## Use a yard-stick.

Walk up to the tree. Tie two ribbons around the tree, one at the base and the other as high as as possible. Measure the distance between the ribbons. Walk away from the tree. Face the tree. Hold the yard-stick plumb at arms length such that:

- the 0" mark is aligned at the base of the tree, and
- the 1" mark is aligned with the marker

Note how tall the tree is on the yard-stick.

The height of the tree is ribbon distance multiplied by yard stick measurement. If the ribbons are 70" apart, and the yardstick measurement is six and an eighth inches, then the height of the tree is 70 x 6.125 = 429 inches = 36 feet.

To obtain the 0-1 alignment:

- walk towards or away from the tree, or
- move the yard-stick closer or farther away from yourself, or
- tilt the yard-stick forward or backwards.

A ruler, tape measure, sheet of graph paper, sheet of lined notebook paper, or any object/straightedge with containing regular intervals, such as an egg-crate, piece of chicken wire, page of text such as page of newspaper, sheet of unfolded copy paper that had been folded in half repeatedly, venetian blinds ... will suffice for the 'yard-stick'.

Instead of the ribbons, one could lean a pole, or 2x, or ladder or use select low tree branch.

9Knowing the height today is clearly useful. But don't forget that trees are not static: they grow. You might want to consider a few years of growth into your location planning.... – RBerteig – 2012-01-10T09:34:45.783

Is the ground in your yard and in your neighbour's yard perfectly flat and level? – Remus Rusanu – 2012-01-12T20:15:00.763

I think this was in a Sherlock Holmes story – DaveInCaz – 2018-02-08T00:24:33.350

NB: Most of the answers are predicated on the tree being perpendicular to the ground. – Synetech – 2014-02-08T18:03:21.9504I'm fairly sure I had a problem just like this in high school (though that was many years ago), the trig textbook might just be the solution. – Tester101 – 2011-06-21T02:07:42.280