Originally Posted by Pack Mule
Is this 5/8" or 3/4" anchor line .
I agree with taking it to a chandlery. Or, locate a shop that makes and sells rigging gear (sail boat and/or crane lifting slings). Rigging shops typically sell lots of rope of all varieties. With so many new fibers being introduced it could be very hard to get anything conclusive from weight per foot and who knows the accuracy of your scale... Just my opinion... When you go to a rigging shop only talk with the shop foreman or shop manager. Sales people in these shops simply cannot be relied on as they typically have no real world experience. I ran a large shop for a few years, my sales people always wanted to believe that knowledge was anointed with a job title. My motto then as now... "sneak up softly and whack em with a big stick."
Plus, rope is manufactured to a spec that has 'oversize when new' tolerance.