Calculator
Wood Weight Calculator
Estimate wood weight from species density, dimensions, moisture assumptions, and quantity.
Wood weight calculator
Density varies by species, moisture content, board, and supplier. These common density values are approximate planning values only.
Result
Enter dimensions and density, then calculate estimated wood weight.
These results are estimates only. Verify measurements, material specifications, structural requirements, safety requirements, and local building rules before buying materials or building.
How this calculator works
This calculator estimates wood weight from dimensions, quantity, and density. It supports metric and imperial dimensions, species-based approximate densities, and custom densities in kg/m3 or lb/ft3.
Wood density varies by species, moisture content, board, supplier, and growing conditions. Treat the species list as approximate planning data only, especially for transport, lifting, storage, and hardware estimates.
Formula
- Volume in cubic metres = length_m x width_m x thickness_m x quantity.
- Weight in kg = volume_m3 x density_kg_per_m3.
- Weight in lb = weight_kg x 2.20462.
- If using lb/ft3 density: density_kg_per_m3 = density_lb_per_ft3 x 16.0185.
- Volume in cubic feet = volume_m3 x 35.3147.
Worked example
Four pine boards at 2400 mm x 140 mm x 38 mm have a total volume of about 0.0511 cubic metres.
Using an approximate pine density of 500 kg/m3, the estimated weight is about 25.54 kg, or 56.31 lb.
Common mistakes
- Treating approximate species density as exact.
- Ignoring moisture content, which can change weight substantially.
- Using nominal lumber/timber dimensions instead of actual dimensions.
- Forgetting quantity when estimating lifting, transport, shelving, or hardware loads.
FAQs
Are the species densities exact?
No. They are approximate planning values. Density can vary by species, moisture content, board, and supplier.
Can I enter custom density?
Yes. Use custom density in kg/m3 or lb/ft3 if you have better material data.
Does moisture content affect wood weight?
Yes. Wet or green wood can weigh much more than dry wood, so verify material condition when weight matters.
Can I use this for lumber and timber?
Yes. Enter actual dimensions and quantity for the boards, posts, beams, panels, or timber pieces you are estimating.
Calculator disclaimer
These results are estimates only. Verify measurements, material specifications, structural requirements, safety requirements, and local building rules before buying materials or building.