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Beam Design
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Diaphragm
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Connections
Hold-down & Anchorage
Sill-Plate Anchorage
Chord & Collector
Stud / Bearing Wall
Joist & Rafter
Header / Lintel
Bearing & Notch
Continuous Beam
Fire Resistance
CLT Panel
Wood Shrinkage
Floor Vibration
Deck Designer
Building Project
Mechanical
HVAC Load · Manual J
Continuous Beam
Multi-span continuous beam (2-3 spans) via the three-moment method.
Code edition
NDS 2018
NDS 2024
Design diagram
— updates live with your inputs
Member & Material
Material type
Sawn Lumber
Glulam
LVL
PSL
Species
Douglas Fir-Larch
Hem-Fir
Southern Pine
Spruce-Pine-Fir
Sawn lumber only
Grade
Select Structural
No.1
No.2
No.3
Stud
Sawn lumber only
Standard section
Custom…
2x4 (1.5 × 3.5 in)
2x6 (1.5 × 5.5 in)
2x8 (1.5 × 7.25 in)
2x10 (1.5 × 9.25 in)
2x12 (1.5 × 11.25 in)
2x14 (1.5 × 13.25 in)
3x6 (2.5 × 5.5 in)
3x8 (2.5 × 7.25 in)
3x10 (2.5 × 9.25 in)
3x12 (2.5 × 11.25 in)
4x4 (3.5 × 3.5 in)
4x6 (3.5 × 5.5 in)
4x8 (3.5 × 7.25 in)
4x10 (3.5 × 9.25 in)
4x12 (3.5 × 11.25 in)
4x14 (3.5 × 13.25 in)
6x6 (5.5 × 5.5 in)
6x8 (5.5 × 7.5 in)
6x10 (5.5 × 9.5 in)
6x12 (5.5 × 11.5 in)
6x14 (5.5 × 13.5 in)
8x8 (7.5 × 7.5 in)
8x10 (7.5 × 9.5 in)
8x12 (7.5 × 11.5 in)
8x14 (7.5 × 13.5 in)
10x10 (9.5 × 9.5 in)
10x12 (9.5 × 11.5 in)
12x12 (11.5 × 11.5 in)
GL 3-1/8 x 6 (3.125 × 6 in)
GL 3-1/8 x 7-1/2 (3.125 × 7.5 in)
GL 3-1/8 x 9 (3.125 × 9 in)
GL 3-1/8 x 10-1/2 (3.125 × 10.5 in)
GL 3-1/8 x 12 (3.125 × 12 in)
GL 5-1/8 x 9 (5.125 × 9 in)
GL 5-1/8 x 12 (5.125 × 12 in)
GL 5-1/8 x 15 (5.125 × 15 in)
GL 5-1/8 x 18 (5.125 × 18 in)
GL 5-1/8 x 21 (5.125 × 21 in)
GL 5-1/8 x 24 (5.125 × 24 in)
GL 6-3/4 x 15 (6.75 × 15 in)
GL 6-3/4 x 18 (6.75 × 18 in)
GL 6-3/4 x 21 (6.75 × 21 in)
GL 6-3/4 x 24 (6.75 × 24 in)
GL 6-3/4 x 27 (6.75 × 27 in)
GL 6-3/4 x 30 (6.75 × 30 in)
GL 8-3/4 x 24 (8.75 × 24 in)
GL 8-3/4 x 30 (8.75 × 30 in)
GL 8-3/4 x 36 (8.75 × 36 in)
Width b
(in)
Depth d
(in)
Number of plies
Member spacing
(in)
For repetitive Cr
Spans
Number of spans
2 or 3
Span 1 length
(ft)
Span 2 length
(ft)
Span 3 length
(ft)
Used when 3 spans
Loads
Dead load w_D
(plf)
Same on every span
Live/Snow load w_L
(plf)
Same on every span
Load duration
Permanent (0.9)
Ten years / Floor Live (1.0)
Two months / Snow (1.15)
Seven days / Construction (1.25)
Ten minutes / Wind & Seismic (1.6)
Impact (2.0)
Sets CD
Design Assumptions
Service condition
Dry (CM=1.0)
Wet
Temperature
T <= 100F (Ct=1.0)
100F < T <= 125F
125F < T <= 150F
Live defl. limit L/
Total defl. limit L/
Incised lumber
Yes
Run calculation
NDS 2018