Not all skeins have metreage labelled but of those that do, there is variance:

“50g = 60 metres”
or
“1 3/4 oz / 50g = 82 yards / 75 metres”

“Machine wash - Luke warm - Gentle cycle - Dry Flat”
“15sts. = 10cm (4”) on 6mm (US 10) needles”