Tree Height Calculator

The Tree Height Calculator uses trigonometry or shadow proportions to estimate a tree's height without climbing it — useful for landscaping, timber assessment, or simple curiosity. Select a measurement method (viewpoint level, above, or below the base, or the shadow method), then enter your horizontal distance to the tree, observer eye height, and angles to the tree top and base — or your shadow measurements if using the shadow method. You'll get the calculated tree height in both meters and feet.

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Angle from horizontal to tree top (positive = looking up)

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Angle from horizontal to tree base (negative = looking down)

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Results

Calculated Tree Height

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Tree Height in Feet

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Frequently Asked Questions

How to measure the height of a tree?

There are several methods: trigonometric measurement using angles and distance, shadow comparison method, or using specialized tools like clinometers. The trigonometric method is most accurate and practical.

How to take measurements for the tree height calculator?

Stand at a measured distance from the tree, measure angles to the tree top and base using a clinometer or smartphone app, and record your eye height. Ensure you have a clear line of sight.

How to calculate the height of a tree using the shadow measurement?

Measure your height and shadow length, then measure the tree's shadow length. Tree height equals (your height × tree shadow length) ÷ your shadow length. This method works best on level ground with consistent sunlight.

What tools do I need for estimating tree height?

You need a measuring tape for distances, a clinometer or smartphone inclinometer app for angles, and optionally a rangefinder for accurate distance measurement. Many smartphones have built-in tools for angle measurement.

What's the difference between viewpoint positions?

Level viewpoint means your eye level equals the tree base. Above viewpoint means you're on higher ground than the tree base. Below viewpoint means the tree base is above your position. Each requires different calculation methods.

How accurate are trigonometric tree height measurements?

When done correctly, trigonometric measurements can be accurate within 1-2% of actual height. Accuracy depends on precise angle and distance measurements and accounting for ground slope.

Can I measure leaning trees with this calculator?

Yes, the calculator works for leaning trees. The key is measuring the angle to the actual top of the tree, not the projected vertical point. The trigonometric calculations automatically account for the lean.

What are common sources of error in tree height measurement?

Common errors include inaccurate distance measurement, difficulty seeing the true tree top through foliage, ground slope not being level, and parallax errors when reading angles. Take multiple measurements for better accuracy.