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`"Joist count" = f( W , L , 16 )`
Enter a value for all fields
The Floor Joist Hanger Count calculator 
computes the number of joist hangers required to hang joists or i-joists for a floor or deck based on the dimension of the room or deck and the on-center joist separation.
Floor Joist Hanger Count Instructions
- (W) - Enter the width of the floor across the joists
- (L) - Enter the length of the floor parallel to the joists
- (oC) - Enter the On-center Separation distance between joists
Floor Joist Hanger Count: The calculator computes the total number of hangers needed for the joists.
The Math / Science
The algorithm assumes two hangers per joist, one on each end, and that none are needed for the end plates.
Joist Calculators
- Floor Joist Count:
Computes the number of joists (joists and end plates) and joist ties required for a floor or deck based on the dimension of the room or deck and the on-center joist separation. - Floor Joist Cost: Estimates the cost of Floor Joist boards (joists and end plates) required for a floor or deck based on the dimensions of the deck, spacing of joists and unit cost of joist boards.
- Joist Hanger Count:
Computes the number of joist hangers required for a deck based on the width of the deck and the spacing of joists. - I-Joist Count: Computes the the number of I-Joist boards required to cover a span (width) based on the size of the span and spacing of the I-Joists.
- Maximum Joist Span: Computes the span length of a (1,200 pounds per square inch fiber stress) wood joist based on the live load, spacing, board width (e.g., 2x6 vs 2x10) and whether the joist need to be extra stiff for materials attached such as plaster below them.
- Joists on Beams:
Computes the number of joists (2x dimensional lumber or i-joists), number of beams, number of joist hangers, and length of plate boards needed for a floor or deck with a span that might require one or more beams. - On Center Spacing: Computes the even spacing between a number of objects (e.g. posts, studs, joists, rafters, trusses, lights, rebars) over a specified length or distance.
Building Calculators
- Area of a Roof
- Pitch of a Roof
- Number of Trusses Needed for a Roof
- 4x8s needed for a roof
- Shingles needed for a roof
- Number and Length of Metal Roof Panels
- Number and Length of Purlins
- Number and Length of Rafters
- Number and Length of Rafter and Collar ties
- Number and Length of wall top and bottom wall plates
- Number of Studs for a Room
- Number of Studs in a Wall
- Room Interior Area (wall and ceiling)
- Cubic Feet in a Room (volume)
- Number of 4x8 or 4x12 Sheets for a Room
