Free tool
Coordinate inverse calculator
Enter two points on a grid. Get the distance, the bearing and the height difference.
Method and limits
- The points are treated as being on one flat grid, in metres. The distance is a grid distance: no scale factor, elevation or curvature correction is applied. To get a ground distance, apply your project's combined scale factor.
- Bearing is a grid bearing, measured clockwise from grid north, 0 to 360 degrees. It is the angle of the line from point 1 to point 2, from the arctangent of delta easting over delta northing.
- Height difference is point 2 minus point 1. Slope distance is the straight-line distance in 3D. Grade is rise over horizontal run. The tool does not assume any coordinate system or height datum: use consistent values.
- Results are shown to the decimals you pick; the calculation itself uses full precision. Checked against 300 random cases at high precision.
- This tool is a convenience, not a survey deliverable. Check results against your own work, and use certified methods for anything you sign off. Provided as is, in line with the terms. Nothing you enter is sent anywhere.