Model cylindrical or rectangular grain-storage volume, usable fill, mass, and bushels from your measured geometry and entered commodity-specific weights.
Choose your path
Model idealized bin geometry and convert usable volume to mass and bushels using only entered commodity-specific density and pounds-per-bushel values.
Separate physical bin geometry from the actual grain fill profile.
Choose the matching idealized shape, measure internal dimensions and grain depth, then enter a documented usable-fill percentage.
Can reproduce volume while recognizing floors, hoppers, cones, peaks, clearance, and compaction are outside the simple shape.
Avoid a universal bushel-per-cubic-foot shortcut.
Enter a representative measured bulk density and the correct commodity standard pounds per bushel, then inspect mass and bushel outputs.
Can explain why commodity, moisture, test weight, and sampling change the conversion.
Keep inventory arithmetic distinct from structural, aeration, spoilage, and entry decisions.
Compare the modeled figures with manufacturer rated capacity and professional/storage records; follow confined-space and operating requirements separately.
Does not use the result as a safe-fill, fan, structure, grade, sale-weight, or entry authorization.
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
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The selected shape supplies an idealized geometric volume in cubic feet. Measure internal dimensions and the actual grain depth; floors, hoppers, cones, peaks, clearance, compaction, and irregular profiles require separate treatment.
Cylinder = π × (diameter ÷ 2)² × grain depth; rectangle = width × length × grain depthUsable-fill percentage and bulk density are user-supplied scenario inputs, not built-in commodity facts. Use representative measurements or documented records for the actual commodity, moisture, condition, and profile.
Usable volume = geometric volume × entered fill %; mass = usable volume × entered lb/ft³The worksheet does not embed a universal 0.8 bu/ft³ conversion. Pounds per bushel must match the commodity and intended reporting standard; test weight, inventory, grade, and sale weight remain separate determinations.
Modeled bushels = modeled mass ÷ entered standard lb/buUpdated: August 2026
Enter internal diameter, actual grain depth, usable-fill allowance, representative bulk density, and the applicable pounds-per-bushel standard to document one reproducible scenario.
Switch the shape to rectangular and enter width, length, and depth. The same entered-density conversion then reports mass and bushels without pretending the profile is perfectly uniform.
Compare the modeled scenario with manufacturer rated capacity, measured inventory, aeration records, and professional guidance; do not use it as structural, spoilage, fan-design, sale-weight, or safe-entry approval.
That value can be a shelled-corn example, not a commodity-independent rule. Enter representative bulk density and the correct pounds-per-bushel standard for the actual grain and purpose.
Measure internal geometry and actual grain depth, then account for floors, hoppers, cones, peaks, voids, compaction, and clearance outside this idealized shape when material.
Build an auditable storage scenario from measured geometry and your own commodity-specific conversion inputs. The result is inventory-planning arithmetic—not a rated capacity, grade, sale weight, aeration design, structural check, spoilage forecast, or confined-space entry authorization.