Concrete Slab Maximum Length Calculator
This calculator determines the maximum allowable length of a concrete slab based on the reinforcement ratio, steel stress, and slab spacing. It helps engineers and contractors design slabs that are structurally sound and resistant to cracking or failure.
Calculate Max Span of Concrete Slab
Concrete Slab Length Formula
$$L = \left( 0.00047 \cdot h_r \cdot (f_s \cdot S)^2 \right)^{1/3}$$
Where:
- $$h_r$$ — reinforcement ratio
- $$f_s$$ — steel stress
- $$S$$ — slab spacing
- $$L$$ — maximum slab length (output)
This formula is used in structural design to predict the longest possible slab span without failure due to stress or insufficient reinforcement. It is based on empirical and code-based practices. Useful in the planning phase of floors, pavements, and concrete panels.