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BMI Calculator

Age

years

Gender

Male Female

Height

Weight

Limitations

BMI doesn't account for muscle mass, bone density, or distribution of fat.

Health Risks

Both underweight and overweight conditions can increase health risks.

BMI Result

Enter your information and click Calculate

18.5

Underweight

Normal

Overweight

Obesity

BMI Categories

Underweight

< 18.5

Increased health risk

Normal weight

18.5 - 24.9

Lowest health risk

Overweight

25 - 29.9

Moderate health risk

Obesity

≥ 30

High health risk

Limitations

BMI doesn't account for muscle mass, bone density, or distribution of fat.

Health Risks

Both underweight and overweight conditions can increase health risks.

Fitness & Health Calculators

What is body mass index, or BMI?

The body mass index, or BMI, is a number one gets from a simple formula that considers weight and height. use BMI Calculator, It’s a quick way to see where you stand on the weight scale and spot possible health risks. People all over the world use it. even the WHO (world health organization) and the NHS (National Health Service) rely on BMI, especially for adults above the age of 18.

How to Calculate BMI?

There are two ways to do the math, depending on the units you use:

1. Metric Units (kg and meters)

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

If weight = 70 kg, height = 1.70 m:

$BMI = \frac{70}{(1.70)^{2}} = \frac{70}{2.89} \approx 24.2$

2. Imperial Units (lbs and inches)

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

If weight = 154 lbs, height = 67 in:

$BMI = \frac{154 \times 703}{67^{2}} = \frac{108, 262}{4, 489} \approx 24.1$

That falls within the “normal” weight range.

BMI categories WHO & NHS

Here’s the Breakdown

BMI Range	Weight Category	Health Risk
Below 18.5	Underweight	Nutritional deficiency
18.5 – 24.9	Normal (Healthy)	Low risk
25 – 29.9	Overweight	Increased risk
30 – 34.9	Obese Class I	High risk
35 – 39.9	Obese Class II	Very high risk
40+	Obese Class III	Extremely high risk

Both WHO and NHS use this scale.

BMI for Men or BMI for women

The formula for BMI is the same for all, but sometimes numbers do not tell everything. More muscle can increase a man’s BMI even if he’s healthy, so it is wise to check body fat in addition to BMI.

For women, body fat is usually a higher percentage, so again, it takes into consideration age and lifestyle when reading BMI. Pregnancy would also call for a different approach.

Our BMI calculators use the official methods employed by WHO and NHS for men and women.

What’s a healthy BMI?

According to the guidelines of WHO and the NHS, it should range between 18.5 to 24.9 for most adults.

BMI versus Body Fat and Caloric Intake

BMI helps but can’t show how much fat you carry. If you want a fuller picture, try these tools:

Body Fat Calculator – displays the percentage of fat

Calorie Calculator – assists in determining daily calorie requirements

Ideal Weight Calculator – provides a healthy weight objective Use these together for the best result.

Why Use BMI?

NHS & WHO Advice According to the WHO, it is the global standard for checking obesity. The NHS utilizes it for assessing health risks in the UK. Tracking BMI prevents potential problems, such as heart disease, type 2 diabetes, and high blood pressure.