Calculate great-circle distance between two coordinates using Haversine and Vincenty formulas.
Enter two latitude-longitude pairs to compare a spherical Haversine distance with an ellipsoidal Vincenty distance. Both describe the shortest surface separation between the coordinates, so the results may differ slightly because they use different Earth models. The common mistake is to read either value as a road, walking, or terrain distance; neither follows a route or includes elevation. Latitude and longitude can also be accidentally reversed. Because coordinates may reveal sensitive locations, the calculation stays in the browser and does not upload them.
The Haversine calculation turns the latitude and longitude differences into a central angle between the two points, then converts that angle to distance with a spherical Earth radius. It returns a great-circle estimate that is symmetric when the endpoints are exchanged. The spherical model ignores flattening, terrain, altitude, road geometry, and barriers.
The Vincenty inverse calculation treats latitude and longitude as positions on a reference ellipsoid and solves for the geodesic between them. Flattening is included, so this result usually differs slightly from the Haversine value. Comparing the two values shows the effect of the Earth model for the selected coordinate pair, not measurement uncertainty at either endpoint.
Haversine assumes a sphere, while Vincenty accounts for flattening through an ellipsoid. The difference depends on the endpoints and path orientation, so there is no single correction factor. For ordinary coordinate pairs, a small disagreement is expected. It does not mean the tool has found two different routes.
No. These are geodesic surface distances derived only from latitude and longitude. They do not include road networks, legal access, turns, grades, terrain, or the altitude of either point. Use a routing service for travel distance. For true three-dimensional separation, you also need compatible elevations and a defined coordinate model.
The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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