The Science Behind
WeightBMI Platform
At WeightBMI, we believe that BMI is the first step in your health journey. We provide accurate, globally recognized tools to assess your body composition.
WeightBMI Calc
The primary tool for accurate BMI analysis.
Ideal Weight
Know the weight you should aim to achieve.
Calorie Tracker
Your nutrition plan starts with knowing your TDEE.
What is BMI?
BMI is a global metric used by doctors at WeightBMI and worldwide to estimate body fat based on height and weight. It was developed as a quick and effective screening tool.
Regularly using WeightBMI helps you monitor your health status and avoid risks of obesity or underweight through our Health History feature.
How We Calculate It?
Metric System (kg/m)
weight (kg) / [height (m)]²Imperial System (lbs/in)
703 × weight (lbs) / [height (in)]²WHO BMI Classifications
Standard 2026 criteria for adults
| Range | Status | Health Risk |
|---|---|---|
| Below 18.5 | Underweight | Possible Risk |
| 18.5 – 24.9 | Healthy | Low Risk |
| 25.0 – 29.9 | Overweight | Increased Risk |
| 30.0 & Above | Obese | High Risk |
Important Notes
Despite WeightBMI's accuracy, BMI doesn't distinguish between muscle and fat. Athletes may get high scores due to muscle mass.