What is Body Mass Index (BMI)?

BMI is an established screening metric used by the World Health Organization (WHO) to categorize body mass based on height and weight.

What are the standard adult BMI categories?

Underweight (< 18.5), Normal weight (18.5 – 24.9), Overweight (25.0 – 29.9), and Obese (≥ 30.0).

No, BMI is a general screening indicator. It does not measure body fat percentage directly or account for muscle density.

Calculators 100% Free & Privacy-First

Underweight (< 18.5), Normal weight (18.5 – 24.9), Overweight (25.0 – 29.9), and Obese (≥ 30.0).

No, BMI is a general screening indicator. It does not measure body fat percentage directly or account for muscle density.

Calculate your Body Mass Index (BMI) using metric or imperial units and check standard WHO weight category ranges.

BMI Calculator Interactive Workspace

Client-side calculations and instant parameter controls are initializing. All processing occurs securely in your browser.

1 Choose between Metric (cm, kg) or Imperial (ft/in, lbs) measurement units.
2 Enter your current height and body weight.
3 Instantly view your calculated BMI score, standard category classification, and recommended healthy weight range.

BMI = Weight (kg) / [Height (m)]² | Imperial: BMI = 703 × Weight (lbs) / [Height (in)]²

Calculations are performed with IEEE floating point mathematical precision directly in your device memory.

Input: Height: 175 cm (1.75 m), Weight: 70 kg

Result: BMI: 22.86 kg/m² (Normal Weight)

70 / (1.75 × 1.75) = 22.86 kg/m²

Input: Height: 5 ft 10 in (70 in), Weight: 160 lbs

Result: BMI: 22.95 (Normal Weight)

(703 × 160) / (70 × 70) = 22.95

What is Body Mass Index (BMI)?: BMI is an established screening metric used by the World Health Organization (WHO) to categorize body mass based on height and weight.
What are the standard adult BMI categories?: Underweight (< 18.5), Normal weight (18.5 – 24.9), Overweight (25.0 – 29.9), and Obese (≥ 30.0).
Is BMI an accurate medical diagnosis?: No, BMI is a general screening indicator. It does not measure body fat percentage directly or account for muscle density.

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