Product Engineering
The customer specified the GSM. The question is what count delivers it — the calculation run backwards.
— Ne
Count that delivers the target weight at this construction
The solved count will rarely be a commercial one — 29.9 Ne means ordering 30s and accepting the small GSM error, or adjusting pick density to compensate, and the second is usually cheaper. Crimp is an input here but is really an outcome of the construction, so a first pass with assumed crimp should be checked against measured crimp on the sample and re-solved. Warp and weft contributions add back to the target exactly, which confirms the algebra but not the assumptions. Cover factor is reported unadjusted so it can be checked against the weave limit separately.
Target GSM to Yarn Count & Construction Solver — free, with the formula and a worked example, at Textile School.