BMI Calculator (kg, lbs) + BMI Chart Explained

 Body Mass Index (BMI) is a simple way to check whether your weight is healthy for your height. It is commonly used by doctors, fitness professionals, and individuals to get a quick overview of body weight status.

BMI Calculator

Choose Unit:
kg & cm lbs & inches

Weight:


Height:

BMI Range	Weight Category
Below 18.5	Underweight
18.5 – 24.9	Normal weight
25.0 – 29.9	Overweight
30.0 and above	Obese

BMI or Body Mass Index is a simple number that shows whether your weight is in a healthy range for your height. It’s one of the easiest ways to check if you're underweight, normal weight, overweight, or obese.

Doctors and fitness apps use BMI as a quick screening tool. It’s not perfect, but it gives you a useful starting point to understand your body weight.

 

BMI Formula (kg and lbs)

There are two versions of the formula depending on which units you use.

1. Metric Formula (kg and cm)

If your height is in meters:

BMI = Weight (kg) ÷ Height² (m²)

If your height is in centimeters:

BMI = Weight (kg) ÷ (Height (cm) ÷ 100)²

Example (Metric)

Weight = 60 kg
Height = 160 cm (1.60 m)

BMI = 60 ÷ (1.60 × 1.60)
BMI = 60 ÷ 2.56
BMI = 23.44

This is considered normal weight.

2. Imperial Formula (lbs and inches)

If you use pounds and inches:

BMI = (Weight (lbs) ÷ Height² (inches²)) × 703

Example (Imperial)

Weight = 132 lbs
Height = 63 inches

BMI = (132 ÷ 3969) × 703
BMI = 0.0333 × 703
BMI = 23.41

 

BMI Chart Explained

Once you get your BMI number, you can compare it with the chart below:

BMI	Category
Below 18.5	Underweight
18.5 – 24.9	Normal weight
25.0 – 29.9	Overweight
30.0 – 34.9	Obese (Class I)
35.0 – 39.9	Obese (Class II)
40.0+	Obese (Class III)

In simple terms:

• Under 18.5 → You may need to gain weight
• 18.5–24.9 → Healthy range
• 25–29.9 → Slightly above healthy range
• 30+ → Higher health risk

 

How to Calculate BMI (Step‑by‑Step)

Metric

1. Measure your weight in kilograms
2. Measure your height in centimeters
3. Convert height to meters (divide by 100)
4. Multiply height by itself
5. Divide weight by that number

Imperial

1. Measure your weight in pounds
2. Measure your height in inches
3. Multiply height by itself
4. Divide weight by that number
5. Multiply the result by 703

 

Example BMI Calculations

Example 1

Height: 153 cm
Weight: 60 kg

BMI = 60 ÷ (1.53 × 1.53)
BMI = 25.63

Category: Overweight

 

Example 2

Height: 170 cm
Weight: 65 kg

BMI = 65 ÷ (1.70 × 1.70)
BMI = 22.49

Category: Normal weight

 

Why BMI is Useful

BMI helps you quickly understand if your weight might increase your risk for health problems such as heart disease, diabetes, high blood pressure, joint stress and many more. It also commonly used in health apps, clinics, and fitness programs.

 

But it is important to remember that, BMI is helpful, but it doesn’t tell the full story. It won’t know how much is your weight muscle, fat or even body shape. Therefore, Just remember — BMI is only a general guide. Your overall health depends on many things, including body fat, lifestyle, and medical factors.

Calculate Number of Days Between Two Dates

Calculate how many days between two dates. Just enter Start Date and End Date.

Simple basic calculate to calculate how many days.

Date Difference Calculator

Start Date:


End Date:

Why is this calculator significant, then?

It is a typical task in daily life, education, employment, business, and programming of figuring out how many days separate two dates. Knowing how to precisely calculate the difference between two dates is vital if you're managing deadlines for projects, calculating age, reviewing membership periods, or analyzing data.

A Simple Approach to Concept Understanding

On a timeline, every occasion can be represented as a point. The travel distance between both of these locations is the amount of days that separate two dates.

For example:

• Start date: 1 January 2026

• End date: 10 January 2026

• Difference: 9 days

Important note to remember, the result usually does not include the start date, but includes the days after it. However, this depends on the specific requirement.

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Method 1: Manual Calculation

To calculate manually:

1. Count the remaining days in the start month.

2. Add the days in the months between.

3. Add the days in the final month.

Example

Start date: 28 February 2026
End date: 5 March 2026

Calculation:

• Remaining days in February: 0 (since February 28 to March starts next day)

• Days in March: 5

Total difference: 5 days

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Method 2: Using a Formula (General Approach)

The general formula is:

Days Difference = End Date − Start Date

In computing systems, dates are converted into serial numbers (total days since a reference date), then subtracted.

Example:

End Date serial number: 45010
Start Date serial number: 45001

Difference = 45010 − 45001 = 9 days

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Method 3: Using Software like Microsoft Excel or Google Sheets

Excel and Google Sheets make this very easy.

Formula:

=EndDate - StartDate

Example:

If:

• Cell A1 = 01/01/2026

• Cell B1 = 10/01/2026

Formula:

=B1 - A1

Result:

9

Alternative using DATEDIF function:

=DATEDIF(A1, B1, "D")

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Method 4: Using Programming Languages

Example (Language used: Python)

from datetime import date

start = date(2026, 1, 1)
end = date(2026, 1, 10)

difference = end - start
print(difference.days)

Output:

9

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Please remember

1. Additional Day in Leap Years

Leap years contain 366 days instead of 365. February has 29 days. Example of a leap year is 2024.

2. Including or Excluding Start Date

Two possible interpretations:

• Excluding start date: Jan 1 to Jan 2 = 1 day

• Including start date: Jan 1 to Jan 2 = 2 days

Always define which method you need.

3. Time Zones

If time is included, time zone differences may affect the result. 

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Example of usage

Calculating date differences is useful in:

• Project management

• Age calculation

• Subscription billing

• Employee attendance tracking

• Delivery estimation

• Event planning

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Example Scenarios To Calculate Days Between Two Dates

Example 1: Age in Days

Date of birth: 1 January 2000
Current date: 1 January 2026

Difference: 9,497 days

Example 2: Project Duration

Start: 1 March 2026
End: 15 April 2026

Difference: 45 days

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Calculating the number of days between two dates is a simple but important knowledge. By understanding this concept, it will help to improve accuracy in planning, analysis, and time management which is beneficial for your daily life.

Therefore, by using the methods described in this article, you can quickly and accurately determine the number of days between any two dates.