Free BMI Calculator to check your Body Mass Index instantly.

💠

BMI Calculator

Enter height & weight, press Calculate — the gauge shows your BMI and category.

Age

Gender Male Female Other Height

cm ft/in

5 ft 11 in

180 cm

Weight

kg lbs

—

—

Enter values and press Calculate

Healthy range: 18.5 - 24.9

Weight for height (approx): —

BMI Calculator: Complete Guide to Body Mass Index, Health & Fitness

What is BMI?

Body Mass Index (BMI) is a number calculated from your height and weight. It’s a quick way to know if your weight is in a healthy range.

Why Use a BMI Calculator?

• Simple & free health check
• Identifies underweight, normal, overweight, or obesity
• Helps track fitness & weight goals

BMI Categories (WHO)

BMI Value	Category
Below 18.5	Underweight
18.5 – 24.9	Normal Weight
25 – 29.9	Overweight
30 & above	Obesity

Tips to Maintain Healthy BMI

• Eat balanced meals
• Exercise at least 150 minutes/week
• Stay hydrated
• Sleep 7–9 hours

  BMI Calculator: Complete Guide to Body Mass Index with Free Online Tool

  Introduction

  In today’s health-conscious world, everyone wants to track their fitness, weight, and overall wellness. One of the most popular tools for understanding your body weight in relation to your height is the BMI Calculator.
  BMI stands for Body Mass Index. It is a quick method to check whether a person is underweight, normal weight, overweight, or obese. Health experts, doctors, and nutritionists use BMI as a simple indicator to assess overall health risks related to weight.

  In this blog, we will cover everything you need to know about BMI Calculator, including its meaning, formula, chart, advantages, limitations, and how you can use it online for free.

  ---

  What is BMI (Body Mass Index)?

  BMI, or Body Mass Index, is a number derived by dividing your weight (in kilograms) by the square of your height (in meters).
  It helps determine whether your weight is healthy according to your height.

• If BMI is too low → you may be underweight.
• If BMI is too high → you may be overweight or obese.
• If BMI is in the middle → you are likely in the healthy weight range.
• SEO Keywords to target: BMI calculator, body mass index calculator, BMI chart, BMI formula, BMI online calculator, healthy weight calculator.

  ---

  BMI Formula

  The BMI formula can be calculated in two ways depending on the measurement system:

  Metric System (kg/m²)

  $$BMI = \frac{Weight (kg)}{Height (m)^2}$$

  Imperial System (lbs/in²)

  $$BMI = \frac{Weight (lbs) \times 703}{Height (in)^2}$$

  ---

  BMI Categories (WHO Standards)

  The World Health Organization (WHO) classifies BMI ranges as follows:

  Category	BMI Range
  Underweight	Less than 18.5
  Normal weight	18.5 – 24.9
  Overweight	25 – 29.9
  Obese (Class I)	30 – 34.9
  Obese (Class II)	35 – 39.9
  Obese (Class III)	40 and above

  ---

  Why Use a BMI Calculator?

1. Quick health check – It takes only seconds to know your weight status.
2. Early warning – High BMI may indicate risks like diabetes, hypertension, or heart problems.
3. Weight management – Helps set fitness goals.
4. Universal tool – Used by doctors, gyms, schools, and researchers.

• ---

  How to Use a BMI Calculator Online?

  Using a BMI Calculator tool is very simple:

1. Enter your weight (kg or lbs).
2. Enter your height (cm, m, or inches).
3. Click “Calculate”.

4. The calculator will instantly show your BMI value and the weight category (underweight, normal, overweight, or obese).

• ✅ Pro Tip: Bookmark a BMI calculator tool on your device for easy tracking.

---

Example of BMI Calculation

• Person A: Weight = 70 kg, Height = 1.75 m

$$BMI=\frac{70}{1.75\times 1.75}=22.9$$

This person falls into the normal weight category.

---

BMI Chart by Age and Gender

Although BMI formula is the same for all adults, interpretation may slightly vary based on age, gender, and body type.

• Men: Higher muscle mass may increase BMI without extra fat.
• Women: Hormonal changes can affect fat storage.
• Children & Teens: Use percentile charts (age- and gender-specific).

---

Limitations of BMI

While the BMI Calculator is useful, it has certain limitations:

• Does not distinguish between muscle and fat.
• May not be accurate for athletes with high muscle mass.
• Not suitable for pregnant women.
• Elderly people may have different fat distribution.

That’s why BMI should be used along with waist-to-hip ratio, body fat percentage, and overall health checkups.

---

BMI and Health Risks

• Underweight → Malnutrition, weakened immunity, osteoporosis.
• Overweight → High cholesterol, joint pain, sleep apnea.
• Obesity → Type 2 diabetes, heart disease, stroke, certain cancers.
• Maintaining a healthy BMI reduces long-term health risks.

---

How to Maintain a Healthy BMI?

1. Balanced Diet – Eat fruits, vegetables, whole grains, lean proteins.
2. Regular Exercise – At least 150 minutes of physical activity per week.
3. Stay Hydrated – Drink 8–10 glasses of water daily.
4. Adequate Sleep – 7–8 hours of quality sleep.
5. Regular Checkups – Track BMI, blood sugar, and blood pressure.
6. BMI Calculator for Men vs Women

• While the formula is the same, fat distribution differs:

  Men: More muscle → BMI may be slightly higher.

  Women: Naturally higher fat percentage → BMI category may show overweight even if fit.

  ---

  BMI Calculator for Children

  For kids (2–18 years), BMI is measured differently:

• BMI is compared with growth charts.
• Percentile is used:
• Below 5th percentile = underweight.
• 5th – 85th percentile = healthy weight.
• Above 85th = overweight.
• Above 95th = obese.
• ---

  Online Free BMI Calculator Tool

  Many websites and apps provide free BMI Calculator tools. You simply input your weight and height, and results are displayed instantly. For bloggers, adding a BMI Calculator widget to a health blog can improve user engagement and SEO.

• BMI Calculator Online Free
• Body Mass Index Chart
• Healthy Weight Calculator
• BMI for Men and Women
• BMI for Children
• Calculate BMI by Height and Weight
• Ideal Weight Calculator

• ---

  FAQs About BMI Calculator

  1. What is a healthy BMI range?

  18.5 – 24.9 is considered healthy.

  2. Can BMI be wrong?

  Yes, especially for athletes, pregnant women, or elderly people.

  3. Is BMI the same for men and women?

  Formula is same, but interpretation differs slightly.

  4. What is the BMI formula in kg and cm?

  $$BMI = \frac{Weight (kg)}{(Height (cm)/100)^2}$$

  5. Can I calculate BMI without a calculator?

  Yes, using formula manually, but online tools are easier.

  ---

  Conclusion

  A BMI Calculator is a powerful, quick, and easy-to-use tool for checking your body weight status. It gives a general picture of whether you are underweight, healthy, overweight, or obese. While it is not 100% accurate for everyone, it remains one of the most widely used health indicators worldwide.

  By maintaining a healthy BMI through diet, exercise, and lifestyle, you can reduce the risk of chronic diseases and improve your overall wellness.

  👉 Use our free BMI calculator online today to find out your status and take your first step toward a healthier future.