Free · Estimate a straight shadow

Shadow Length Calculator

Use the sun angle and an object's height to estimate its level-ground shadow length.

SunCalc 2 astronomy
Private in your browser
JSON and CSV downloads

Calculate shadow

Use the sample place or enter coordinates. All times use the chosen time zone.

Choose place and timeCoordinates stay on this device

Sample place

LatitudeLongitude

Time zoneUse an IANA name, such as Europe/London.

DateLocal time

Object height

Use the same unit for the shadow result.

Read the sky planToronto · America/Toronto

Your local result will appear hereUse the sample place, then press the gold button.

Three simple steps

How to use it

Enter the object's height.
Choose its place and time.
Read the shadow length and direction.

Your place stays on this device

SunCalc does the sky math inside this browser tab. Bookify does not upload or save coordinates, dates, or times. Results assume a clear, level horizon; terrain, weather, and buildings can change what you see.