I'm trying to convert lb/f to kn/m. A concrete has weight of 23.54 kilonewton/cubic meter which is equal to 150 pounds per cubic feet. For a beam with the following dimensions width = 0.3m = 0.84 feet depth = 0.5m = 1.9685 feet for the beam weight per meter in metric, it is 23.54*0.3*0.5=3.531 kn/m for the beam weight per foot in english, it is 150*0.98*1.96=290.62 lb/foot But if I convert 290.62 lb/foot to kn/m. I don't get 3.531kn/m but 4.240181 kn/m here's the calculation 290.62 lb/f * 3.28 f/m * 1kn/224.8lb = 4.24 kn/m why not 3.531 kn/m?? Note this is not a homework. Thanks.