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In mathematics, **value** may refer to several, strongly related notions.

In general, a mathematical **value** may be any definite mathematical object. In elementary mathematics, this is most often a number – for example, a real number such as π or an integer such as 42.

- The
**value**of a variable or a constant is any number or other mathematical object assigned to it. Physical quantities have numerical values attached to units of measurement. - The
**value**of a mathematical expression is the object assigned to this expression when the variables and constants in it are assigned values. - The
**value**of a function, given the value(s) assigned to its argument(s), is the quantity assumed by the function for these argument values.^{[1]}^{[2]}

For example, if the function f is defined by f(x) = 2x^{2} – 3x + 1, then assigning the value 3 to its argument x yields the function value 10, since f(3) = 2·3^{2} – 3·3 + 1 = 10.

If the variable, expression or function only assumes real values, it is called **real-valued**. Likewise, a **complex-valued** variable, expression or function only assumes complex values.