CalcMaster - Advanced Online Calculators

BMI Calculator

Calculate your Body Mass Index (BMI) to assess whether your weight is in a healthy range for your height. BMI is a useful screening tool for weight categories that may lead to health problems.

Measurement System

Metric (kg, cm) Imperial (lbs, in)

Height (cm)

Weight (kg)

Your BMI Results

Your BMI

24.2

Weight Category

Normal

Healthy Weight Range

56.7 - 76.6 kg

BMI Categories

BMI	Weight Status	Health Risk
Below 18.5	Underweight	Increased risk
18.5 - 24.9	Normal	Least risk
25.0 - 29.9	Overweight	Increased risk
30.0 - 34.9	Obese (Class I)	High risk
35.0 - 39.9	Obese (Class II)	Very high risk
40.0 and above	Extreme Obesity	Extremely high risk

Weight Goal Calculator

Calculate how much weight you need to gain or lose to reach a target BMI.

Target BMI

About BMI

Body Mass Index (BMI) is a person's weight in kilograms divided by the square of height in meters. BMI screens for weight categories that may lead to health problems.

BMI is a simple, inexpensive screening tool, but it doesn't measure body fat directly or account for factors like muscle mass.

Health Tips

Balanced Diet

Focus on whole foods, fruits, vegetables, lean proteins and whole grains.
Regular Exercise

Aim for at least 150 minutes of moderate activity per week.
Hydration

Drink plenty of water throughout the day.
Sleep

Get 7-9 hours of quality sleep each night.

Waist-to-Height Ratio

This ratio may be a better indicator of health risks than BMI alone.

Waist Circumference (cm)

Height (cm)

Understanding BMI and Your Health

Body Mass Index (BMI) is a widely used tool to categorize individuals based on their weight relative to their height. While it's a useful screening tool, it's important to understand both its benefits and limitations when assessing your health.

What BMI Measures

BMI is calculated by dividing a person's weight in kilograms by the square of their height in meters. The resulting number places individuals in categories ranging from underweight to obese. These categories correlate with certain health risks:

Underweight (BMI < 18.5): Increased risk of nutritional deficiencies and osteoporosis
Normal weight (BMI 18.5-24.9): Lowest risk of weight-related health problems
Overweight (BMI 25-29.9): Increased risk of developing heart disease, high blood pressure, and type 2 diabetes
Obese (BMI 30+): High risk of serious health conditions including stroke, certain cancers, and sleep apnea

Limitations of BMI

While BMI is a useful population-level screening tool, it has several limitations when assessing individual health:

Doesn't distinguish between muscle and fat (athletes may have high BMI without excess fat)
Doesn't account for fat distribution (abdominal fat is more dangerous than fat stored elsewhere)
May not be equally accurate across all ethnic groups
Doesn't consider age or sex differences in body composition

Beyond BMI: Other Health Indicators

For a more complete picture of your health, consider these additional measurements along with BMI:

Waist circumference: Measures abdominal fat (higher risk if >40" for men or >35" for women)
Waist-to-height ratio: Should be less than 0.5 for lowest health risks
Body fat percentage: Provides more accurate assessment of body composition
Blood pressure, cholesterol, and blood sugar levels: Important indicators of metabolic health