A high-precision great-circle distance calculator. Select a preset below or input custom global coordinates to instantly map the physical distance across the Earth's surface.
A flat map distorts reality. If you draw a straight line between two cities on a standard 2D map, it won't give you the actual distance. The Haversine formula determines the great-circle distance between two points on a sphere given their longitudes and latitudes.
d = 2r · arcsin( √[ sin²(Δφ/2) + cos(φ₁)cos(φ₂) · sin²(Δλ/2) ] )
Notice a slight discrepancy compared to GPS data? The Haversine algorithm assumes the Earth is a perfect sphere (radius 6,371 km). Because the Earth actually bulges at the equator, this mathematical model carries a known error margin of ~0.3% to 0.5% compared to complex ellipsoidal calculations like WGS-84.