To ascertain by computation; compute; reckon up arithmetically or by items: as, to calculate interest, or the cost of a house.To make an estimate of; compute by weighing related facts or circumstances in the mind: as, to calculate chances or probabilities.To fit or prepare by the adaptation of means to the end; make suitable; plan: generally in the perfect participle, and frequently (though improperly) in the sense of fitted, without any thought of intentional adaptation.To purpose; intend; design: as, he calculates to do it; he calculates to go.To think; guess.To make a computation; arrive at a conclusion after weighing all the circumstances; form an estimate; reckon: as, we calculate better for ourselves than for others; to calculate on (that is, with expectation of) fine weather.To speculate about future events; predict.To suppose or believe, after deliberation; think; ‘guess’; ‘reckon’: as, you are wrong there, I calculate.n. Calculation.