Height or Distance Calculation with a ruler (Biltmore stick)

Calculation of the height or distance of an object with the aid of a ruler. One value, distance or height, must be known or estimated. At length of the stretched arm from eyes to ruler, an average value (in cm) is set. For a better estimation, you should take your measure.
Biltmore stick: stretch one arm and hold up a ruler. On this, you can read the apparent height of the distant object.

Distance eyes-ruler a:		cm or in
Distance to the object b:		m or ft
Apparent height on the ruler c:		cm or in
Height of the object d:		m or ft

Please enter the apparent height and distance to the object or its height, the other value will be calculated.

Formula: d = b * c / a

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