Grain Storage Calculator

Cylinder volume scales with radius squared but only linearly with depth, so a given percentage increase in Bin Diameter adds proportionally more cubic footage than the same percentage increase in Grain Depth (sidewall). A 10% wider bin roughly compounds to about a 21% larger cross-section before depth even enters the calculation, which is why diameter is the input this calculator's capacity responds to most.

No -- Bin Capacity in bushels is purely geometric, based on Bin Diameter, Grain Depth (sidewall), and Peak Angle. Grain Type only determines the test weight (pounds per bushel) used to convert that same bushel figure into Total Weight in tons and pounds, since corn, wheat, soybeans, and oats pack to different densities per bushel even in an identically sized bin.

It adds a cone of grain piled above the sidewall fill line, the shape grain naturally settles into at its angle of repose when a bin is filled past level rather than leveled off. Raising Peak Angle raises the cone's height and therefore its volume, on top of the cylinder volume already counted from Grain Depth (sidewall) -- set it to 0 if the grain surface is struck level instead of peaked.

No, it's exact: NIST Handbook 44's official table of units of measurement defines a U.S. bushel as 2,150.42 cubic inches, which converts to 1.244456 cubic feet (1.2445 here) with no rounding shortcuts taken in that conversion. Any imprecision in the final bushel count instead comes from the geometric assumptions -- uniform grain depth, a clean conical peak, no settling -- not from this unit conversion.