copy summary notes.
Formulas Used for Computation:
Clinical Screening Context:
For a height of 175 cm and weight of 70 kg, the Body Mass Index is 22.86. This falls into the "Normal Weight" classification (standard healthy adult range: 18.5 – 24.9).
| Body Measurement Scenario | Computed BMI & Category |
|---|---|
| weight : 70, height : 175, system : metric | BMI Score: 22.86 (Normal Weight) |
Body Mass Index (BMI) & Weight Category Calculator. Calculate your Body Mass Index (BMI), WHO weight classification, and healthy weight range based on height and body weight. ZechKit provides this tool completely free and online, optimized for instant, accurate computations directly inside your web browser.
Body Mass Index (BMI) is a standardized screening metric established by the World Health Organization (WHO) to categorize body weight relative to height in adult men and women.
Formulas: Metric BMI = Weight (kg) / [Height (m)]^2. Imperial BMI = [Weight (lbs) × 703] / [Height (inches)]^2.
WHO Classifications: Underweight (BMI < 18.5), Normal/Healthy Weight (18.5 – 24.9), Overweight (25.0 – 29.9), Obese Class I (30.0 – 34.9), Obese Class II (35.0 – 39.9), and Obese Class III (≥ 40.0).
Clinical Context: While BMI serves as a useful population screening tool, it does not directly measure body fat percentage or muscle mass—athletes with high muscle density may register in the overweight category despite low body fat.
What is the standard formula for calculating Body Mass Index (BMI)?
BMI is calculated by dividing weight in kilograms by height in meters squared: BMI = kg / m² (or [lbs × 703] / inches² in imperial units).
