Work out silo volume instantly with clear inputs, formula shown and shareable results.
A silo is a cylinder over a cone. The cylinder holds pi x r^2 x height and the cone one third of that per unit height, so total volume is pi x r^2 x (cylinder height + cone height / 3). Multiplying by bulk density gives the tonnage held.
Silo volume
Volume = pi x r^2 x cylinder height + pi x r^2 x cone height / 3
Capacity
Capacity (t) = volume x bulk density / 1000
Yes if filling from a central spout — the heaped cone above the eaves adds volume, while for level filling you should discount the top 0.3-0.5 m as freeboard.
It is the discharge hopper and its wall angle must exceed the material's angle of friction or the silo will bridge and not flow. Volume-wise it adds a third of an equivalent cylinder.