Floor Joist Calculator

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Calculates the number of floor joists needed and their total cost, based on room dimensions, joist spacing, and the cost per joist.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Room Length (feet), Room Width (feet), Joist Spacing (inches), and Cost per Joist ($) in the units shown.

Step 2

Read Number of Joists and Total Joist Cost ($) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Room Length (feet): 10; Room Width (feet): 8; Joist Spacing (inches): 16 inches; Cost per Joist ($): 12

Number of Joists: 9; Total Joist Cost ($): 108

Room Length (feet): 16; Room Width (feet): 12; Joist Spacing (inches): 16 inches; Cost per Joist ($): 15

Number of Joists: 13; Total Joist Cost ($): 195

Room Length (feet): 24; Room Width (feet): 16; Joist Spacing (inches): 12 inches; Cost per Joist ($): 18

Number of Joists: 25; Total Joist Cost ($): 450

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