BMI Calculators for Adults

How to Calculate BMI (kg & cm) – Free Calculator with Results Chart

BMI Calculator: Check Your Body Mass Index Now

Find out if you’re in the healthy range with our accurate BMI calculator (kg/cm or lbs/ft). Get instant results with WHO-standard categories.

Calculate Your BMI Now

How to Calculate BMI Manually

Formula: BMI = weight (kg) ÷ (height (m) × height (m))

Example: For 70kg and 175cm (1.75m):
70 ÷ (1.75 × 1.75) = 22.9 (Healthy range)

Or use our calculator below for instant results!

BMI Calculator

Enter your details to calculate your Body Mass Index

Weight (kg)

Height (cm)

Your BMI Result

—

Underweight Normal Overweight Obese

16 18.5 25 30 40

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BMI Calculator FAQs

What is a good BMI score?

According to WHO standards:

Under 18.5: Underweight
18.5-24.9: Normal weight
25-29.9: Overweight
30 and above: Obese

However, BMI is just one indicator of health and doesn’t account for muscle mass or body composition.

How accurate is this BMI calculator?

Our calculator uses the standard BMI formula recognized by the World Health Organization (WHO). It provides accurate results based on the height and weight you enter. For medical purposes, always consult a healthcare professional.

Why does BMI matter for health?

BMI is a quick screening tool that can indicate whether you’re at a healthy weight for your height. Higher BMI values are associated with increased risk for conditions like heart disease, diabetes, and high blood pressure, while very low BMI may indicate malnutrition.

What are the limitations of BMI?

BMI doesn’t distinguish between muscle and fat, so athletes with high muscle mass may have a high BMI without excess fat. It also doesn’t account for fat distribution, which can affect health risks. For a complete health assessment, consult your doctor.

BMI Classification Chart (CDC/NIH/WHO Standards) (For Adults 20+ Years) BMI Range Weight Status (CDC/NIH) WHO Classification Below 18.5 Underweight Underweight 18.5 – 24.9 Healthy Weight Normal range 25.0 – 29.9 Overweight Pre-obese 30.0 – 34.9 Obesity (Class 1) Obese (Class I) 35.0 – 39.9 Obesity (Class 2) Obese (Class II) 40.0+ Severe Obesity (Class 3) Obese (Class III)

BMI Categories for Adults (CDC Standard)

BMI Range	Weight Status	Health Risk
Below 18.5	Underweight	High nutritional risk
18.5 – 24.9	Healthy Weight	Lowest risk
25.0 – 29.9	Overweight	Increased risk
30.0 and Above	Obesity	High risk

Source: Centers for Disease Control and Prevention

WHO vs CDC BMI Standards Comparison

BMI Range	CDC Classification	WHO Classification
< 16.0	–	Severe Thinness
16.0 – 16.9	–	Moderate Thinness
17.0 – 18.4	Underweight	Mild Thinness
18.5 – 24.9	Healthy Weight	Normal Range
25.0 – 29.9	Overweight	Pre-obese
≥ 30.0	Obesity	Obese

Note: WHO provides more granular underweight categories. WHO Guidelines

⚠️ Disclaimer: BMI is a screening tool only. It doesn’t measure body fat directly. Consult a healthcare provider for personalized assessment.

NIH BMI Classification

BMI	Weight Status
Below 18.5	Underweight
18.5 – 24.9	Normal Weight
25.0 – 29.9	Overweight
30.0+	Obesity

Source: NIH

BMI Standards: WHO vs. CDC vs. NIH

BMI Range	WHO	CDC	NIH
< 16.0	Severe Thinness	Underweight	Underweight
16.0 – 18.4	Moderate Thinness	Underweight	Underweight
18.5 – 24.9	Normal	Healthy Weight	Normal Weight
25.0 – 29.9	Overweight	Overweight	Overweight
30.0 – 34.9	Obesity I	Obesity	Obesity
35.0 – 39.9	Obesity II	Severe Obesity	Severe Obesity
≥ 40.0	Obesity III	Morbid Obesity	Morbid Obesity

Sources: WHO | CDC | NIH

“If you don’t find the desired unit, go to a unit converter, search for the measurement, and try again. Thank you.”

