Tag Archives: Tool

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.


JSON validator


How to Calculate Average (Arithmetic Mean)

How to Calculate Average (Arithmetic Mean) - Average formula - Mean formula

To calculate the average of a group of numbers, all one must do is add all the numbers up and then divide by the total amount of numbers.

Let’s take the following numbers for example:

6, 5, 4, 3

The sigma of 1 through n – or the sum of all the numbers is 18.

6 + 5 + 4 + 3 = 18

The n – or the total count of numbers is 4.
18 divided by 4 is 4.5.

18 / 4 = 4.5

It’s easy. Here, you can try it yourself.

Enter your comma separated numbers here:

Enter your calculation result for the average here:


Image to ASCII Art Converter

This is a client-side image to ASCII converter. It identifies each pixel’s RBG and translates it to 1 of 14 shades. Each shade is represented by a character – the lighter the shade the smaller in surface area should the character be.

Usage instructions:
Change the image url to point to your image and press ENTER.
You may also change the ascii values that correspond with the shades or use the defaults.


Turn colors on/off

View code on github

How to Turn Your Phone’s Flash into a Black Light / How to Detect Semen on the Go

A black light works by producing UVA light, or ultraviolet light.

Ultraviolet light by itself is above the spectrum of visible light, and cannot be seen. However substances that are emitting light in response to radiation (phosphors) glow in the dark in the presents of a black light.

The glow is created by the special way phosphors use the energy from UV light. When a photon from a UV light hits the phosphorous material, it causes the electrons to get excited and stray farther from the nucleus than they normally would. When the electron falls back to its normal state, some of the energy is lost in the form of heat. When the UV light wave is reflected back to the human eye, it now has less energy, therefore a shorter wavelength. This wavelength is in the range that we can see. The end result being, you cannot see the majority of the light coming from the source, but you can see its reflection off of objects containing phosphors.

Black lights are used in crime scene investigators to identify body fluids – including semen, sweat, saliva and urine. Semen happens to glow the brightest.
Turn your phone to a body fluid tracking tool, and detect semen on the go.

How to Turn Your Phone Camera Flash into a Black Light


How to Turn Your Phone Camera Flash into a Black Light


1. Apply a small piece of tape over the phone’s flash.

How to Turn Your Phone Camera Flash into a Black Light - Apply a small piece of tape over the flash


2. Color the piece of tape with the blue Sharpie.

How to Turn Your Phone Camera Flash into a Black Light - Color the piece of tape with the blue Sharpie.


3. Apply another small piece of tape on top of the blue tape, and color it with the purple Sharpie.

How to Turn Your Phone Camera Flash into a Black Light - Color the piece of tape with the purple Sharpie.


Now turn your flashlight app on in a dark motel room and be a appalled.
Enjoy : )