1.
calculator; calculating machine
A device used for mathematical calculations. In modern everyday usage, typically refers to a handheld electronic calculator.
2.
computer (technical/dated)
In academic and technical contexts, especially in computer science, 計算機 can refer to a computer. This usage is more common in formal or academic writing.
Related Words
Synonym:
電卓 (calculator (common))
Related:
コンピューター (computer)
Compare:
パソコン (computer)