Calculate Distance Between Two Coordinates
Enter latitude and longitude for two points on Earth to compute great-circle distance using the haversine formula.
What Is the Haversine Formula?
The haversine formula is a standard method for calculating the shortest distance between two points on a sphere using their latitude and longitude. On Earth, that shortest route is called a great-circle distance. This is especially useful for aviation, navigation, GIS mapping, logistics, and travel planning.
Unlike simple flat-map distance estimates, haversine accounts for the Earth’s curvature. That makes it much more accurate when coordinates are far apart, such as across countries or continents.
How This Haversine Calculator Works
Inputs
- Latitude values must be between -90 and 90 degrees.
- Longitude values must be between -180 and 180 degrees.
- You can use decimal degrees from GPS devices, mapping software, or APIs.
Outputs
Once you click Calculate Distance, the tool returns:
- Distance in your selected unit (kilometers, miles, or nautical miles)
- All three unit conversions for quick comparison
- Initial bearing from Point A to Point B
Why Great-Circle Distance Matters
Many real-world systems need geospatial precision. A few examples:
- Fleet management: estimate route baselines and dispatch zones.
- Delivery apps: measure straight-line distance before routing engines run.
- Drone and aviation tools: compute headings and waypoint gaps.
- Travel and education: compare city-to-city distances globally.
Accuracy Notes and Practical Limitations
The haversine approach assumes Earth is a perfect sphere with radius ~6,371 km. In reality, Earth is slightly oblate, so there can be small deviations compared with advanced ellipsoidal models such as Vincenty or geodesic libraries.
For most consumer apps and general analytics, haversine is accurate enough and computationally lightweight. If you need centimeter-level geodesy, use a high-precision geospatial library and a formal Earth datum (such as WGS84).
Quick Example
Try the sample button to load New York City and London coordinates:
- New York: 40.7128, -74.0060
- London: 51.5074, -0.1278
The result will show a great-circle distance of roughly 5,570 km (about 3,460 miles), plus the initial bearing from NYC toward London.
Final Thoughts
A good haversine distance calculator is simple, fast, and reliable for most coordinate-based workflows. Whether you are building mapping software, planning travel, or just exploring geography, this method gives a strong balance between ease and accuracy.