Hello,

Im trying to figure out a metric formula for Pi(r)²(3psi) without having to do any conversions. I will be using mm instead of in, and kg instead of lbs. Is this possible?

Everything I have tried does not equal the same amount as when I do the whole problem in non-metric, then convert the lbs result to kg. I looked at other places online, but that started getting me into kPa which I have no idea about.

Thanks in advance for you help!