https://c.mi.com/thread-1781090-1-0.html
playstore Best calculator in Google Play must watch the video ..

1) weight and Height =Kilograms to centimeters
2) Age
3) Discount%(off)
4) Percentage (%)
5) Date
6) Length Converter =Meter to kilometer
7) Area Convertert=Are to Square to kilometer
8) Volume Converter =liter to centilliter
9) Temperature Converter. To Clecius to Fahrenheit
10) Speed =kilometer par hours to kilometer par seconds
11)Time =minute to second
12)Mass =kilograms to milligram

13) Numeral = Binary to octal