How to Use This Calculator
- Enter your height above sea level in meters. This can be your actual height if you're standing, or the height of a viewpoint like a hill, building, or vessel.
- Click the "Calculate" button to compute the distance to the horizon.
- The result will be displayed in both kilometers and miles.
Understanding the Formula
The calculator uses the following formula to calculate the distance to the horizon:
d = √(2Rh + h²)
Where:
- d is the distance to the horizon
- R is the Earth's radius (approximately 6371 kilometers)
- h is the observer's height above sea level
Practical Applications
This calculator is useful for:
- Navigation - determining how far you can see from a vessel or hill
- Observation - planning for astronomical viewing or wildlife spotting
- Understanding atmospheric and geographical concepts
Note: This calculation assumes a flat Earth surface. Actual visibility may be affected by atmospheric conditions, terrain features, and obstructions.