Grain Bin Capacity Calculator
Measure your storage. Understand every bushel.
Bin Dimensions & Grain
Capacity & Storage Review
At 56 lb/bu
Storage estimate — not a structural or certified inventory assessment.
Volume Breakdown & Haulage
Separate the body, grain peak and any filled hopper volume.
1 ft³ ≈ 0.8036 bu
1 bu ≈ 35.2391 L
Measured volume × bulk density, with any additional documented adjustment.
Component volumes & exact conversion basis
| Component | m³ | cu ft | Share |
|---|
1 U.S. dry bushel = 2,150.42 in³ = 1.2444560185 ft³ ≈ 0.03523907017 m³. Volume bushels are distinct from commodity marketing bushels sold by standard weight.
How capacity is calculated
Round volume = πr²h + πr²hₚ / 3
1 U.S. dry bushel ≈ 35.2391 litres (1.244456 ft³).
Assumptions & limitations
The round bin model uses measured internal diameter and grain depth at the wall. Add a centered, full-base conical grain peak separately. Do not enter an already averaged depth and then add the peak again. A steel roof is not itself stored grain.
The hopper model is a circular conical frustum with an entered outlet diameter. A full hopper adds its complete volume below the cylindrical body; partial-hopper mode measures the vertical grain height above the outlet and adds no grain above the hopper. Rectangular mode assumes a level, uniform-depth grain bed; peaked or irregular warehouse piles are not modeled.
Test-weight presets are illustrative nominal mass-per-bushel values, not a grain grade or a measured density. Moisture, grain condition, foreign material and consolidation affect inventory. An optional density adjustment affects estimated mass only and should not duplicate packing already represented in the measured bulk density.
The full-profile reference uses wall height plus the configured peak allowance and, when applicable, the full hopper. It is not a manufacturer rating, usable-volume guarantee, roof-load limit or warehouse certification. No structural, aeration or moisture-shrink model is included.
Truck estimates use your payload and, optionally, usable grain volume. Axle limits, tare, road rules, product density and loading practice may require more trips. Use verified scales and applicable trade standards for settlement.
Frequently asked questions
What is the difference between grain peak and roof height?
Peak height is the grain cone above its depth at the wall. The metal roof is part of the structure and must not automatically be counted as filled grain.
Does test weight change the bin volume?
No. Dimensions determine geometric volume and U.S. dry-volume bushels. Test weight estimates the mass in that volume. Commodity trading bushels may instead be expressed using a standard mass.
Can I measure without entering the bin?
Use safe external measurement methods, bin records or appropriate remote equipment. Never enter stored grain to obtain a reading. Do not walk on bridged grain or approach moving equipment.
How accurate is this estimate?
Accuracy depends on measurements, grain shape, actual density and packing. This planning estimate does not replace verified inventory measurements or certified weighing.
What if my bin has a different roof or wall style?
Use internal dimensions. The tool supports a straight round cylinder with a centered grain cone, a circular hopper frustum or a uniform rectangular grain bed. Irregular or unsupported shapes need another measurement method.
Use outside measurements whenever possible. Never enter stored grain to take readings.
Sources & Reference Guides
U.S. Department of AgricultureTest weight and representative grain sampling.
Food and Agriculture OrganizationPost-harvest grain storage and bulk stores.
Iowa State University ExtensionStorage geometry and grain-volume methods.Independent references, not institutional endorsement or certification.
Measure your storage. Understand every bushel.