Free BMI Calculator – Calculate Your Ideal Weight & Daily Calories
Instantly calculate your Body Mass Index (BMI), find your ideal weight range, and estimate daily calorie needs based on your lifestyle.
What is BMI (Body Mass Index)?
Body Mass Index (BMI) is a simple and widely used health indicator that measures your weight in relation to your height. It helps estimate whether you are underweight, normal weight, overweight, or obese. The BMI formula is:
BMI = weight (kg) ÷ [height (m)]².
This tool also provides your ideal weight range and daily calorie needs based on your age, gender, and activity level — helping you plan a healthier lifestyle.
Why BMI Calculation is Important (Who Uses It)
- Health & Fitness Enthusiasts:Track progress and maintain a healthy weight for better energy and endurance.
- Doctors & Nutritionists:Use BMI as a quick screening tool to assess weight categories and health risks.
- Everyday People:Understand their ideal weight and calorie requirements for better lifestyle decisions.
BMI Categories & What They Mean
| BMI Range | Category | Health Risks |
|---|---|---|
| Below 18.5 | Underweight | Malnutrition risk |
| 18.5 – 24.9 | Normal | Low risk (healthy) |
| 25 – 29.9 | Overweight | Moderate risk |
| 30 and above | Obese | High risk |
How to Use the BMI Calculator
- Enter your height in centimeters or feet-inches.
- Enter your weight in kilograms or pounds.
- Provide your age and gender for more accurate results.
- Select your activity level (e.g., sedentary, moderate, active).
- Click on “Calculate” to get your BMI, ideal weight range, and daily calorie needs.
Tip: For best accuracy, measure your height and weight in the morning on an empty stomach.
Activity Levels & Calorie Needs
Your daily calorie requirement depends on how active you are. Here’s a general guide:
- Sedentary: Little or no exercise
- Lightly Active: Light exercise/sports 1–3 days/week
- Moderately Active: Moderate exercise/sports 3–5 days/week
- Very Active: Hard exercise/sports 6–7 days/week
Frequently Asked Questions
For most adults, a BMI between 18.5 and 24.9 is considered healthy. A BMI below 18.5 may indicate underweight, while a BMI above 25 can indicate overweight or obesity, depending on other factors.
BMI values are the same for both men and women, but age, gender, muscle mass, and body fat distribution can influence overall health risks. Older adults may have more body fat than younger individuals with the same BMI.
To maintain a healthy BMI, aim for a balanced diet rich in whole foods, stay physically active, get enough sleep, and manage stress. Regular BMI checks help you track your progress effectively.
BMI is a useful screening tool but not a diagnostic measure. It doesn’t account for muscle mass, bone density, or body composition. Pair BMI with other health indicators like waist circumference and lifestyle factors for a more accurate picture.
