Lumber Weight Calculator - Easily Estimate Board Feet and Weight

Last updated: 19 Apr 2025 | Author: Brij | Review By: Irshad

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Easily calculate the weight of any wood board using length, width, thickness, and wood density. Just enter the wood dimensions and density.

Length:

Width:

Thickness:

Wood Type:

Quantity:

Weight Calculation Results

Board Feet:

Total Weight:

lbs

Whether you're building furniture, framing a house, or planning a woodworking project, knowing the weight of lumber is essential for transportation, structural calculations, and estimating material costs. Our Lumber Weight Calculator simplifies this process by allowing you to enter the length, width, thickness, and the density of the wood in pounds per cubic foot (lbs/ft³). The tool then returns:

Board Feet
Total Weight of the Lumber

Let’s break down how this calculation works with clear formulas and examples.

What is Board Foot?

A board foot is a unit of volume for lumber, equal to 144 cubic inches (12″ × 12″ × 1″). It’s a standard measurement in the woodworking and lumber industry.

Formula to Calculate Board Feet

To calculate board feet from lumber dimensions:

Formula:

$\text{Board Feet} = \frac{\text{Length (in inches)} \times \text{Width (in inches)} \times \text{Thickness (in inches)}}{144}$

Formula to Calculate Lumber Weight

Once you have board feet, you can calculate the total weight using the wood density:

Formula:

$\text{Weight (lbs)} = \text{Board Feet} \times \left( \frac{\text{Density (lbs/ft}^3)}{12} \right)$

Note: We divide the density by 12 to convert from cubic feet to board feet because 1 cubic foot = 12 board feet.

Example

Let’s say you have a piece of lumber that is:

Length = 96 inches (8 feet)
Width = 6 inches
Thickness = 2 inches
Wood Density = 35 lbs/ft³ (e.g., for Douglas Fir)

Step 1: Calculate Board Feet

$\text{Board Feet} = \frac{96 \times 6 \times 2}{144} = \frac{1152}{144} = 8 \, \text{board feet}$

Step 2: Calculate Weight

$\text{Weight} = 8 \times \left( \frac{35}{12} \right) = 8 \times 2.9167 = 23.33 \, \text{lbs (approx)}$

Summary

Our Lumber Weight Calculator is a helpful tool for woodworkers, contractors, and DIYers to quickly estimate how much weight they’re working with. All you need to know are the lumber dimensions and the wood species’ density!

FAQs

What is the average wood density for common types of lumber?

Wood density varies by species. Here are a few common examples (in lbs/ft³):

Pine: ~30
Oak: ~45–50
Maple: ~44
Douglas Fir: ~35
Using the correct density ensures accurate weight calculation.

Why is it important to know the weight of lumber?

Knowing lumber weight helps with:

Estimating shipping or transport loads
Ensuring structural safety
Managing material costs
Planning safe storage and handling on job sites

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