Unsigned Java applets, such as all calculators on this site, for not being able to access your computer resources, are generally safer to run than the signed ones.
The security message displyed, if any, is somewhat misleading and you can therefore rest assured that these calculators pose no security risks.
Use this online complex number calculator to calculate expressions containing complex numbers. You can enter complex numbers in the standard form a + bi or in polar form (phasor) r∠(θ) and get the result in all different forms. All algebraic functions, trig, exponential, logarithmic, hyperbolic functions with real or complex arguments are supported.