| 1840 | Sir Charles Napier arrives in Karachi and lays the foundations for the social, economic and cultural development of the city. |
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| 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. |