Category Archives: Medical

How to calculate BMI – BMI Formula and Online BMI Calculator

Despite it’s name – Body Mass Index, BMI does not measure body fat directly. However, research has shown that BMI is moderately correlated with direct measures of body fat, and more importantly BMI appears to be as strongly correlated with various metabolic and disease outcome as the direct measures of body fat.
If you are looking for direct measurements you might be interested in the instruments below, otherwise continue reading.



How is BMI calculated?

Step 1 – height

Multiply your height by itself.

Step 2 – weight

Divide your weight in kilograms by the value calculated in step 1. For US unit multiply your height by 703 and then divide by the value calculated in step 1.

BMI formula - BMI Metric formula | BMI US formula


BMI calculator

  • Units

  • Gender

  • Age

  • Height


  • Weight


  • Height

    ft. in.

  • Weight




  • Underweight

    < 0

  • Healthy weight

    0 - 0

  • Overweight

    0 - 0

  • Obese

    0 - 0

  • Morbidly obese

    > 0

  • Ideal weight

    0 - 0


If your BMI is above or below healthy weight, please refer to the BMR Calculator to find out how many calories you should be taking in daily.


If you would like to calculate how many of your calories come from fat, protein, and carbohydrates, please refer to the Online Grams to Calories Converter.


How to Perform an Emergency Tracheotomy

1. Find the indentation between the Adam’s apple and the Cricoid cartilage.

How to Perform an Emergency Tracheotomy on Darth Vader -  Adams apple and Cricoid cartilage
Find the Adam’s apple, then slide your finger down the neck about one inch until you feel another bulge. This is the cricoid cartilage. The indentation between the two is the Cricothyroid membrane, where the incision should be made.


2. Make a half-inch horizontal incision about one half inch deep.

How to Perform an Emergency Tracheotomy on Darth Vader -  horizontal incision
Take the razor blade or knife (or a tiny surgical lightsaber) and make a half-inch horizontal incision. The cut should be about an inch deep – there shouldn’t be too much blood.


3. Pinch the incision and insert a tube

How to Perform an Emergency Tracheotomy on Darth Vader - insert a tube
Pinch the incision open or place your finger inside the slit to open it.
Insert a tube into the incision, roughly an inch deep.
Breathe into the tube with two quick breaths. Pause five seconds, then give one breath every five seconds.