I'm comparing the shear formula for a beam in english and metric. But it seems the formula or result don't match. In English, the formula is Vc=2*b*d*sqrt(Fc) Given b=11.81102 inches d=18.11024 inches fc=4000 psi Vc=2*b*d*sqrt(Fc)=27056 lbs Now converting the units in metric. b=300mm (11.81102 inches) d=460mm (18.11024 inches) fc=27.5 Mpa (4000 psi) Vc=2*b*d*sqrt(Fc)=45.8 Kilonewton To convert Kn to lbs. Divide Kn by 4.448 and multiply by 1000. Doing that to the metric result. 45.8 Kn / 4.448 x 1000 = 10304 lbs But 10304 lbs is not equal to the result in the english formula? Why? Note this is not a homework. I just want to compare the two units in the formula. Thanks.