Navigation tools
Distance Calculator
Enter two GPS coordinates to calculate the great-circle distance between them. Results are shown in nautical miles, statute miles, kilometres, metres, and feet.
Point A
Tip: paste a full pair here — e.g. 51.5074, -0.1278 or 51° 30′ N, 0° 07′ W
Point B
Tip: paste a full pair here — e.g. 51.5074, -0.1278 or 51° 30′ N, 0° 07′ W
How it works
The calculator uses the haversine formula to compute the shortest path between two points on the Earth’s surface — the great-circle distance. This is the standard method used by GPS devices and electronic chart systems. The Earth radius used is the WGS84 mean radius of 6,371.0088 km.
Note that this is the great-circle (as-the-crow-flies) distance, not a rhumb-line or coastal route distance.
Units
- Nautical miles (nm) — the standard unit for marine and aviation navigation. 1 nm = 1.852 km exactly.
- Statute miles (mi) — commonly used for reference in US and UK contexts.
- Kilometres (km) — the SI unit; used on most modern charts and GPS devices.
Input tips
- Accepts decimal degrees (
51.5074) or DMS (51° 30' 26" N). - Both points can use different input formats.
- Negative latitude = South; negative longitude = West.