🌽 Grain Bin Calculator
Enter your grain bin’s diameter and the grain fill depth to calculate its storage capacity in bushels.
What this calculator does
The Grain Bin Calculator estimates how many bushels of grain a cylindrical storage bin can hold, based on its diameter and the depth of grain inside it, with an optional peaked cone on top for a fully filled bin.
How the formula works
The calculator finds the volume of the cylindrical section using V = π × r² × height, adds the volume of any cone-shaped peak using V = ⅓ × π × r² × cone height, and converts the combined cubic footage to bushels using the standard conversion of 1 bushel = 1.2445 cubic feet.
- Leave Roof Cone Height at 0 for a flat-filled or partially filled bin
- Bin diameter has the biggest effect on capacity since volume scales with the radius squared
A note on accuracy
Actual usable capacity can be affected by grain settling, moisture content, and bin structural fill limits, so use this as a planning estimate alongside your bin manufacturer’s rated capacity.