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Use our tree weight calculator to estimate trunk weight in kg or lb. Enter tree size, wood density, and form factor to get your result.
| Term | Meaning |
|---|---|
| V = (π × d² ÷ 4) × H × F | Estimated trunk volume (d=diameter, H=height/length, F=form factor) |
| W = V × ρ | Estimated trunk wood mass (ρ=wood density) |
| F | Form factor accounting for trunk taper — not a perfect cylinder |
Want to know how much a tree weighs? Our tree weight calculator makes it easy. Enter a few values to get an estimate in seconds.
You need the trunk size, tree height, wood density, and form factor. The tool uses these values to find the trunk volume and weight.
You can view the result in kilograms (kg) and pounds (lb). It can help with tree care, wood work, and rough timber estimates.
Keep in mind that this tool estimates trunk weight only. It does not count the full weight of the tree.
The tree weight calculator uses two simple formulas.
Tree trunk volume = (π × diameter² ÷ 4) × height × form factor
Tree trunk weight = trunk volume × wood density
Here, π is about 3.14159. Diameter and height must use meters. Wood density must use kg/m³. The form factor adjusts for the trunk's shape.
Think of the trunk as a rough cone or tube. Its shape is not the same from top to bottom. The form factor helps account for this change.
Enter trunk diameter. Measure the trunk width. Pick the right unit.
Enter tree height. Add the trunk length or height in the chosen unit.
Add wood density. Use a value that fits the tree species and moisture level.
Set the form factor. Use a sound estimate for the trunk shape.
Click Calculate. Read the estimated trunk weight in kg and lb.
Check each value before you run the tool. A small change in trunk size can lead to a large change in weight.
Suppose a tree has a trunk diameter of 0.30 m. Its trunk height is 12 m. Use a form factor of 0.45 and wood density of 600 kg/m³.
Step 1: Find the trunk area.
Area = 3.14159 × 0.30² ÷ 4
Area ≈ 0.07069 m²
Step 2: Find the trunk volume.
Volume = 0.07069 × 12 × 0.45
Volume ≈ 0.3817 m³
Step 3: Find the trunk weight.
Weight = 0.3817 × 600
Estimated trunk weight ≈ 229.02 kg, or 504.90 lb.
This is an example, not a fixed weight for all trees of this size. Real weight can vary with tree type, shape, and water content.
A tree weight calculator gives you a quick estimate of trunk mass. It saves time and makes rough wood estimates easier. For the best result, use sound size measures and a suitable wood density.
Remember, trunk weight is not the same as whole-tree weight. Branches, leaves, and roots need a wider model. Use a tested forestry method when you need a more exact result.
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