Free tool
Shadow length calculator
Enter the height of the building, pick the place, date and time, and see how long its shadow is and which way it falls.
Try it here, free
No account. Nothing to install.
Shadow length
66.9 m
Falls towards
north
Sun altitude
15.1°
Sun azimuth
180° from north
The formula
Shadow length is the height divided by the tangent of the sun’s altitude. At 45° the shadow equals the height; on a winter noon in London (about 15°) it is nearly four times the height.
On a real site
Neighbouring buildings, slopes and the scheme’s own shape change what is in shade. A sun and shadow study runs it on the real context in 3D.
Questions
Which way does the shadow fall?
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Opposite the sun: with the sun in the south, the shadow points north.
Related
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Start with any site on Earth
Search an address for a free preview: buildings, climate and sun angles, no account.