BMI Calculator — Body Mass Index Calculator for Women, Men, Teens & Kids
Welcome to our advanced bmi calculator — a tool that helps you calculate BMI (Body Mass Index) quickly and accurately. Whether you're a woman, man, teen, or child, our online BMI calculator is designed to guide you. It covers everything: bmi calculator women, bmi calculator men, bmi calculator for kids, and more.
Calculate Your BMI & Daily Calorie Needs
Understanding BMI (Body Mass Index)
BMI is a numerical value derived from your weight and height. It’s a simple measure to assess whether your weight is in a healthy range. When you calculate BMI, you're converting weight and height into a standard figure that healthcare professionals use to categorize weight status.
How to Calculate BMI
The formula is:
BMI = weight (kg) ÷ [height (m)]2
For example, weighing 70 kg and height 1.75 m:
BMI = 70 ÷ (1.75 × 1.75) ≈ 22.9
You might also see searches like "how do you calculate BMI", "calculate of BMI", "how is BMI calculated", "how to calculate my BMI", or "calculate BMI how." This tool covers all those intents in one place.
BMI Categories
- Underweight: BMI < 18.5
- Normal weight: BMI 18.5 – 24.9
- Overweight: BMI 25.0 – 29.9
- Obese: BMI ≥ 30.0
BMI Calculator for Women, Men, Children & Teens
Whether you want a bmi calculator female, bmi calculator male, bmi calculator for women, bmi calculator for men, or a calculator for younger ages — we've covered it. For children and teens, BMI is analyzed using percentile charts (so it's more than just a number). That’s why terms like child BMI calculator, teen BMI calculator, bmi percentile calculator are relevant.
Calories & Nutritional Needs Based on BMI
After you calculate your BMI, our system estimates your daily calorie needs using age, gender, height, weight, and activity level. This is based on the Mifflin‑St Jeor equation and a multiplier for daily activity.
How Calorie Needs Are Calculated
First, we get your BMR (Basal Metabolic Rate):
For men: 10 × weight + 6.25 × height – 5 × age + 5
For women: 10 × weight + 6.25 × height – 5 × age – 161
Then multiply by your activity level (1.2 to 1.9). That gives an estimate of your total daily energy expenditure (TDEE).
Examples
Example 1: Female, 25 years, 165 cm, 60 kg → BMI ≈ 22.0 → Normal weight
Example 2: Male, 30 years, 180 cm, 90 kg → BMI ≈ 27.8 → Overweight
Example 3: Child, 12 years, 150 cm, 45 kg → use child/teen BMI percentile charts
Limitations of BMI
BMI is a helpful screening tool but not perfect. It doesn’t distinguish between muscle vs fat or where fat is distributed. Bodybuilders may have high BMI yet low body fat. Pregnant women or very short/tall individuals may get misleading results.
Tips & Best Practices
- Use accurate height & weight measurements.
- Compare over time, not obsess on daily changes.
- Pair BMI with waist circumference or body fat %.
- Consult medical professionals for personalized advice.
FAQ
How do you calculate BMI?
You divide your weight in kilograms by your height in meters squared: BMI = weight ÷ (height × height).
Is the formula different for women and men?
No, the formula is the same, but interpretation may differ due to fat and muscle distribution.
Can I use this calculator for a child or teen?
Yes — for younger users we interpret BMI percentile charts, not just raw values.
What is a healthy BMI?
Typically, BMI between 18.5 and 24.9 is considered “normal weight.”
How accurate is BMI?
It’s a useful tool, but it can’t tell muscle vs fat or body fat distribution — consult a professional for deeper analysis.