I've found a calculator on the BBC which lets you work out where you are on the global fat scale.
Here are my results:
My obesity index is 26 BMI.
I'm below UK national average for BMI: I have a lower BMI than 63% of males aged 30-44 in UK.
I'm above global average for BMI: I have a higher BMI than 69% of males aged 30-44 in the world.
If everyone in the world had the same BMI as me, it would add 31,265,261 tonnes to the total weight of the world's population!
I'm most like someone from Columbia! (Compared with other males aged 30-44 in Columbia).
I can see the progress I've made over recent years as I remember having a go at this calculator a couple of years ago when I was obese (rather than 'merely' overweight as now) and being most like someone from Tonga, which is the second highest category! Back in Autumn 2014 I was most like someone from Croatia, which is the third highest. (Not sure why people in Croatia would be among the heaviest???)
Here is the calculator