Grain Bin Calculator
Enter a round bin's diameter and the depth of grain inside to estimate the volume and the number of bushels of space it fills. This measures geometric volume only, not the weight of any grain.
Last updated: September 25, 2026
Frequently asked questions
How do I calculate the volume of a grain bin?
For a round bin, multiply the area of the circle (pi x radius squared) by the depth of the grain. This tool then converts the result into cubic feet, cubic meters, and bushels.
Does this tell me how many pounds of grain the bin holds?
No. Grain weight depends on the crop, its test weight, moisture, and packing, so this tool reports volume-based bushels only.
Why does my bin's rated capacity differ?
Rated capacity may account for a peaked top, a cone or hopper bottom, and headspace, while this tool assumes a plain cylinder filled to a flat surface.
What is a bushel in this calculator?
A US volumetric bushel of about 1.2445668 cubic feet (2,150.42 cubic inches). It is a measure of space.
How is this different from the Cylinder Volume Calculator?
The Cylinder Volume Calculator gives geometric volume from radius and height. This one is set up for bins and converts the result to bushels directly.
Can I use metric dimensions?
Yes. Choose meters and the tool converts to feet for the bushel calculation.