⚖️ Free Online Calculator

BMI Calculator — Calculate Body Mass Index Instantly

Calculate your Body Mass Index (BMI) in seconds using weight and height. Supports both centimeters and feet/inches. Includes visual BMI meter, health category and full formula explanation.

⚖️ BMI Calculator — Instant Free Calculator

Weight (kg)

Height

cmfeet

Your BMI

UnderweightNormalOverweightObese

📐 BMI Calculator Formula

BMI = Weight (kg) ÷ Height² (m)

Where height is measured in meters. Example: if height = 175cm, use 1.75m

BMI (Body Mass Index) is calculated by dividing a person's weight in kilograms by the square of their height in meters. This simple formula was developed by Belgian mathematician Adolphe Quetelet in the 1830s and remains the most widely used screening tool for weight categories worldwide.

For South Asians including Pakistanis, health experts recommend slightly lower BMI thresholds because South Asian populations tend to carry more visceral fat at the same BMI compared to Western populations.

📋 How to Calculate BMI Calculator Manually

1
Measure your weight in kilograms (kg). If you know your weight in pounds, divide by 2.205 to convert to kg.
2
Measure your height in meters (m). If your height is 175 cm, divide by 100 to get 1.75 m.
3
Square your height — multiply height by itself. Example: 1.75 × 1.75 = 3.0625
4
Divide your weight by height squared. Example: 70 ÷ 3.0625 = 22.86
5
Compare your result to the BMI categories table below to determine your health status.

BMI Range	Category	South Asian Standard	Health Risk
< 18.5	Underweight	< 18.5	Moderate
18.5 – 24.9	Normal Weight	18.5 – 22.9	Low
25.0 – 29.9	Overweight	23.0 – 27.4	Moderate
≥ 30.0	Obese	≥ 27.5	High

📊 Calculation Example

📋 Example Calculation

Person: Weight = 70 kg, Height = 175 cm (1.75 m)

Step 1: Height squared = 1.75 × 1.75 = 3.0625 m²

Step 2: BMI = 70 ÷ 3.0625 = 22.86

Result: BMI = 22.86 — Normal Weight ✅

📋 Example in Feet

Person: Weight = 65 kg, Height = 5 feet 6 inches

Convert: 5'6" = (5×30.48) + (6×2.54) = 152.4 + 15.24 = 167.64 cm = 1.6764 m

BMI: 65 ÷ (1.6764)² = 65 ÷ 2.810 = BMI = 23.13 — Slightly Overweight

❓ Frequently Asked Questions

What is a healthy BMI range?+

For standard WHO guidelines, a healthy BMI is between 18.5 and 24.9. However, for South Asians and Pakistanis, health experts recommend a healthy range of 18.5 to 22.9, as South Asians are at higher health risk at lower BMI values.

Is BMI the same for men and women?+

The BMI formula is the same for both men and women. However, women naturally have higher body fat percentage than men at the same BMI. Athletes may also have high BMI due to muscle mass, not fat.

How to calculate BMI in feet and inches?+

First convert height to meters. For example, 5 feet 8 inches = (5 × 30.48) + (8 × 2.54) = 172.72 cm = 1.7272 m. Then use the formula: BMI = Weight ÷ (1.7272)². Our calculator handles this conversion automatically.

Can BMI be wrong?+

BMI is a screening tool, not a definitive health measure. It does not account for muscle mass, bone density, age, or fat distribution. A very muscular person may have high BMI but be perfectly healthy. Always consult a doctor for medical advice.

What BMI is considered obese?+

By WHO standards, a BMI of 30 or above is classified as obese. For Pakistanis and South Asians, the threshold is lower at 27.5 or above. Obesity significantly increases risk of diabetes, heart disease and hypertension.

BMI Calculator — Calculate Body Mass Index Instantly

📐 BMI Calculator Formula

📋 How to Calculate BMI Calculator Manually

📊 Calculation Example

❓ Frequently Asked Questions

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