How to Calculate BMI (Step-by-Step Guide with Formula)

Calculating BMI (Body Mass Index) is simple and helps you understand whether your weight is healthy for your height. In this guide, you’ll learn the exact formula and step-by-step method to calculate BMI accurately.

BMI Formula

You need your weight in kilograms and height in meters to calculate BMI.

Step-by-Step BMI Calculation

1. Measure your weight in kilograms (kg)
2. Measure your height in meters (m)
3. Square your height (Height × Height)
4. Divide weight by squared height

Example

Weight: 65 kg

Height: 1.7 m

• Height² = 1.7 × 1.7 = 2.89
• BMI = 65 ÷ 2.89 = 22.49
• BMI ≈ 22.5 (Normal weight)

BMI Categories

Quick Tips

• Always use accurate height and weight
• Convert height to meters if needed
• Use a calculator for precise results

Use Online BMI Calculator

Manual calculation is helpful for understanding, but you can instantly calculate your BMI using our tool:

Conclusion

BMI calculation is quick and useful for tracking your health. By following the simple formula and steps, you can easily determine your BMI and understand your weight category.