Span Calculator For Joists
Calculate the maximum span for wood joists based on species, grade, size, spacing, and load conditions.
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How to use this tool?
- 1 Enter the requested data in the fields above carefully.
- 2 Click the calculate button to process the information instantly.
- 3 Analyze the detailed result and the formula explanation presented below.
- 4 You can print, share, or even embed the calculator on your own site for free.
Unlike traditional static calculators, our tools adapt to specific user needs. They include detailed explanations of the formulas used, ensuring transparency in results. Furthermore, our design is focused on user experience, eliminating distractions and focusing on what really matters: your data and conclusions.
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Frequently Asked Questions
A joist span is the distance between supports that a joist can safely cover without exceeding bending or deflection limits. It depends on the species, grade, size, spacing, and load.
The span is calculated using the bending formula: Span = sqrt((8 * Fb * S) / (w * 12)), where Fb is the allowable bending stress, S is the section modulus, and w is the uniform load per linear inch.
Typical residential loads are 40 psf (30 live + 10 dead) for floors. This calculator uses a combined load input; default is 40 psf.
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