// multi-utility computation suite · offline · instant · precise
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tool.concrete-mix Calculator
Calculates number of 60 lb or 80 lb concrete bags (or cubic yards of ready-mix) needed for a given project volume. Ready-mix is more economical above about 1 cubic yard — this shows the break-even point.
Inputs
Length Ft
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Width Ft
Horizontal extent perpendicular to the length.
Depth In
Vertical extent downward, or thickness of a layer. For tanks: affects pressure at the base (P = ρgh).
Results
cubic feet
Volume in cubic feet. 1 cubic foot = 28.3 litres = 7.48 US gallons.
cubic yards
Volume in cubic yards. 1 cubic yard = 27 cubic feet = 764.6 litres. Common for concrete and bulk material ordering.
60 lb bags
Reference formula or conversion factor shown for context.
80 lb bags
Reference formula or conversion factor shown for context.