How to estimate yardage

I have a few skeins of yarn but yardage is not indicated. I think it is worsted weight but do not know how to determine how much I have.

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Measure out a length of yarn(L), and weigh the yarn sample(W). Next, weigh the remaining skein(S).
S/W= X
XL= Length of the skein (approximately)

Or unravel the whole thing and measure it that way. Either way, it’s impractical.

Thanks for the suggestion. Can’t believe the skein wrapper did not have that info. I am researching the manufacturer.