Grain Bin Volume Calculator

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.

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.

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.

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.

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.

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.

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.

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.