mindmap root((计算)) calculate is usually preferred in reference to highly intricate and precise processes that produce a result not readily proven by physical confirmation: ~d when the comet would next appear. compute is the term for reaching an exact result by simpler though often lengthy arithmatic processes: ~d the interest at a quarterly rate. estimate applies chiefly to the forecasting of costs or trends and suggests a seeking of usable but tentative and approximate results: the mechanic ~d the cost of repairs. reckon usually suggests the simpler arithmatic processes or the use of methods such as can be carried in one's head: ~ed the number of yards of fabric needed.