BMI Calculator – Calculate Your Body Mass Index Accurately

What Is a BMI Calculator?

A BMI calculator is a simple yet powerful tool that helps you determine your Body Mass Index (BMI), a measurement that assesses whether your weight is healthy for your height. Whether you’re tracking fitness progress, managing weight goals, or monitoring health risks, our BMI calculator provides instant results based on World Health Organization (WHO) standards.

Why Calculate BMI?

Your BMI is a useful indicator of whether you fall into a healthy weight range. Doctors and health professionals use BMI to screen for potential weight-related health risks, including:

Underweight (BMI < 18.5) – May indicate malnutrition or other health concerns

Normal weight (BMI 18.5–24.9) – Ideal range for most adults

Overweight (BMI 25–29.9) – Increased risk of developing weight-related conditions

Obese (BMI ≥ 30) – Higher risk of heart disease, diabetes, and other health issues

By using our BMI calculator, you can quickly calculate BMI and understand where you stand on the health spectrum.

BMI Categories Explained

BMI Range	Category	Health Risk
< 18.5	Underweight	Possible malnutrition
18.5–24.9	Normal (Healthy)	Low risk
25–29.9	Overweight	Moderate risk
≥ 30	Obese	High risk

How to Calculate BMI ?

Calculating your BMI is simple with our tool. Just follow these steps:

Select Your Preferred Units – Choose between kilograms (kg) & centimeters (cm), pounds (lbs) & inches (in), or other available options.

Enter Your Weight and Height – Input your current weight and height.

Click “Calculate BMI” – Our BMI calculator instantly computes your result.

Check Your BMI Category – See whether you’re underweight, normal weight, overweight, or obese.

Our BMI calculator also includes a visual gauge, making it easy to see where your BMI falls on the WHO scale.

Who Should Use This BMI Calculator?

Our BMI calculator is perfect for:

✅ Adults – Check if your weight is within a healthy range.
✅ Athletes & Fitness Enthusiasts – Monitor weight changes and fitness progress.
✅ Doctors & Nutritionists – Quickly assess patient health metrics.
✅ Anyone Focused on Health – Stay informed about your body composition.

Is BMI Accurate for Everyone?

While BMI is a useful screening tool, it doesn’t account for muscle mass, bone density, or fat distribution. Athletes with high muscle mass may have a higher BMI without being overweight. Similarly, older adults may have lower muscle mass, affecting results. For a complete health assessment, consult a healthcare provider.

Benefits of Our BMI Calculator

✔ Multiple Unit Options – Works with kg, lbs, cm, ft, in, and stone.
✔ WHO-Compliant Results – Uses official BMI classifications.
✔ Visual BMI Gauge – See your result on a color-coded scale.
✔ Mobile & Desktop Friendly – Works perfectly on phones, tablets, and computers.
✔ No Sign-Up – Free and easy to use.

Start Calculating Your BMI Today!

Whether you’re on a weight loss journey, maintaining fitness, or just curious about your health, our BMI calculator provides quick, accurate results. Calculate BMI now and take the first step toward better health awareness!

Maintaining a healthy weight is essential for overall well-being, and BMI is a helpful tool to assess if you’re on track. By calculating your Body Mass Index, you gain insight into potential health risks linked to weight. Whether you aim to lose, gain, or maintain weight, knowing your BMI helps set realistic goals. However, remember that BMI is a general guide—it doesn’t account for muscle mass or body composition. For a complete health picture, pair BMI with other metrics like waist circumference and body fat percentage. Stay proactive about your health by using tools like our BMI calculator to make informed decisions.

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