Horizon & Distance Calculators

Horizon line-of-sight and distance converters

Line-of-sight to horizon

Observer height (ft)

Enter height above surface in feet.

Target height (ft)

Enter distant object's height in feet.

Results — Imperial (ft / mi)

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Results — Metric (m / km)

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Imperial → Metric distance

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All calculations assume a spherical Earth (R = 6,371 km). Distances are geometric approximations.