AUTHOR'S NOTE I was unhappy with the unfinished Math::Calc::Units; but I was happy with Math::Units. I felt that there should be a perl module that handles units in a human readable way. -Paul SYNOPSIS use Math::Units::PhysicalValue qw(PV); my $exit = PV "10,000 ft"; my $open = "3500 ft"; my $delay = "43 s"; my $dist = $exit - $open; my $rate = $dist / $delay; my $weight = "180 lbs"; my $momentum = ($weight * ( ($exit - $open) / $delay )) + "0 kg*m/s"; print "$momentum\n"; # prints 3,761.82 kg*m/s print ($rate + "0 miles/hour"), "\n" # prints 103.07 miles/hour