softwood · Pseudotsuga menziesii
Douglas-Fir wood properties
Also known as: doug fir, oregon pine, coast douglas-fir.
| Type | softwood |
|---|---|
| Botanical name | Pseudotsuga menziesii |
| Modulus of elasticity (MOE) | 1,765,000 psi |
| Specific gravity | 0.51 |
| Density (approx) | 32 lb/ft³ (2.7 lb per board foot) |
| Janka hardness | 620 lbf |
| Shrinkage (tangential / radial) | 7.3% / 4.5% |
| Movement coefficient (CT / CR) | 0.00267 / 0.00165 |
A 1 in x 6 in x 8 ft board of Douglas-Fir weighs about 10.6 lb (roughly 32 lb per cubic foot). Its Janka hardness of 620 lbf is harder than about 28% of the woods in our database.
Use this data
Similar woods
Woods with comparable hardness and density to Douglas-Fir:
How these numbers were sourced
MOE (1,765,000 lbf/in2, averaged across four regions), Janka (620 lbf) and shrinkage (T 7.3%, R 4.5%) from The Wood Database, which cites the USDA FPL Wood Handbook. Specific gravity 0.51 is the Wood Database value at 12% MC for Coast Douglas-fir (it also lists basic 0.45; the FPL Wood Handbook gives 0.48). CT 0.00267 and CR 0.00165 (Douglas-fir, coast) from the Hoadley / FPL dimensional change coefficient table reproduced by Popular Woodworking. Price indicative.
Values shown as estimates rather than sourced constants: typicalPricePerBF_usd.
Sources
These calculators are for planning and estimation. Engineering results (shelf sag, wood movement) use published average material properties; real boards vary by grade, grain, moisture and defects. Verify load-bearing designs with a professional.