Check your Body Mass Index and find your ideal healthy weight range instantly.
The BMI Calculator by GrowthSyntax is a free, browser-based health tool that calculates your Body Mass Index from your height and weight — with support for both metric (kg/cm) and imperial (lbs/ft/in) measurements. It displays your BMI score, weight category (Underweight, Normal, Overweight, or Obese), a visual BMI scale indicator, and your ideal healthy weight range — all instantly, with no sign-up required.
Body Mass Index (BMI) is a numerical value calculated from a person's height and weight that is used as a general screening tool to categorize body weight relative to height. It is calculated by dividing weight in kilograms by height in meters squared (kg/m²), or using the equivalent imperial formula. The World Health Organization classifies BMI into four categories: Underweight (below 18.5), Normal weight (18.5–24.9), Overweight (25–29.9), and Obese (30 and above). BMI is widely used in clinical settings and public health research as an initial indicator of potential weight-related health risks.
The ideal healthy weight range is the range of body weights that corresponds to a BMI between 18.5 and 24.9 for a given height. For example, a person who is 175 cm tall has an ideal weight range of approximately 56.7 kg to 76.4 kg. Staying within this range is associated with lower risk of cardiovascular disease, type 2 diabetes, and other weight-related conditions. The BMI Calculator automatically calculates and displays your personalized ideal weight range in both kilograms and pounds depending on your selected measurement system.
Switch between metric (kilograms and centimeters) and imperial (pounds, feet, and inches) measurement systems with one click — covering users worldwide.
Classifies your BMI into the four standard World Health Organization categories — Underweight, Normal Weight, Overweight, and Obese — with color-coded display.
An animated arrow indicator moves along a color-coded BMI scale bar — showing exactly where your BMI falls across the four weight categories at a glance.
Automatically calculates and shows your personalized ideal healthy weight range based on your height — in kg or lbs depending on your selected unit system.
Results update instantly as you type your height and weight — no need to press calculate manually. Each change immediately recalculates your BMI and category.
The BMI Calculator runs entirely in your browser. No health data is sent to any server — your weight and height figures stay completely private at all times.
Stop guessing whether your weight is healthy for your height. Use the BMI Calculator by GrowthSyntax to check your Body Mass Index, see your WHO weight category, and find your ideal healthy weight range — completely free, instantly accurate, and always private.