Unit Conversion :

   
Want to know how many miles  are in a "2.18 kilometers"  or what is the hexadecimal ,binary ,octal and roman equivalent  of the decimal number "2315"?
Want to know what is the "miles/gallon" equivalent to  the engine consumption of  "100 kilometer/liter" ? 
Want to know the Fahrenheit equivalent to :   "33 Celsius" ?
Want to Calculate the value of sine(13) , secant(15) ,tanh(20) or arctan(1) ?