How thick would a rope need to be for partial hanging?

[nullatu]

I am about 60 - 70kg and I am going to tie one end of the rope around my bedpost. My parents are going to be out of the house all day on Sunday, so that is the perfect time. There is one problem with my plans so far, I do not know what rope to use nor how thick it should be. To be on the safe side I want to use some braided rope instead of a scarf or fabric, so that way there is a lesser chance of breaking or slipping. I have found a few choices of rope but am still not sure if they are right. Here they are:

https://www.bunnings.com.au/grunt-10mm-x-10m-sisal-twisted-rope_p4310291

https://www.bunnings.com.au/syneco-4mm-x-50m-white-polypropylene-rope_p4312306

https://www.bunnings.com.au/syneco-9mm-x-30m-diamond-braided-polypropylene-rope_p4310091

I know that they are all quite the same, but I want to make sure I am going to get the right type to do the job. I am on low budget so I can not afford much. Thanks.

 

[therhydler]

I am absolutely no expert on ropes but from what I've read 9 or 10mm should work fine for your weight, even 8mm is ok. But I think 4mm is too thin (if the rope is too thin it will cut into your neck more which will be painful). The first rope looks a bit stiff - this will also make it more painful and less effective I think. The third rope looks good to me, but I would need someone to confirm this, I'm not 100% sure. I'm also looking for a good rope :/