Use decks.com beam sizing calculator.

Beam Sizes (Based on No. 2 or better Ponderosa Pine and Southern Pine Treated for weather and/or ground exposure)

X = Joist Length

X

Species

Post Spacing

4

5

6

7

8

9

10

11

12

13

14

6

Southern Pine

1-2x6

1-2x6

1-2x6

2-2x6

2-2x6

2-2x6

2-2x8

2-2x8

2-2x10

2-2x10

2-2x10

Ponderosa Pine

1-2x6

1-2x6

2-2x8

2-2x8

2-2x8

2-2x8

2-2x10

2-2x10

2-2x12

2-2x12

3-2x10

7

Southern Pine

1-2x6

1-2x6

1-2x6

2-2x6

2-2x6

2-2x8

2-2x8

2-2x10

2-2x10

2-2x10

2-2x12

Ponderosa Pine

1-2x6

1-2x6

1-2x8

2-2x8

2-2x8

2-2x10

2-2x10

2-2x10

2-2x12

3-2x10

3-2x10

8

Southern Pine

1-2x6

1-2x6

2-2x6

2-2x6

2-2x8

2-2x8

2-2x8

2-2x10

2-2x10

2-2x12

2-2x12

Ponderosa Pine

1-2x6

2-2x6

2-2x8

2-2x8

2-2x8

2-2x10

2-2x10

2-2x10

3-2x10

3-2x10

3-2x12

9

Southern Pine

1-2x6

1-2x6

2-2x6

2-2x6

2-2x8

2-2x8

2-2x10

2-2x10

2-2x12

2-2x12

3-2x10

Ponderosa Pine

1-2x6

2-2x6

2-2x8

2-2x8

2-2x10

2-2x10

2-2x10

3-2x10

3-2x10

3-2x12

3-2x12

10

Southern Pine

1-2x6

1-2x6

2-2x6

2-2x6

2-2x8

2-2x8

2-2x10

2-2x12

2-2x12

3-2x10

3-2x10

Ponderosa Pine

1-2x6

1-2x6

2-2x8

2-2x8

2-2x10

2-2x10

2-2x12

3-2x10

3-2x12

3-2x12

Eng Bm

11

Southern Pine

1-2x6

2-2x6

2-2x6

2-2x8

2-2x8

2-2x10

2-2x10

2-2x12

2-2x12

3-2x10

3-2x12

Ponderosa Pine

2-2x6

2-2x6

2-2x8

2-2x8

2-2x10

2-2x12

2-2x12

3-2x10

3-2x12

3-2x12

Eng Bm

12

Southern Pine

1-2x6

2-2x6

2-2x6

2-2x8

2-2x8

2-2x10

2-2x10

2-2x12

3-2x10

3-2x10

3-2x12

Ponderosa Pine

2-2x6

2-2x6

2-2x8

2-2x10

2-2x10

2-2x12

2-2x12

3-2x12

3-2x12

Eng Bm

Eng Bm

13

Southern Pine

1-2x6

2-2x6

2-2x6

2-2x8

2-2x8

2-2x10

2-2x10

2-2x12

3-2x10

3-2x12

3-2x12

Ponderosa Pine

2-2x6

2-2x6

2-2x8

2-2x10

2-2x12

2-2x12

2-2x12

3-2x12

3-2x12

Eng Bm

Eng Bm

14

Southern Pine

1-2x6

2-2x6

2-2x6

2-2x8

2-2x10

2-2x10

2-2x12

3-2x10

3-2x12

3-2x12

3-2x12

Ponderosa Pine

2-2x6

2-2x8

2-2x8

2-2x10

2-2x12

3-2x10

3-2x12

3-2x12

Eng Bm

Eng Bm

Eng Bm

15

Southern Pine

2-2x6

2-2x6

2-2x8

2-2x8

2-2x10

2-2x12

2-2x12

3-2x10

3-2x12

3-2x12

Eng Bm

Ponderosa Pine

2-2x6

2-2x8

2-2x8

2-2x10

3-2x10

3-2x10

3-2x12

3-2x12

Eng Bm

Eng Bm

Eng Bm

16

Southern Pine

2-2x6

2-2x6

2-2x8

2-2x8

2-2x10

2-2x12

2-2x12

3-2x10

3-2x12

3-2x12

Eng Bm

Ponderosa Pine

2-2x6

2-2x8

2-2x10

2-2x10

3-2x10

3-2x10

3-2x12

3-2x12

Eng Bm

Eng Bm

Eng Bm

Joist sections cantilevered over beams must be calculated as (2x length) for beam sizing.