How to calculate BMI calculator?

BMI estimates body fat by comparing weight to height and helps classify weight status for most adults.

First convert height from centimetres to metres, then use the formula: BMI = weight_kg / (height_m × height_m)

Using the BMI calculator calculator: an example

Example values: weight = 70 kg, height = 170 cm.

Step-by-step calculation:

1. Convert height: 170 cm → 1.70 m (170 / 100 = 1.70).
2. Compute BMI: 70 ÷ (1.70 × 1.70) = 70 ÷ 2.89 ≈ 24.22.
3. Round the result: BMI ≈ 24.2.
4. Interpret: 24.2 is classified as Normal weight (18.5–24.9).

Frequently Asked Questions

What do BMI categories mean?

BMI categories indicate weight ranges linked to health risk: underweight, normal, overweight, and obesity; higher BMI generally means higher risk.

Is BMI accurate for muscular people?

BMI can overestimate body fat in very muscular individuals; use body composition measures or waist circumference for better assessment.

How should I use BMI results?

Use BMI as a screening tool, not a diagnosis; discuss results with a healthcare professional who can consider age, sex, and muscle mass.