{\displaystyle {\begin{aligned}1\,{\text{lbf}}&=1\,{\text{lbm}}\times g_{\text{n}}\\&=1\,{\text{lbm}}\times 9.80665\,{\tfrac {\text{m}}{{\text{s}}^{2}}}/0.3048\,{\tfrac {\text{m}}{\text{ft}}}\\&\approx 1\,{\text{lbm}}\times 32.174049\,\mathrm {\tfrac {ft}{s^{2}}} \\&=32.174049\,\mathrm {\tfrac {ft{\cdot }lbm}{s^{2}}} \\1\,{\text{lbf}}&=1\,{\text{lbm}}\times 0.45359237\,{\tfrac {\text{kg}}{\text{lbm}}}\times g_{\text{n}}\\&=0.45359237\,{\text{kg}}\times 9.80665\,{\tfrac {\text{m}}{{\text{s}}^{2}}}\\&=4.4482216152605\,{\text{N}}\end{aligned}}}