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Lumber Weight Calculator

Calculate the weight of lumber for transportation and structural planning

Calculate lumber weight with wood species database, moisture content, and unit conversion

Unit System
Lumber Presets
Lumber Dimensions
Enter the dimensions of your lumber pieces
Wood Species
Select the type of wood
Standard is 12% for kiln-dried lumber

Enter Lumber Dimensions

Fill in the dimensions and select wood species to calculate weight

Wood Database Information
• Densities are at 12% moisture content (kiln-dried)
• Moisture content affects weight: higher moisture = heavier
• Engineered woods have consistent density
• Tropical woods are typically denser than domestic species
Display Options

About the Lumber Weight Calculator

This lumber weight calculator estimates the weight of a board from its dimensions and species, using each wood's density at a typical moisture content. It helps you judge whether a panel is a one- or two-person lift, plan a load for transport, or check a shelf or rack will carry the timber you intend to store on it.

How weight is estimated

Weight is density multiplied by volume. The calculator works out the board's volume from thickness, width, and length, then multiplies by the density of the chosen species. Densities are commonly quoted in pounds per cubic foot or kilograms per cubic metre at around 8–12% moisture content, which represents air-dried or kiln-dried stock ready for indoor use.

Species varies enormously: balsa and western red cedar are very light, while oak, maple, and tropical hardwoods like ipe are two to three times heavier for the same size. That is why selecting the right species matters far more than people expect when estimating a load.

Why moisture content changes the answer

Freshly sawn (green) timber can weigh substantially more than dried timber because of the water it holds — sometimes 50–80% more. The figures here assume seasoned stock; if you are moving green lumber straight from the mill, treat the result as a minimum and add a generous margin.

Worked example

You want the weight of an 8 ft red oak board, 1 inch thick and 10 inches wide (red oak ≈ 45 lb/ft³).

  1. Volume = (1 in × 10 in × 96 in) ÷ 1728 = 0.556 ft³.
  2. Weight = 0.556 ft³ × 45 lb/ft³ ≈ 25 lb.

The board weighs about 25 lb — a comfortable one-person carry.

Frequently asked questions

Does the calculator account for moisture content?

It uses representative densities for seasoned (air- or kiln-dried) lumber at roughly 8–12% moisture. Green or wet timber weighs significantly more, so add a margin if the wood is freshly cut.

Why is the same size board so much heavier in oak than pine?

Hardwoods like oak are denser than softwoods like pine — often roughly twice the weight for the same volume. Density, set by species, is the main driver of weight.

Can I use this to check if a shelf will hold my timber?

Yes — total the weight of the boards you plan to store, then check the shelf with the shelf sag calculator to confirm the deflection stays within safe limits.