Midpoint Between Coordinates Calculator
Finds the point halfway along the shortest route between two coordinates.
Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
The formula
Bx = cos φ₂ × cos Δλ, By = cos φ₂ × sin Δλ φm = atan2(sin φ₁ + sin φ₂, √((cos φ₁ + Bx)² + By²)) λm = λ₁ + atan2(By, cos φ₁ + Bx)
The Earth is treated as a sphere. Longitude is wrapped back to the range ±180°.
What to watch out for
For points close together the plain average of the coordinates is near enough. For long routes, or those close to a pole or the 180° meridian, the average can be far off.
Frequently Asked Questions
Where is the midpoint between London and New York?
About 52.4° N, 41.3° W, in the North Atlantic. Averaging the coordinates would give 46.1° N, 37.1° W, a different spot.
What about a route that crosses the 180° meridian?
It is handled. Halfway between 170° E and 170° W on the equator comes out at 180°, not at 0°.