This app is using for converting amounts from Kilogram to Stone as well as converting amounts from Stone to Kilogram.

First of all, let us talk about Kilogram type and Stone type:


Kilogram (kg):

The SI unit of mass, equivalent to the international standard kept at Sèvres near Paris (approximately 2.205 lb).
The kilogram or kilogramme is the base unit of mass in the International System of Units. Until 20 May 2019, it remains defined by a platinum alloy cylinder, the International Prototype Kilogram, manufactured in 1889, and carefully stored in Saint-Cloud, a suburb of Paris.


Stone (st):

The stone is an English and imperial unit of mass now equal to 14 pounds (6.35029318 kg).
England and other Germanic-speaking countries of northern Europe formerly used various standardised "stones" for trade, with their values ranging from about 5 to 40 local pounds (roughly 3 to 15 kg) depending on the location and objects weighed.
The United Kingdom's imperial system adopted the wool stone of 14 pounds in 1835. With the advent of metrication, Europe's various "stones" were superseded by or adapted to the kilogram from the mid-19th century on.
The stone continues in customary use in Britain and Ireland used for measuring body weight, but was prohibited for commercial use in the UK by the Weights and Measures Act of 1985.


By the way, As far as I told, this app is useful for converting amounts from Kilogram to Stone and Converting data from Stone to Kilogram.
So let's start using it.