1x8 Lumber Dimensions
Wide board stock. Above this width the 3/4 in thickness starts to look thin and cupping becomes the thing to watch.
Quick specificationwhat the size actually measures
| Nominal size | 1 × 8 in (25.4 × 203.2 mm) |
|---|---|
| Actual size (dry) | 0.75 × 7.25 in (19.05 × 184.15 mm) |
| Dressed section area | 5.44 in² (35.08 cm²) |
| Removed per face | 0.125 in off the thickness, 0.375 in off the width |
| Trade group | Board |
Dimensionsnominal against dressed, and why they differ
The nominal figure of 1 × 8 inches describes the rough green board. After drying and planing on four faces the section measures 0.75 by 7.25 inches — that is, 0.125 inch off each of the wide faces and 0.375 inch off each edge.
Every page in this database is generated from the dressed figure, because that is the section that has to carry the load and take the fixing. If you are sizing a beam, checking a fixing length or estimating a delivery, use 0.75 × 7.25 inches (19.05 × 184.15 mm) rather than the nominal call size.
By lengthboard feet, volume and weight for each tabulated length
| Length | Board feet | Actual volume | Weight (Spruce (Sitka)) |
|---|---|---|---|
| 1x8x6 | 4 | 0.2266 ft³ | 6.08 lb |
| 1x8x8 | 5.33 | 0.3021 ft³ | 8.11 lb |
| 1x8x10 | 6.67 | 0.3776 ft³ | 10.14 lb |
| 1x8x12 | 8 | 0.4531 ft³ | 12.16 lb |
| 1x8x14 | 9.33 | 0.5286 ft³ | 14.19 lb |
| 1x8x16 | 10.67 | 0.6042 ft³ | 16.22 lb |
Two different bases, deliberately. Board feet is calculated from the nominal section, because that is the pricing convention. Volume and weight use the actual section, because that is the material actually present. A 2x4x8 is 5.33 board feet but only 0.3021 cubic feet.
Weight by speciesthe same section, every species in the database
Wood database| Species | Density | 1x8x8 weight |
|---|---|---|
| Balsa | 0.16 g/cm³ | 3.02 lb · 1.37 kg |
| Cedar (Western Red) | 0.37 g/cm³ | 6.98 lb · 3.17 kg |
| Poplar (Yellow) | 0.42 g/cm³ | 7.92 lb · 3.59 kg |
| Basswood | 0.42 g/cm³ | 7.92 lb · 3.59 kg |
| Redwood | 0.42 g/cm³ | 7.92 lb · 3.59 kg |
| Spruce (Sitka) | 0.43 g/cm³ | 8.11 lb · 3.68 kg |
| Cedar (Eastern Red) | 0.47 g/cm³ | 8.86 lb · 4.02 kg |
| Hemlock (Western) | 0.47 g/cm³ | 8.86 lb · 4.02 kg |
| Cypress (Bald) | 0.48 g/cm³ | 9.05 lb · 4.11 kg |
| Fir (Douglas) | 0.53 g/cm³ | 9.99 lb · 4.53 kg |
| Pine (Southern Yellow) | 0.55 g/cm³ | 10.37 lb · 4.7 kg |
| Mahogany (Honduran) | 0.55 g/cm³ | 10.37 lb · 4.7 kg |
| Cherry (Black) | 0.56 g/cm³ | 10.56 lb · 4.79 kg |
| Larch | 0.58 g/cm³ | 10.94 lb · 4.96 kg |
| Teak | 0.63 g/cm³ | 11.88 lb · 5.39 kg |
| OSB (Oriented Strand Board) | 0.65 g/cm³ | 12.26 lb · 5.56 kg |
| Walnut (Black) | 0.66 g/cm³ | 12.45 lb · 5.65 kg |
| Ash (White) | 0.67 g/cm³ | 12.64 lb · 5.73 kg |
| Birch Plywood | 0.68 g/cm³ | 12.82 lb · 5.82 kg |
| Birch (Yellow Birch) | 0.69 g/cm³ | 13.01 lb · 5.9 kg |
| Bamboo | 0.7 g/cm³ | 13.2 lb · 5.99 kg |
| Maple (Hard Maple) | 0.705 g/cm³ | 13.3 lb · 6.03 kg |
| Beech (American) | 0.72 g/cm³ | 13.58 lb · 6.16 kg |
| Oak | 0.75 g/cm³ | 14.14 lb · 6.41 kg |
| MDF (Medium Density Fibreboard) | 0.75 g/cm³ | 14.14 lb · 6.41 kg |
| Hickory | 0.82 g/cm³ | 15.46 lb · 7.01 kg |
| Rosewood (East Indian) | 0.85 g/cm³ | 16.03 lb · 7.27 kg |
| Ipe | 1 g/cm³ | 18.86 lb · 8.55 kg |
Weights are derived, not quoted: density at about 12% moisture content × actual volume. Treat them as a floor — green stock stays heavier until it dries.
Where it is usedtypical applications for this section
Frequently asked questionsabout 1x8
What are the actual dimensions of a 1x8?
0.75 × 7.25 inches — 19.05 × 184.15 millimetres. The nominal call size of 1 × 8 inches is the rough green section, before planing and drying.
How much does a 1x8 weigh?
That depends on the species and the length, which is why this page gives both rather than one figure. A 1x8x8 of Spruce (Sitka) weighs about 8.11 lb (3.68 kg); the table above covers every species in the database at that length.
How do I convert a 1x8 to board feet?
Multiply the nominal thickness, width and length in inches and divide by 144. For a 1x8x8 that is (1 × 8 × 96) ÷ 144 = 5.33 board feet.