How to Calculate BMI (Step-by-Step Guide)
Calculating BMI is very simple and takes only a few seconds using the right formula. This guide explains how to calculate your BMI manually and how to interpret the results.
Step 1 – Measure Your Height
Measure your height in metres (m).
Examples:
- 1.60m
- 1.75m
- 1.82m
Step 2 – Measure Your Weight
Measure your weight in kilograms (kg).
Step 3 – Apply the Formula
BMI = Weight (kg) / Height² (m)
Example calculation
Weight = 70 kg
Height = 1.75 m
BMI = 70 / (1.75 × 1.75)
BMI = 22.86
Step 4 – Compare with BMI Chart
| BMI | Category |
| 18.5 – 24.9 | Healthy |
| 25 – 29.9 | Overweight |
| 30+ | Obese |
Our online calculator does this instantly — just enter your weight and height.
What Your Result Means
- Healthy BMI
Indicates that your weight is proportionate to your height. - Overweight BMI
Suggests increased health risk — lifestyle improvements may be needed. - Obese BMI
Higher chance of chronic health conditions.
How Often Should You Measure BMI?
For best tracking:
- Adults: once every 2–4 weeks
- Children: as part of medical check-ups
Conclusion:
BMI calculation is fast, simple, and helpful for understanding weight status. Use our online calculator for accurate results without performing manual maths.
