Earth Curvature Calculator Calculator
Calculate curvature drop, horizon distance, hidden height and additional spherical geometry values for a given distance.
Info
The Earth curvature calculator is used to estimate the geometric effect of Earth’s spherical shape over a given distance. It computes values such as curvature drop, horizon distance, hidden height, central angle, chord length and arc length, making it useful for both education and technical pre-analysis. This calculator is especially useful for: - horizon and line-of-sight analysis - long-distance observation and optical estimation - marine and coastal visibility studies - geography and physics education - basic geometry exercises related to Earth curvature - preliminary analysis for radar, cameras, towers and observation points The tool models Earth as an approximate sphere using a standard Earth radius. This allows it to estimate: - how far the surface “drops” over a given distance - how far an observer can see to the horizon from a given height - how much of an object beyond the horizon may be hidden - the central angle and spherical arc relationship for the entered distance Important note: In the real world, atmospheric refraction, temperature layering, pressure gradients, terrain elevation, sea conditions and observation setup may significantly affect actual visibility. This calculator therefore provides a theoretical approximation.
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