Great Circle Distance Calculator
Calculate shortest distance between two points on Earth's surface
About this calculator
The Great Circle Distance Calculator determines the shortest distance between two points on Earth's surface by calculating the great circle path. This spherical geometry method accounts for Earth's curvature, providing more accurate measurements than straight-line distances on flat maps. It's essential for aviation route planning, maritime navigation, GPS applications, and geographic analysis where precise distance calculations are critical for fuel efficiency, travel time estimation, and logistics optimization.
How to use
Enter the latitude and longitude coordinates for your starting point and destination in decimal degrees format. The calculator will automatically compute the great circle distance using the haversine formula. Results are typically displayed in both kilometers and miles for convenience.
Frequently asked questions
What is a great circle distance?
The shortest distance between two points on a sphere's surface, following the curvature of Earth rather than a straight line on a flat map.
How accurate is this calculator?
Very accurate for most purposes, using the haversine formula with Earth's mean radius. Precision depends on coordinate accuracy and Earth's slight oblate shape.
Why not use straight-line distance?
Straight-line distances ignore Earth's curvature, becoming increasingly inaccurate over longer distances. Great circle distances reflect actual travel paths on Earth's surface.