Ceiling Joist Calculator
Calculate ceiling joist sizes, spans, and quantities. Check maximum spans based on joist size and spacing.
Joist Specifications
Joist Size:
Spacing (o.c.):
12 ft
6 ft24 ft
ft
20 ft
8 ft50 ft
Ceiling Type:
Joists Needed
16 joists
2x6 x 12' each
Span Exceeds Maximum
Max span for 2x6 @ 16" o.c.: 10.0 ft
📏Total Linear Feet
192 ft
🪵Board Feet
132
⬇️Dead Load
3.5 PSF
📊Total Load
13.5 PSF
Section Properties:
Joist Height5.5"
Moment of Inertia (I)20.80 in⁴
Section Modulus (S)7.56 in³
Ceiling Joist Span Table
| Joist Size | 12" o.c. | 16" o.c. | 24" o.c. |
|---|---|---|---|
| 2x4 | 7' 0" | 6.5' 0" | 5.5' 0" |
| 2x6 | 11' 0" | 10' 0" | 8.5' 0" |
| 2x8 | 14.5' 0" | 13' 0" | 11' 0" |
| 2x10 | 18.5' 0" | 16.5' 0" | 14' 0" |
| 2x12 | 22' 0" | 20' 0" | 17' 0" |
Note: Spans based on SPF #2 grade, uninhabitable attic without storage (10 PSF live load)