BMI Calculator
Calculate Body Mass Index before and during pregnancy
Body Mass Index (BMI) is one of the most widely used screening tools to assess whether your weight falls within a healthy range for your height. Our BMI calculator gives you an instant result along with your weight category.
While BMI doesn't account for muscle mass, bone density, or body composition, it remains a useful starting point for understanding general health risk and tracking changes over time.
How This Calculator Works
BMI is calculated using the formula: weight (kg) ÷ height (m)². Simply enter your height in centimeters and your weight in kilograms, and the calculator converts and computes your BMI instantly, placing it into a standard category — underweight, normal, overweight, or obese.
Why Use This Calculator
- Get your BMI instantly without manual calculations
- Understand which weight category you fall into
- Useful for tracking health trends over time
- Quick reference before consulting a doctor or nutritionist
Frequently Asked Questions
For most adults, a BMI between 18.5 and 24.9 is considered within the normal weight range, according to WHO standards.
Not entirely. BMI doesn't distinguish between muscle and fat, so athletes or very muscular individuals may show a higher BMI despite low body fat. It's also not designed for children, who need age-specific growth charts.
A BMI between 25 and 29.9 is generally classified as overweight, while 30 and above falls into the obese category.
Pre-pregnancy BMI is useful for determining recommended pregnancy weight gain ranges, but BMI shouldn't be used to assess weight status during pregnancy itself, since healthy weight gain is expected.
There's no strict rule, but checking every few months is reasonable for tracking general trends rather than day-to-day fluctuations.
BMI is a general screening tool and not a diagnostic measure of body fat or overall health. Consult a healthcare provider for personalized advice.