Tree Height Calculator
Pick a method: stand a measured distance from the tree and enter the angle to its top, or compare the tree's shadow with the shadow of a stick of known height. The calculator returns the estimated height.
Last updated: September 25, 2026
Frequently asked questions
Which method is more accurate?
Both are estimates. The angle method depends on how well you can read the angle to the true top; the shadow method depends on flat ground and measuring both shadows at the same moment. Repeating the measurement from a second spot is a good check.
How do I measure the angle to the treetop?
Use a clinometer, a phone inclinometer app, or a homemade protractor with a weighted string. Sight the highest visible point of the crown and read the angle above horizontal.
Why do I need to add eye height?
The angle is measured from your eye level, not the ground, so the calculated rise above your eye must be added to your eye height to get the full height of the tree.
Does the shadow method work on cloudy days?
No. You need distinct shadows and you must measure the stick and tree shadows at the same time, since shadow length changes through the day.
What if the tree is on a slope?
Slopes distort both methods. Stand on ground level with the base of the tree if possible, or take measurements from a spot at the same elevation as the base.
How is this related to the Right Triangle Calculator?
The angle method is right-triangle trigonometry and the shadow method uses similar triangles. This page packages both for trees; the Right Triangle Calculator solves general triangles.