Straight-line (great-circle / Haversine) distance between two cities. Useful for flight planning estimates and rough travel time comparisons.
The straight-line (aerial or great-circle) distance between two cities is calculated using the Haversine formula, which accounts for the curvature of the Earth to compute the shortest path along the surface of a sphere. Named after the haversine trigonometric function and first published in a navigational context by James Andrew in 1805, the formula is accurate to within 0.3% for most terrestrial distances. Actual road distances are always longer than aerial distances due to terrain, road alignments, and detours - typically 20-40% longer for Indian cities.
India stretches approximately 3,214 km from north to south (Kashmir to Kanyakumari) and 2,933 km from east to west (Arunachal Pradesh to Kutch, Gujarat), covering an area of 3.28 million square kilometres. The aerial distance from Delhi to Chennai is approximately 1,754 km, while Mumbai to Kolkata spans about 1,650 km. These distances matter for freight logistics planning - India's logistics sector, valued at USD 250 billion and employing over 22 million people, uses distance calculations for route optimisation, toll cost estimates, and delivery time projections. Aviation, railways, and road transport all use aerial distance as a planning baseline.
Select or type two cities from the database of 200+ Indian and international cities. The tool retrieves stored latitude/longitude coordinates for each city and applies the Haversine formula to compute the great-circle distance. Results are displayed in kilometres, miles, and nautical miles simultaneously. The Earth's mean radius used is 6,371 km (WGS-84 standard). Use this for travel planning, shipping estimates, or academic geography problems for CBSE and UPSC syllabi.