Find Where a Tree Will Fall With the 45-Degree Vial on a Level

The Problem

Before a tree comes down, one question decides everything: how tall is it, and does that height reach the house, the fence, the power line? Eyeballing tree height fails consistently — people underestimate tall trees badly, and "I think it clears" is a terrible basis for an irreversible cut.

The Technique

A torpedo level with a 45-degree vial turns the question into a right triangle:

1. Stand back from the tree and aim the level up along its length toward the treetop, like a sighting stick.
2. Check the 45° vial. Bubble not centered — walk forward or back and sight again.
3. When the bubble centers while the level points at the top, your line of sight is at exactly 45 degrees — which means your horizontal distance to the trunk equals the tree's height above your eye line.
4. Mark where you're standing — and correct for your eye height: holding the level six feet up means the true fall reach extends about six feet behind your mark.
5. Measure or pace from the trunk to the mark. That's the height, and — felled in your direction — the far edge of where the top lands.

This creator's mark came within a foot of where the felled top actually landed.