How to Calculate Curtain Weight?

(Flat measurement of curtains x drop of curtains) * square metre weight of fabric. Example Regency flame retardant velvet curtains, fabric weight 363gm per square metre, plus lining 200gms per square metre. Thus circa 563 grams per square. Metre. 
flat curtain measurement 1000cm, drop of 300cm. Thus 30 sqm of fabric. Total weight is 30sqm x 0.563kg = 16.89kg.

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