Aside: There is a difference in how much it should be (for basic essentials, as is supposed to be the reason for it) vs what we want it to be (so we don't have to work for anything and can enjoy our own time). We're not far enough along in the process to be able to do option number two, but option number one should have been implemented years and years ago. It will take time, (and probably severe threat to the rich's wallets) to fully implement a system of UBI that takes away the need for work for compensation globally or even nationally.
RE: Basic income is about efficiently eradicating poverty. So if Bernie Sanders is right then minimum wage should be about $15 USD per hour, or about $30,000 per year. A lot of basic income advocates state basic income should be about $12,000 per year.