Biology & Life Science

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Tree Height Calculator.

Estimate tree height with the tangent method from distance, top angle, and eye height.

On-device calculationNo signup
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Set your values

Results update as you type.

Tree height: 21.6 m

Tree height

21.600m
Vertical rise: 20 m

Vertical rise

20.000m

The tangent model is height = eye height + horizontal distance × tan(top angle). It assumes level ground and a sightline to the top; no species growth model is used.

Use Cases

Estimate tree height for landscaping

Quickly gauge the height of trees in your yard to plan pruning, removal, or planting. Helps in assessing clearance and aesthetics.

Example: Measure 20 m from a tree, angle 30°, eye height 1.7 m → height ≈ 13.2 m

Forestry and ecology surveys

Useful for estimating tree heights in field studies or recreational surveys without specialized equipment.

Example: Record heights of multiple trees for a biodiversity project.

Frequently Asked Questions

How does the tree height calculator work?
It uses the tangent method: height = horizontal distance × tan(top angle) + observer eye height. You input the horizontal distance from the tree, the angle to the top, and your eye height, and it calculates the estimated tree height.
What units should I use for the inputs?
All inputs should be in meters for distance and eye height, and degrees for the top angle. The result will be in meters.
Can I use this calculator for any tree?
Yes, as long as you can measure the horizontal distance to the tree and the angle to its top. It works best when the ground is relatively level and you can see the top clearly.

Tips & Common Mistakes

Tips

  • Measure the horizontal distance accurately using a tape measure or laser rangefinder for best results.
  • Ensure the top angle is measured to the very top of the tree, not to a branch or leaf cluster.
  • Stand on level ground to avoid errors from slope; if on a slope, adjust your eye height accordingly.
  • For tall trees, take multiple measurements from different distances and average the results.

Common Mistakes to Avoid

  • Using the distance along the ground instead of the horizontal distance when on uneven terrain.
  • Forgetting to add your eye height to the calculated height from the angle.
  • Measuring the angle to a point below the actual top, such as a branch, leading to underestimation.

Last updated: August 13, 2026