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Grain Bin Capacity Calculator — Bushels by Diameter, Height & Commodity

Calculate level fill, peaked fill, and partial fill volumes for flat-bottom and hopper-bottom bins

Enter your bin diameter, eave height, roof pitch, and commodity to calculate total bushel capacity with peaked and level fill volumes. Supports flat-bottom and hopper-bottom bins with accurate cone geometry. Includes weight estimates by commodity and partial fill calculations for inventory checks.

Pro Tip: Peaked fill adds 15–25% capacity over level fill on most bins — but only if your spreader distributes grain evenly. Uneven peaks can create dangerous sidewall pressure.

Know your bin capacity? Calculate the cost of drying that grain.

Grain Drying Cost Estimator →

Need to size the auger to fill this bin?

Auger & Conveyor Sizing Calculator →
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Grain Bin Capacity Calculator
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How It Works

  1. 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.

  2. Select Commodity

    Choose corn, soybeans, wheat, oats, barley, sorghum, sunflowers, or rice. Each has a standard test weight and angle of repose that affects peaked fill volume.

  3. Review Capacity Results

    See level fill bushels, peaked fill bushels, weight in tons, and use the partial fill slider to estimate current inventory at any grain depth.

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

Frequently Asked Questions

The calculator uses standard geometric formulas (cylinder + cone) with USDA standard test weights. Results typically match manufacturer rated capacity within 2-3%. Differences arise from wall corrugation thickness, floor slope, and actual vs. nominal dimensions.
Yes. The cone of grain above the eave can add 15-25% depending on bin diameter, roof clearance, and the commodity's angle of repose. Corn (25° angle of repose) peaks less than soybeans (29°). But peaked fill only counts if your bin has adequate roof clearance and a grain spreader for even distribution.
USDA standard test weights: corn at 56 lb/bu, soybeans at 60 lb/bu, wheat at 60 lb/bu, oats at 32 lb/bu, barley at 48 lb/bu, sorghum at 56 lb/bu. Actual test weights vary by year and region.
Disclaimer: Capacity estimates use standard geometric formulas and USDA test weights. Actual capacity varies with bin construction, grain condition, and fill method. Do not use for structural loading calculations.

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