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`"iJC" = (( W *12) / ( 16 ) + 1) +"adder"`

Enter a value for all fields

The **I-joist Calculator** computes the number of i-joists are required for a floor based on the dimension of the room. The user can also enter the on-center separation of joists, but the system has 16" on-center separation as the default.

**INSTRUCTIONS:** Choose your preferred units and enter the following:

- (
**W**) Floor Width (crossing the joists) - (
**oC**) On-Center spacing (separation of joists)

**I-Joists Count (iJC)**: The calculator returns the number of I-joists needed for the floor.

This algorithm makes no assumptions for the maximum span. It is assumed that joist of the appropriate span can be found (steel, I-joists, or other materials). This equations only provides the number of the spanning joists (brown-red in diagram) and not those on the very edges (e.g. first and last plates). See diagram. It does assume that the first and last i-joist are right next to the edge plates.

- 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