Calculate a grain-storage conversion ratio that compares usable grain recovered after storage with the grain mass placed into storage. For this page, 'feed conversion' is treated as storage input per unit of usable output, a practical way to express shrink and handling loss when stored grain is destined for feed. Enter the grain loaded, grain recovered, and any additional rejected or unusable quantity. The calculator reports input-to-usable-output ratio, recovery percentage, and total loss. A ratio close to 1.00 means most stored grain remained usable; a larger ratio means more input was required for each pound of usable grain. This is a mass-accounting tool rather than an animal feed-efficiency measure.
1. Enter stored input
Use the weighed grain mass placed into the storage system.
2. Enter recovered grain
Use the total grain removed from storage at the end of the period.
3. Enter rejected quantity
Subtract grain that is recovered but not usable for the intended feed purpose.
4. Review the ratio
A result of 1.04 means 1.04 lb of stored input was needed for each 1.00 lb of usable output.
5. Compare periods carefully
Use comparable measurement and moisture bases when comparing storage lots.
All masses should use the same unit and, ideally, a comparable moisture basis.
The main result shows how many pounds of stored grain input correspond to one pound of usable grain output after storage and rejection losses.
Changes in grain moisture can create apparent shrink or gain. For rigorous comparisons, adjust weights to a common moisture or dry-matter basis.
Given: 80,000 lb stored, 77,200 lb recovered, and 500 lb rejected.
Calculation: Usable output = 77,200 − 500 = 76,700 lb. Ratio = 80,000 ÷ 76,700 = 1.0430. Recovery = 76,700 ÷ 80,000 × 100 = 95.88%. Mass loss = 3,300 lb.
Result: Storage conversion ratio = 1.043 lb input per lb usable output.
The ratio summarizes storage recovery; it should not be interpreted as livestock feed conversion.
No. Here the ratio describes stored grain input versus usable grain output after storage. Animal feed conversion compares feed intake with animal gain or production.
Recovered grain may include spoiled, contaminated, or otherwise unusable material. Subtracting it gives the mass that is actually available for the intended use.
Yes. Grain can lose or gain water during storage, changing scale weight without the same change in dry matter. For technical comparisons, normalize weights to a common moisture basis.
The ratio cannot be calculated because division by zero would occur. The calculator flags that condition instead of displaying an infinite value.
Use it to compare storage periods, structures, or handling practices when measurements are collected consistently. It is most meaningful alongside moisture and quality records.