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BMI Calculator

Calculate your Body Mass Index (BMI) to assess your weight status. BMI is a measure of body fat based on height and weight.

Enter your weight and height to see your BMI.

BMI is a screening estimate, not a diagnosis. It doesn’t account for muscle mass, age or body composition.

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Calculate Your Body Mass Index (BMI) Accurately

Our free BMI calculator helps you determine your Body Mass Index (BMI), a measure of body fat based on your height and weight. BMI is a useful screening tool to assess weight status and potential health risks associated with being underweight, overweight, or obese.

What is BMI?

BMI (Body Mass Index) is a calculation that uses your height and weight to estimate body fat. It's calculated by dividing your weight in kilograms by your height in meters squared (BMI = kg/m²). While BMI doesn't directly measure body fat, it provides a reliable indicator of body fatness for most people.

BMI Categories

  • Underweight: BMI below 18.5 - May indicate being underweight, which can have health implications.
  • Normal Weight: BMI 18.5 to 24.9 - Generally considered a healthy weight range.
  • Overweight: BMI 25.0 to 29.9 - Above the healthy weight range, may increase health risks.
  • Obese: BMI 30.0 and above - Classified as obesity, associated with increased health risks.

How to Use the Calculator

  1. Select your preferred unit system (Metric or Imperial).
  2. Enter your weight (kg or lbs).
  3. Enter your height (cm or ft/in).
  4. Click "Calculate BMI" to get your results.
  5. View your BMI score, category, healthy weight range, and personalized recommendations.

Understanding Your Results

After calculating your BMI, you'll receive:

  • BMI Score: Your calculated Body Mass Index (rounded to one decimal place).
  • Category: Your weight status classification (Underweight, Normal, Overweight, or Obese).
  • Healthy Weight Range: The recommended weight range for your height.
  • Recommendations: Personalized advice based on your BMI category.

Limitations of BMI

It's important to understand that BMI has limitations:

  • BMI doesn't distinguish between muscle mass and fat mass, so athletes with high muscle mass may have a high BMI despite being healthy.
  • BMI doesn't account for bone density, age, gender, or muscle distribution.
  • BMI may not be accurate for children, teenagers, pregnant women, or elderly individuals.
  • BMI doesn't measure body fat percentage or distribution.

When to Consult a Healthcare Professional

While BMI is a useful screening tool, it's not a diagnostic tool. Consider consulting a healthcare provider if:

  • Your BMI is in the underweight category and you're experiencing health issues.
  • Your BMI is in the overweight or obese category and you want to create a weight management plan.
  • You're an athlete or have high muscle mass.
  • You're pregnant or elderly.
  • You have concerns about your weight or health.

Tips for Maintaining a Healthy Weight

  • Balanced Diet: Eat a variety of nutrient-dense foods in appropriate portions.
  • Regular Exercise: Aim for at least 150 minutes of moderate-intensity exercise per week.
  • Stay Hydrated: Drink plenty of water throughout the day.
  • Get Enough Sleep: Aim for 7-9 hours of quality sleep per night.
  • Manage Stress: Practice stress-reduction techniques like meditation or yoga.
  • Monitor Progress: Track your weight and BMI regularly, but don't obsess over daily fluctuations.

Formula Used

Our calculator uses the standard BMI formula:

  • Metric: BMI = weight (kg) / height (m)²
  • Imperial: BMI = (weight (lbs) × 703) / height (in)²

For example, if you weigh 70 kg and are 175 cm tall:
Height in meters = 175 / 100 = 1.75 m
BMI = 70 / (1.75 × 1.75) = 70 / 3.0625 = 22.9

Frequently asked questions

How do I calculate my BMI?

Enter your weight and height in the calculator. Select metric (kg, cm) or imperial (lbs, ft/in) units. Click 'Calculate BMI' to get your BMI score, category, healthy weight range, and recommendations.

What is a healthy BMI?

A healthy BMI is typically between 18.5 and 24.9. This is considered the normal weight range. However, BMI is a screening tool and doesn't account for muscle mass, age, or other factors. Consult a healthcare provider for personalized advice.

What does BMI mean?

BMI stands for Body Mass Index. It's a measure of body fat based on height and weight. BMI categories are: Underweight (below 18.5), Normal (18.5-24.9), Overweight (25-29.9), and Obese (30 and above).

Is BMI accurate for everyone?

BMI is a useful screening tool but has limitations. It doesn't distinguish between muscle and fat, so athletes may have high BMI despite being healthy. It also doesn't account for age, gender, bone density, or body fat distribution. Consult a healthcare provider for personalized assessment.

Can I use BMI calculator for children?

BMI calculations for children and teenagers require age and gender-specific charts. This calculator is designed for adults (18 years and older). For children, consult a pediatrician or use age-appropriate BMI calculators.

How often should I check my BMI?

BMI can be checked periodically, but daily monitoring isn't necessary as weight naturally fluctuates. Monthly checks are typically sufficient for tracking progress. Focus on overall health trends rather than day-to-day changes.