Agricultural Field Calculators
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Grain Bin Storage Capacity Calculator

Calculate storage capacity in bushels for round bins, hopper-bottom bins, and flat-bottom steel bins. Enter bin diameter and eave height and select your grain type — supports corn, wheat, soybeans, canola, and custom test weights.

Grain Storage Calculator

Calculate how many bushels or tonnes a bin, silo, or flat storage can hold.

Fill in the fields and press Calculate to see your results.

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Disclaimer — Storage capacity calculations are estimates based on standard grain bulk density values. Actual capacity varies with grain condition, moisture content, and bin construction. Do not overfill storage structures beyond rated capacity.

Frequently Asked Questions

Volume (cu ft) = π × radius² × eave height + (π × radius² × peak height ÷ 3) for peaked fill. Bushels = total cu ft × (bulk density ÷ lbs per bushel). For corn: divide cu ft by 1.244.
A 48-ft bin with 24-ft eave height holds approximately 62,000–68,000 bushels of corn depending on peak height. Adding a 7-foot peak adds approximately 6,500 bushels.
Corn: 56 lbs/bu. Soybeans: 60 lbs/bu. Hard and soft wheat: 60 lbs/bu. Barley: 48 lbs/bu. Oats: 32 lbs/bu. Canola: 50 lbs/bu. Dry edible beans: 60 lbs/bu. Lentils: 60 lbs/bu.
Hopper-bottom bins use gravity for complete unloading without a sweep auger — preferred for high-value crops. Flat-bottom bins require a sweep auger but offer lower cost per bushel and greater capacity per footprint.
Safe storage moisture: corn ≤14.0% for 6+ months, soybeans ≤12.0%, hard wheat ≤13.0%, soft wheat ≤13.5%, canola ≤8.0%, dry beans ≤14.0%. Higher moisture grain requires aeration or drying first.
On-farm storage saves $0.08–0.25/bu/month in commercial elevator fees and allows basis-capture marketing. Payback on a well-utilized grain bin investment is typically 3–6 years depending on local basis patterns.

Round bin capacity (bu) = (π ÷ 4) × diameter² × grain depth × 0.8036 (for corn at 56 lbs/bu). A 42-foot diameter bin with 28 feet of grain depth holds about π/4 × 42² × 28 × 0.8036 ≈ 38,900 bushels of corn. Different grains have different bushel weights, so a 60-lb wheat bushel takes less space than a 56-lb corn bushel.

1 bushel = 1.2445 cubic feet. Divide cubic feet by 1.2445 to get bushels. A 50,000 cubic foot bin holds 50,000 ÷ 1.2445 ≈ 40,177 bushels of any grain. Actual capacity varies slightly by grain weight — the calculator adjusts for corn, soybeans, wheat, canola, and other commodities.