How to measure a climbing sling
A climbing sling is measured end to end when pulled tight (usable length) and NOT by the circumference. This makes the length of the sling approximately half of the circumference.
To measure a sewn climbing sling, follow these steps:
Lay the sling out flat on a surface and pull tight, ensuring it is not twisted, kinked, or knotted.
Use a measuring tape or ruler to measure the length of the sling from end to end. Measure from the tip of one end to the tip of the other end.
Note that slings typically shrink slightly over time. If you’re trying to replace an existing sling it will probably be between 5% and 10% shorter compared to when it was new. This typically holds true for Dyneema slings as well as the coloured portion of the Dyneema sling is usually made with Nylon.
It is also important to inspect the sling regularly for any signs of wear, damage, or other issues that could compromise its strength and safety.