Application for calculating frame rate?

Is there any application from where I can calculate how many frames per second I am getting?

you mean in a video game? for that try FRAPS...

some 3D Accelerator Graphics Cards Driver/Software gives the capability to show some information as a layer upon the game screen while playing.

and if you are about streaming videos then try to play the stream with any player that supports streaming and show such information. I think VLC gives such details while streaming.

I am not so sure about it.

try "Fraps"