Warping & Sizing
Beam capacity is a volume problem. Packing density is the number most mills guess at.
— m
Metres of warp the beam will hold when full
Packing density runs about 0.45-0.55 g/cm3 for sized cotton warps and higher for filament. Leave 2-3 cm below the flange so the beam can be handled safely.
Warp Beam Flange Diameter to Length Capacity Tool — free, with the formula and a worked example, at Textile School.