To determine how many bushels a round bin can hold, multiply the diameter by the diameter by the depth. This results in the round bin's volume, which you can then multiply by 0.80385 to get the number of standard bushels. To get the peak in the round bin, multiply the diameter by the diameter by 0.7854 by 0.80385, which results in the number of bushels per foot.
To measure the standard bushels in the peak's height above the base, divide the peak height by 3, and then multiply it by the number of bushels per foot in the bin.
If the height above the peak is indeterminable, divide the diameter by 2, and then multiply it by 0.4 for corn or by 0.5 for soybeans. Divide the resulting number by 3, and then multiply it by the number of bushels per foot to get the standard bushels measurement.
If the round bin has a cone down below its center, apply the same calculation as to the peak of the bin. Find the cone's depth, or use the mentioned rule of thumb, multiplying the number by two-thirds to get the bushels per foot. Another calculation is to take the side wall's depth and add one-third of the cone's height or subtract one-third of the cone's depth down.