How to use this tool
Check the units, enter your values, and run the tool. Results follow the assumptions and method below.
Calculation method
Surface drop below tangent
radius-sqrt(radius^2-distance^2)Earth Curvature Calculator
Spherical Earth in tangent coordinates; distance must be less than radius. Refraction excluded.
Spherical Earth in tangent coordinates; distance must be less than radius. Refraction excluded.
Result
Enter your values and run the tool to see your result.