The difference between Calculate and Calculation

Calculate is also verb with the meaning: to determine the value of something or the solution to something by a mathematical process.

Calculation is also noun with the meaning: the act or process of calculating.

check bellow for the other definitions of Calculate and Calculation

Calculate as a verb (transitive, mathematics):

To determine the value of something or the solution to something by a mathematical process.

Examples:

"'Calculate the square root of 3 to 10 decimal places."
Calculate as a verb (intransitive, mathematics):

To determine values or solutions by a mathematical process; reckon.
Calculate as a verb (intransitive, US, dialect):

To plan; to expect; to think.
Calculate as a verb:

To ascertain or predict by mathematical or astrological computations the time, circumstances, or other conditions of; to forecast or compute the character or consequences of.

Examples:

"to calculate or cast one's nativity"
Calculate as a verb:

To adjust for purpose; to adapt by forethought or calculation; to fit or prepare by the adaptation of means to an end.

Examples:

"to calculate a system of laws for the government and protection of a free people"

Calculation as a noun (mathematics, uncountable):

The act or process of calculating.
Calculation as a noun (mathematics, countable):

The result of calculating.
Calculation as a noun (countable):

Reckoning, estimate.

Examples:

"By my calculation, we should be there by midnight."
Calculation as a noun (countable):

An expectation based on circumstances.