Unit conversion error - Darcy Radius of Well Influence Equation | pressku.com

I'm having a small trouble. I'm trying to person nan reply from imperial to metric but can't look to get nan reply to match. I americium utilizing nan look attached (Darcy Radius of Well Influence Equation).

Unfortunately, replicating nan look successful excel has lead maine to an inccorect value. In nan screenshot below, nan apical array is maine converting my measured values to nan original look units, one get a verified answer. This is correct. Below that array is wherever one effort to person nan look into metric units. This has a important correction of 4.5%.

Could personification pass maine arsenic to wherever my portion conversions person gone wrong? Note I person been a spot lazy successful my units - lbm is lb mass, and lbf is lb force.