Grain Bin Capacity Calculator - Round Bin Bushel Estimate
Calculate level fill, peaked fill, and partial fill volumes for flat-bottom and hopper-bottom bins
Enter round-bin diameter, eave height, roof clearance, and commodity planning data to estimate level fill, ideal peaked fill, partial fill, and weight. Outputs are source-boundary planning estimates, not manufacturer rated capacity, certified inventory measurement, grain settlement, crop-insurance adjustment, structural load approval, aeration design, or bin-entry safety guidance.
Know your bin capacity? Screen drying fuel, fan energy, shrink, and buyer-schedule assumptions before you fill up.
Grain Drying Cost Estimator →Size the auger or conveyor to fill this bin at harvest pace without bottlenecking your combine.
Auger & Conveyor Sizing Calculator →See how much grain you actually lose to moisture shrink when drying from field moisture to storage moisture.
Grain Moisture Shrink Calculator →Plan the electrical service for bin fans, dryer motors, and grain handling equipment at this bin site.
Ag Electrical Load Panel Planner →How It Works
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Enter Bin Dimensions
Input diameter (feet), eave height (feet), and select your bin type (flat bottom or hopper bottom). For hopper bins, enter the hopper angle.
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Select Commodity
Choose corn, soybeans, wheat, oats, barley, sorghum, sunflowers, rice, or custom. Treat the row values as editable planning defaults and replace them with measured test weight and validated angle data when available.
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Review Capacity Results
See level fill bushels, ideal peaked fill bushels, weight in tons, and optional partial-fill estimates. Use the warnings to decide what manufacturer, scale-ticket, inventory, insurance, or safety review is still needed.
Built For
- Farmers estimating storage needs before harvest
- Grain elevator operators planning bin assignments
- Insurance adjusters verifying stored grain quantities
- Equipment dealers sizing bins for customers
Assumptions
- Bin dimensions are user-entered planning values; wall corrugation, floor slope, sump volume, and obstructions are not deducted
- Peaked fill assumes an ideal centered cone and may not match off-center fill, core drawdown, crusting, leveling, or aeration practice
- Angle of repose values are local planning defaults and require source/manufacturer/field validation
- Test weights are editable planning defaults; USDA/FGIS grade, settlement, and load-ticket data remain external
- Hopper bottom geometry assumes a true cone with uniform sidewall angle
- Roof clearance limits peak formation above the eave line
- No dockage, foreign material, or broken kernels affecting bulk density
Limitations
- Does not account for compaction from grain depth (tall bins increase bulk density at the bottom)
- Wall corrugation reduces effective diameter by 1-3 inches depending on manufacturer profile
- Peaked fill volume assumes ideal cone geometry that may not form with off-center fill or uneven discharge
- Does not calculate structural loads, sidewall pressure, foundation design, wind load, snow load, or bin-entry safety controls
- Partial fill estimates assume a level grain surface, not the irregular profiles common during unloading
- Not applicable to flat storage buildings, grain bags, or non-cylindrical structures
References
- 7 CFR Part 810 - Official United States Standards for Grain (source pointer for grade and test-weight-per-bushel context)
- USDA AMS Grain Standards public source pointer
- Purdue Extension AED-20 - Managing Dry Grain in Storage (storage context source pointer)
- University of Nebraska-Lincoln CropWatch - How to Estimate Bushels in a Round Grain Bin (round-bin volume source pointer)
- ASABE publications and standards source-gap pointer; exact standard text requires authorized current access
- Manufacturer rated-capacity tables and dealer review for the actual bin model
Frequently Asked Questions
Learn More
What Size Grain Bin Do I Need?
How to calculate grain bin capacity using real geometry, account for peaked vs level fill, factor in moisture shrink, and match your auger to the bin.
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