Standard operators

%

Percentage from a previous value: 1000-30% = 700

^

Powering: 2^3 = 8

*

Multiplication: 2*3 = 6

/

Division: 2/3 = 0.6666...

+

Addition: 2+3 = 5
Unary plus: +2

-

Subtraction: 2-3 = -1
Unary minus: -2

#

Operator for changing the base (radix) to 16 (hex): #ff = 255

&

Operator for changing the base (radix) to 2 (bin): -&110 = -6

Of course you can use parentheses ( and ). Look at operators priority as well.

Built-in variables

You can use following variables, just type its name into the edit window.

e

The base of the natural logarithm.
e = 2.718...

pi

The ratio of a circle's circumference to its diameter.
pi=3.141...