Refers to a device for performing arithmetic calculations, from simple pocket calculators to more complex desktop models.
Bringing a calculator into the exam is allowed.
He checked the total with a calculator.
Abbreviation of 電子計算機 (electronic computer). Now somewhat dated; コンピューター is the usual modern term. Still seen in older texts or formal/technical contexts.
See also: 電子計算機
Early computers were the size of a whole room.
This computer can process large amounts of data.