Tools🇰🇷 KO

Shadow Length Calculator

Shadow length from sun altitude, or noon shadow from latitude and date

Shadow Length (enter sun altitude)
Shadow length
0 m
Noon shadow — from latitude & date
⚠️ This calculator is a simple reference tool based on standard engineering formulas. Actual required values may differ due to site conditions, materials, construction tolerances, specifications and changes in applicable regulations. calcstool.com assumes no legal liability for any decisions or damages arising from use of these results.
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FAQ
How is shadow length calculated?
Shadow length = object height ÷ tan(sun altitude). The lower the sun, the longer the shadow; the shadow is shortest at solar noon when the sun is highest.
How is noon shadow found?
From latitude and date we compute the noon sun altitude (= 90 − latitude + solar declination), then the shadow length at that altitude. Useful for solar access and building setbacks.
Can I use it for solar access?
Yes. The winter solstice (around Dec 22) noon shadow is the longest and is the worst-case for solar access analysis. Set the date to the solstice to check it.
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Shadow Length

Shadow length depends on object height and the sun's altitude angle. The lower the sun sits, the longer the shadow. This is used for solar-access and setback checks, photography, and solar-panel spacing.

Formula

Shadow = height ÷ tan(sun altitude). If you don't know the sun altitude, enter latitude and date and the noon altitude (= 90 − latitude + solar declination) is computed for you.

Uses

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