Frame rate counter

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WoeIsMe

I've done a bit of code to show the frame rate of my game, but it seems to change the number a lot. Is this normal/to do with my game, or is there a better way of designing a frame rate counter?

here's the code

If debug=1 Then 
nowmillisecs#=MilliSecs()-lastmillisecs#
	Color 150,150,0
	Rect 600,500,150,50
	SetFont ammostatfont
	Color 255,255,255	
	Text 610,510,nowmillisecs+"ms/f"
	Text 610,530,1/(nowmillisecs#/1000)+" FPS"
EndIf

lastmillisecs#=MilliSecs()

It shows the frame rate in milliseconds per frame (ms/f) and frames per second (fps)