Did it never occur to you that Celsius is basically Kelvin with the zero point moved to human reference?
Human reference because >50% of our body is water. We are essentially water bags.
Yeah, I know. It still moves the zero point and forces it out of ratio, but I prefer it. I know both F and C since I have to use both regularly. F is set to C, too, I think. F = 1.8c + 36, I think?
No, it just moves the zero point, no ratio change: 0°C = 273,15 K / just a simple addition/subtraction.
Colloquially you can also ignore the 0,15 and make it even simpler.