To provide a dry weight estimation program capable of easily estimating dry weight of algae.SOLUTION: The dry weight estimation program is configured so as to, when a compaction image of an algae culture liquid is acquired, cause a computer to execute a series of processing to determine the image capacity of the compaction image. The dry weight estimation program is configured to cause the computer to execute a series of processing to refer to a storage part storing a relationship between the image capacity and the dry weight and to output an estimation value of the algae dry weight included in the compaction image on the basis of the determined image capacity.SELECTED DRAWING: Figure 6
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