计算 (jì suàn) means 'to calculate' or 'computation' and functions as both a verb and a noun. The first character 计 (jì) means 'to plan, to consider, or to reckon', while the second character 算 (suàn) means 'to compute, to figure, or to count'. Together, they form a compound that emphasizes the mental or mechanical process of determining a numerical result — whether done by hand, calculator, or computer. It is widely used in academic, technical, financial, and everyday contexts involving numbers, measurements, or logical reasoning.

This word appears frequently in mathematics, science, engineering, and daily life — for example, when estimating costs, solving equations, analyzing data, or programming algorithms. As a noun, it often appears in compounds like 计算机 (jì suàn jī, 'computer') or 计算能力 (jì suàn néng lì, 'computational ability'). Unlike more casual terms like 算 (suàn) alone, 计算 carries a formal, precise connotation and is rarely used in idiomatic or figurative expressions.