|1840||Sir Charles Napier arrives in Karachi and lays the foundations for the social, economic and cultural development of the city.|
|1847||Rev. H. Brereton, the first Chaplain of Karachi, starts a class from which KGS grows.|
|1854||The School is formally constituted by Sir Henry Bartle Frere and reopens as the Karachi European and Indo-European School.|
|1871||The earliest recorded reference to the School's motto, Indocti Discant:
'Let the unlearned learn' (a quotation from Horace).
|1875||The School moves into purpose-built premises, (the present Saddar building) largely due to the efforts of Rev. G.B. Streeton.|
|1879||The name is changed to Karachi Grammar School.|
|1893||The first Old Grammarian (as far as we know) to gain a Masters degree at university: Matilda Hunt, MA (Bombay).|
|1912||The first student (Bernard Tobin) takes the Senior Cambridge School Certificate Examination.
"The Shed" is built as a temporary place for large gatherings behind the main School building.
|1916||The top floor is added to the School building.|
|1925||Electricity is installed in the School.|
|1927||The First Athletic Sports is held.|
|1929||The House system is introduced: originally named A, B and C and changed the following year to Napier, Frere and Streeton. (Streeton was the first Cock House).|
|1936||The first issue of The Grammarian is published.|
|1942||The First Art Exhibition is held.|
|1947||INDEPENDENCE OF PAKISTAN.
The Centenary of Karachi Grammar School.
|1949||The War Memorial Block is opened at the rear of the School courtyard.|
|1956||The School crest is changed to its present form.|
|1962||A new purpose-built Kindergarten is opened on the Holy Trinity Cathedral Compound.|
|1963||New Science laboratories are completed.|
|1983||The first computer arrives at School.|
|1987||Cambridge examinations are brought forward to June.|
|1991||The Kindergarten Section moves from the Cathedral compound and the Junior Section from Saddar to combine in purpose-built premises at Clifton.|
|1999||A new College Section is created for O-/A-level students in purpose-built premises at Clifton; the Middle Section (Classes VII-IX) remains in Saddar.
A new House is created in memory of Mr J L Papworth, OBE, Music Teacher, Vice-Principal, Bursar and Principal.
|2000||The first students gain ‘Top of the World’ Awards from Cambridge International Examinations.|
|2005||A major programme of modernisation at the Middle Section begins.|
|2008||Additional AV-Rooms opened in the Kindergarten and Middle Sections and a Lecture Hall in the College Section.|
|2009||Three sports courts are added at the Middle Section|
|2010||ICT facilities are upgraded in the Kindergarten and Junior Sections.|