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The charts below show commonly accepted lumber dimensions. Always check the wood you buy to be sure you understand the sizing!

Nominal

Actual

Metric

1" x 2"

3/4" x 1-1/2"

19 x 38 mm

1" x 3"

3/4" x 2-1/2"

19 x 64 mm

1" x 4"

3/4" x 3-1/2"

19 x 89 mm

1" x 5"

3/4" x 4-1/2"

19 x 114 mm

1" x 6"

3/4" x 5-1/2"

19 x 140 mm

1" x 7"

3/4" x 6-1/4"

19 x 159 mm

1" x 8"

3/4" x 7-1/4"

19 x 184 mm

1" x 10"

3/4" x 9-1/4"

19 x 235 mm

1" x 12"

3/4" x 11-1/4"

19 x 286 mm

1-1/4" x 4"

1" x 3-1/2"

25 x 89 mm

1-1/4" x 6"

1" x 5-1/2"

25 x 140 mm

1-1/4" x 8"

1" x 7-1/4"

25 x 184 mm

1-1/4" x 10"

1" x 9-1/4"

25 x 235 mm

1-1/4" x 12"

1" x 11-1/4"

25 x 286 mm

1-1/2" x 4"

1-1/4" x 3-1/2"

32 x 89 mm

1-1/2" x 6"

1-1/4" x 5-1/2"

32 x 140 mm

1-1/2" x 8"

1-1/4" x 7-1/4"

32 x 184 mm

1-1/2" x 10"

1-1/4" x 9-1/4"

32 x 235 mm

1-1/2" x 12"

1-1/4" x 11-1/4"

32 x 286 mm

2" x 4"

1-1/2" x 3-1/2"

38 x 89 mm

2" x 6"

1-1/2" x 5-1/2"

38 x 140 mm

2" x 8"

1-1/2" x 7-1/4"

38 x 184 mm

2" x 10"

1-1/2" x 9-1/4"

38 x 235 mm

2" x 12"

1-1/2" x 11-1/4"

38 x 286 mm

3" x 6"

2-1/2" x 5-1/2"

64 x 140 mm

4" x 4"

3-1/2" x 3-1/2"

89 x 89 mm

4" x 6"

3-1/2" x 5-1/2"

89 x 140 mm

Plywood thicknesses

Nominal

Actual
Note: Hardwood veneer plywood is often sized at "full" thickness, meaning 3/4" is actually 3/4". Check the actual thickness before buying any wood!

1/4"

15/64"

3/8"

13/32

1/2

31/64

5/8"

19/32

3/4"

23/32

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