Enter a value (x) into the calculator below to calculate the value of e^-x. e is also known as Euler’s number which is equal to approximately 2.71828.

## e^-x Formula

The following formula is used by the calculator above to determine the value of e^-x.

Since e is a known value, also known as Euler’s number, which is approximately 2.71828, this calculator can simply take that number and raise it to the negative value of X.