In 1 pound-force [lbf] there is 0.0005 ton-force [tnf].

atomic unit of force [au] dyne [dyn] [CGS] gram-force [gf] grave-force [gf] gravet-force [gf] kilonewton kip [kip] kip-force [kipf] millinewton newton [N] ounce-force [ozf] pond poundal [pdl] pound-force [lbf] sthene [sn] ton-force [tnf]

atomic unit of force [au] dyne [dyn] [CGS] gram-force [gf] grave-force [gf] gravet-force [gf] kilonewton kip [kip] kip-force [kipf] millinewton newton [N] ounce-force [ozf] pond poundal [pdl] pound-force [lbf] sthene [sn] ton-force [tnf]