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eng.concrete-bags-slab Calculator
Calculates the number of concrete bags required for a slab from dimensions and bag yield, with waste factor. A standard 80 lb bag of concrete mix yields approximately 0.6 cubic feet — this converts slab volume to bag count with a 10% waste allowance.
Inputs
Length Ft
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Width Ft
Horizontal extent perpendicular to the length.
Thickness In
Perpendicular measurement through the material. For insulation: thicker is better. For beams: directly affects bending resistance.
Bag Size Lb
Reference formula or conversion factor shown for context.
Results
bags needed (
Sample size or count used in the calculation.
slab volume (ft³)
The computed three-dimensional volume.
60-lb bags needed
Sample size or count used in the calculation.
80-lb bags needed
Sample size or count used in the calculation.
60-lb bag yield
Reference formula or conversion factor shown for context.
4
Reference formula or conversion factor shown for context.