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Pick a shape, enter dimensions, choose US or metric, and set a waste factor. We’ll give cubic yards, cubic feet/meters, bag counts, and an optional cost estimate.
Bag yields (approx): 80 lb ≈ 0.60 ft³, 60 lb ≈ 0.45 ft³, 40 lb ≈ 0.30 ft³.
Slab
Footing / Trench
Column (cylinder)
Stairs (triangular prism)
Rectangular slab
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Footing / Trench
Calculate
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Column (cylinder)
US: diameter in inches, height in feet
Calculate
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Stairs (triangular prism)
US: width in feet, rise/tread in inches
Calculate
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Bag counts & cost
Optional ad slot
Notes
Stairs are approximated as a triangular prism: volume ≈ ½ × total rise × total run × width.
Always round up and add waste for spillage and grade variation. Typical overage is 5–15%.
Concrete bag yields vary by brand and mix. Ready-mix pricing and delivery fees vary by region.
This is planning info, not a substitute for local building codes or an engineer.