Latitude/Longitude Distance Tool
Enter two coordinate points in decimal degrees to calculate the straight-line (great-circle) distance across Earth.
Point A
Point B
A lat long distance calculator gives you the shortest path between two points on Earth using their geographic coordinates. Instead of road miles, this is “as the crow flies” distance over the Earth’s curved surface. It is useful for logistics planning, travel research, aviation, mapping projects, and geospatial analysis.
What this calculator measures
This tool calculates great-circle distance using the Haversine formula. That means it treats Earth as a sphere and computes the shortest surface path between Point A and Point B.
- Input: latitude and longitude in decimal degrees
- Output: distance in kilometers, miles, and nautical miles
- Bonus: initial bearing and midpoint coordinate
For many practical tasks, Haversine is accurate enough. If you need survey-grade precision over long baselines, you would use more advanced ellipsoidal models.
How to use the lat long distance calculator
1) Enter coordinates for Point A and Point B
Latitude must be between -90 and 90. Longitude must be between -180 and 180. North and East are positive values; South and West are negative.
2) Choose your preferred output unit
You can choose kilometers, miles, or nautical miles. The result panel still shows all three so you can compare quickly.
3) Click Calculate Distance
The tool validates your inputs and displays:
- Primary distance in the selected unit
- Equivalent distance in the other common units
- Initial bearing from A to B
- Midpoint between both coordinates
Practical use cases
- Travel planning: compare direct flight distance between cities
- Fleet operations: estimate route baselines for dispatch strategy
- Marine and aviation: use nautical miles and headings
- GIS and data science: features for clustering, nearest-neighbor, and geofencing models
- Education: learn how coordinate geometry works on a sphere
Common mistakes to avoid
Latitude/longitude swapped
A frequent error is placing longitude where latitude should go. If your result seems way too large, double-check field order.
Using degrees-minutes-seconds without conversion
This tool expects decimal degrees. Convert formats like 40°42'46" N first (which becomes approximately 40.7128).
Expecting driving distance
Great-circle distance is not road distance. Roads, terrain, and traffic constraints usually make driving distances longer.
FAQ
Is this accurate for global distances?
Yes, for most applications. Haversine is widely used for geographic distance calculations and provides strong practical accuracy.
What is initial bearing?
Initial bearing (forward azimuth) is the compass direction you start with when traveling from Point A to Point B along a great-circle path.
Can I calculate distance between identical points?
Yes. The tool returns zero distance and marks the bearing as not applicable.
Bottom line
If you need a fast way to compute direct distance from one coordinate to another, this lat long distance calculator is a reliable option. Enter decimal coordinates, hit calculate, and get a clean result with useful navigation extras.