Geo Distance

Enter A and B, choose the coordinate system, model and distance unit, then Calculate. Decimal degrees use latitude then longitude, for example 40.7128, -74.0060. Use a decimal point, not a decimal comma. Degrees/minutes/seconds use symbols, for example 40°42′46″N 74°00′22″W; colon notation is also accepted. Hemisphere notation requires one N/S and one E/W coordinate, and can reverse their order. Minutes and seconds must be below 60, and signs must agree with hemispheres. Latitude is −90…90°, longitude −180…180°. UTM accepts zone/hemisphere/easting/northing; MGRS accepts a grid reference. Changing systems inserts the New York–London example. Input edits clear old output; drafts remain saved locally.

WGS-84 computes the shortest ellipsoidal surface geodesic with the bundled GeographicLib. Sphere uses a great circle with mean radius 6,371.0088 km; it is an approximation. Earth chord is a straight line through the Earth between ECEF points on WGS-84 at zero ellipsoidal height, not a road, flight route or underground travel plan. The unit selection changes only distance. No elevation, terrain, traffic or routing service is included.

Azimuths are degrees clockwise from true north. Final azimuth is the forward direction on arrival, not the return bearing. Coincident points have no bearing; spherical antipodes have no unique bearing. For ellipsoidal antipodes GeographicLib returns one valid solution; other equally short geodesics may exist. Polar bearings depend on the longitude convention. Technical coordinates show converted latitude/longitude and ECEF x/y/z plus geocentric cylindrical ρ/φ; the origin is Earth’s center. MGRS uses the southwest corner of the indicated grid cell, not its center, so low precision denotes an area. No map or altitude input.