Grain Bin Capacity Calculator
Estimate your storage space. Enter your bin dimensions to calculate the total capacity in bushels, including the additional volume in the peaked roof.
1.0 = No pack, 1.05 = 5% pack
How do I calculate the volume of a grain bin?
A standard grain bin is a cylinder with a cone-shaped roof. Calculate the volume of the cylinder (π × r² × h) and the volume of the cone ((1/3) × π × r² × h_cone), then add them together.
How many cubic feet are in a bushel?
One standard (Winchester) bushel is approximately 1.244 cubic feet. To find the number of bushels, divide the total cubic feet by 1.244.
What is "Pack Factor"?
The weight of the grain itself compresses the grain at the bottom of the bin, allowing more to fit. This increase is called the pack factor, typically ranging from 1.03 to 1.05 (3-5% increase).
Does the grain type affect the capacity?
While the volume of the bin remains the same, different grains have different test weights. Most capacity calculations are based on standard bushels, but moisture content can also affect how much grain fits.