Also means
to estimate
Usage Note
Calcular means both to calculate precisely (calcular el área) and to estimate or reckon informally (calculo que tardará una hora, 'I reckon it'll take an hour'). The noun is cálculo (calculation; also calculus in maths), and calculadora is the word for a calculator.
Examples
"Necesito calcular el coste total del viaje."
Natural Translation
I need to calculate the total cost of the trip.

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