What is the standard re raise size pre flop?

I see in cash games like hsp it can vary from double to 5 x the original raise whilst in the wsop main event I find it's usually double.....

ha, that is a good question

i tend to shoot for a round number for the total bet

so let's say im blind with 50, i get raised 150 for 200 total, id probably come back over for 300 raise 500 (total), but im interested to hear feedback on this