Great Circle Distance Calculator

Calculate the shortest distance between two points on Earth using the Haversine formula. Includes initial course, final bearing, and midpoint.

Departure Latitude

Departure Longitude

Destination Latitude

Destination Longitude

Tab to move between fields

Distance

747.8 NM

Initial True Course

246°

Distance860.5 SM

Distance1,384.8 km

Final Bearing238°

Est. Time at 120 kt374 min

Est. Time at 450 kt100 min

How to Use This Calculator

How the result changes with Destination Longitude

Departure Latitude: Latitude in decimal degrees. North is positive, South is negative. Example: Denver = 39.8561
Departure Longitude: Longitude in decimal degrees. East is positive, West is negative. Example: Denver = −104.6737
Destination Latitude: Destination latitude in decimal degrees. Example: LAX = 33.9425
Destination Longitude: Destination longitude in decimal degrees. Example: LAX = −118.4081

Great Circle Distance
Haversine: d = R × 2 × atan2(√a, √(1−a))
From 39.8561°N, 104.6737°W to 33.9425°N, 118.4081°W = 747.8 NM
Initial True Course
θ = atan2(sin(Δlon)·cos(lat₂), cos(lat₁)·sin(lat₂) − sin(lat₁)·cos(lat₂)·cos(Δlon))
From departure coordinates = 246°
Midpoint
Calculated from spherical geometry
Halfway along the great circle = 37.0973°N, 111.8085°W