Free Online BMI Calculator
Calculate your Body Mass Index instantly. Supports metric (kg/cm) and imperial (lbs/ft) units. Includes BMI chart, health categories, ideal weight range and health tips.
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⚖️ Enter Your Measurements
Press Enter in any field to calculate
<18.5 Normal
18.5–24.9 Overweight
25–29.9 Obese
>30
| Category | BMI Range | Risk |
|---|---|---|
| Underweight | < 18.5 | Moderate |
| Normal Weight | 18.5 – 24.9 | Low |
| Overweight | 25.0 – 29.9 | Moderate |
| Obese Class I | 30.0 – 34.9 | High |
| Obese Class II+ | ≥ 35.0 | Very High |
How to Use the Toolzey BMI Calculator
Calculating your BMI takes less than 30 seconds:
- Select your unit system — Choose Metric (kg/cm) or Imperial (lbs/ft/in) using the toggle above.
- Enter your weight and height — Type your measurements into the fields. You can also optionally add age and gender for additional context.
- Click "Calculate My BMI" — Your BMI score, category, ideal weight range and visual scale appear instantly.
What is BMI and What Does It Mean?
BMI (Body Mass Index) is a numerical value calculated from your height and weight. It provides a simple, quick screening measure for categorising weight status. The WHO defines four main BMI categories for adults:
- Underweight (BMI < 18.5): May indicate malnutrition, eating disorders or other health issues. Consult a doctor.
- Normal weight (18.5–24.9): Associated with the lowest health risks for most adults. Aim to maintain this range.
- Overweight (25.0–29.9): Modestly increased risk of cardiovascular disease, type 2 diabetes and other conditions.
- Obese (≥ 30.0): Significantly increased risk of serious health conditions. Medical guidance is recommended.
Important note: BMI is a population-level screening tool. It does not account for muscle mass, bone density, age, ethnicity, or body fat distribution. Athletes and bodybuilders may show a "high" BMI while being in excellent health. Always consult a qualified healthcare professional for a complete health assessment.