Air Distance Calculator
Enter two latitude-longitude pairs to calculate their great-circle separation in kilometres, statute miles, and nautical miles.
Written and checked by TheToolNet Editorial Team · Last reviewed: September 20, 2026 · Editorial method
Calculate straight-line air distance
What great-circle distance means
The shortest surface path on a spherical Earth lies along a great circle. This calculator uses the haversine formula and the IUGG mean Earth radius of 6,371.0088 km, so it is useful for broad comparisons rather than surveying.
Not the same as a flight route
An airline route may be longer because of airways, winds, restricted airspace, weather, and departure or arrival procedures. A road or Google Maps distance follows a network and answers a different question. NOAA also provides an official latitude-longitude distance calculator.