Great Circle Distance Calculator

How to use this calculator

What to enter

Enter or select the following as requested: Latitude 1; Longitude 1; Latitude 2; Longitude 2. Follow the units, valid ranges, examples, and options displayed beside each field.

What the result means

The surveying or mapping result is derived from the coordinates, bearings, distances, elevations, or scale entered. Check the coordinate reference system, units, datum, bearing convention, and whether the calculation assumes a flat plane or the Earth’s curvature.

When to use it

Use this for educational or preliminary mapping and survey calculations. Confirm the datum and field measurements, and use qualified survey data for legal boundaries, construction set-out, or other precision work.