Grain Bin Volume Calculator

A grain bin holds thousands of bushels, but knowing exactly how much requires accounting for bin shape, grain depth, and crop type — that's what the Grain Bin Volume Calculator does. Select your bin type (round or square), enter your bin diameter, bin height, average grain height, and grain type, then configure your roof type to get your total storage capacity in bushels. Secondary outputs include grain volume, total bin volume, grain weight per bushel, and total grain weight in pounds.

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Height of grain inside the bin

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Additional height for peaked roofs

Results

Total Storage Capacity

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Grain Volume

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Total Bin Volume

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Grain Weight

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Total Grain Weight

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Frequently Asked Questions

How do I measure the diameter of a round grain bin?

Measure the diameter of a round grain bin from one side to the other at the widest point. For accuracy, measure across the center of the bin at ground level.

What is the standard weight per bushel for different grains?

Common grain weights per bushel are: Corn (56 lbs), Soybeans (60 lbs), Wheat (60 lbs), Barley (48 lbs), Oats (32 lbs), and Rice (45 lbs). These are standard test weights used in agriculture.

How does grain height differ from bin height?

Grain height is the actual depth of grain stored in the bin, while bin height is the total height of the bin structure. Grain height is typically less than bin height to allow for headspace and loading clearance.

Do I need to account for the roof when calculating storage capacity?

The roof type affects total bin volume but not grain storage capacity, as grain is stored below the roof level. However, peaked roofs can provide additional headspace for loading and aeration equipment.

What factors affect actual grain storage capacity?

Actual storage capacity can vary based on grain moisture content, compaction, bin cone bottom design, and internal equipment like stirring systems or temperature cables that take up space.

How accurate are grain bin volume calculations?

These calculations provide close estimates based on standard formulas and grain densities. Actual capacity may vary by 2-5% due to grain settling, moisture content, and bin construction variations.

Can I use this calculator for other storage structures?

This calculator is designed for cylindrical and square grain bins. For other structures like quonsets, bunkers, or piles, different calculation methods and formulas are required.

What is the difference between round and square bin calculations?

Round bins use circular area calculations (π × radius²), while square bins use rectangular area calculations (length × width). Round bins typically provide more storage volume per unit of wall material.