Verified Mathematical Model & Formulation
Body Consumption (kg/dz) = [(Length + Allow) × (1/2 Chest + Allow) × 2 × GSM] / 10,000,000 × 12 Sleeve Consumption (kg/dz) = [(Sleeve L + Allow) × (Armhole + Allow) × 2 × GSM] / 10,000,000 × 12 Total Fabric = (Body + Sleeve + Neck Rib) × (1 + Wastage %)
The global Ready-Made Garment (RMG) standard formula converts 2D pattern measurements (in cm) and fabric weight (in grams per square meter, GSM) into kilograms of finished knitted fabric required per dozen garments.
Configurable Parameters & Standard Units
- Body Length (cm): (Default: 72 cm)
- 1/2 Chest Width (cm): (Default: 54 cm)
- Sleeve Length (cm): (Default: 24 cm)
- Fabric Weight (GSM): (Default: 180 count)
- Cutting & Process Wastage (%): (Default: 10 percent)
- Total Order Quantity (Dozens): (Default: 100 count)
Standard Worked Example & Practical Verification
Scenario: Calculating fabric order for a 180 GSM single jersey T-shirt with 72 cm length, 54 cm 1/2 chest, 24 cm sleeve, and 10% wastage.
Practical Takeaway: For an order of 1,000 dozen (12,000 pieces), book 2,660 kg of single jersey fabric.
Frequently Asked Questions
What does GSM mean in garments?
GSM stands for Grams per Square Meter. It is the primary measurement of fabric thickness and weight (e.g. lightweight summer T-shirts are 140-160 GSM, medium weight 180-200 GSM, heavy hoodies 300-380 GSM).
Why is 10,000,000 used as the divisor in the knit formula?
Length (cm) × Width (cm) = cm². To convert cm² to m² requires dividing by 10,000. To convert grams to kilograms requires dividing by 1,000. 10,000 × 1,000 = 10,000,000.