1000 g 1 m² 1 yd²
1 kg × ------ × ------- × --------- = ~5.564 yd²
1 kg 215 g ~0.836 m²
shill wrote:I'll assume that "GSM" stands for grams per square metre (g/m²). This is a simple case of unit analysis.
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1000 g 1 m² 1 yd²
1 kg × ------ × ------- × --------- = ~5.564 yd²
1 kg 215 g ~0.836 m²
Therefore, your fabric has an area of approximately 5.564 square yards.