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Calculators: Angular Diameter | Distance | Distance to the Horizon | Thumb Method | Speed | Apparent Length | Height Estimation | Shadow Casting | Shadow Length

Estimate Apparent and Real Length of Inclined Objects

Estimate Apparent and Real Length of Inclined Objects

Calculator for the real and the visible length of straight objects, that are viewed from an angle. The angle of inclination is in degrees, real and apparent length have the same unit, e.g. meters or feet. An example: when looking at a house wall with a width of 8 meters in an angle of 30°, it seems as wide as a wall with a width of 6.9 meters, that is watched vertically. If you know the distance, you can calculate the angular diameter.


Angle of inclination α: °
Real length l: ft, m, ...
Apparent length a: ft, m, ...



Please enter two values, the third will be calculated.

Formula: a = l * |cos(α)|


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