You can convert by using this app...

(LENGTH)
inch
foot(feet)
centimeter
meter
kilometer
mile
yard

(WEIGHT)
ounce
pound
gram
kilogram
stone
short ton
long ton
metric ton

(TEMPERATURE)
Celsius
Fahrenheit

(FLUID)
fl oz(US)
fl oz(UK)
gallon(US)
gallon(UK)
milliliter
liter

(HOW TO USE)
Enter the number in upper box by using software keyboard and choose your seeking unit, then push CHANGE button. That's all.
You can also change the setting by touching 3-points icon at upper right. You can change text sizes, background color (white or black) , and the number of decimal places 1 by 4.