Input Measurements
Live Auto-Calculation
Output Summary
Verified Spec
Calculating...
Initial output value
Metric Fabric GSM
240.0 g/m²
Imperial Weight
7.08 oz/yd²
Apparel Weight Classification
Medium-Heavy (Tees, Hoodies)
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How to Use the Fabric GSM Calculator (Grams per Square Meter)
- Select your desired options and garment / fabric specifications from the input fields above.
- Enter your measurements with high precision using the labeled unit selectors (inches, centimeters, or grams).
- Review the live calculation summary in the prominent result card to confirm fabric yardage, cuts, or conversions.
- Use the "Copy Specification" button to save your cutting specification to your tech pack or pattern notes.
Documented Textile Industry Formula
Fabric GSM & Weight Formulas
- 1. Area in square meters = (Length in cm × Width in cm) / 10,000
- 2. GSM (g/m²) = Weight in grams / Area in m²
- 3. Imperial Weight (oz/yd²) = GSM / 33.906
- 4. For 100 cm² round cutter sample: GSM = Swatch Weight (g) × 100
Worked Calculation Example
Real-World Scenario: A 20 cm × 20 cm rectangular fabric swatch weighing 9.6 grams.
- • Swatch Area = (20 cm × 20 cm) / 10,000 = 0.04 m²
- • GSM = 9.6 grams / 0.04 m² = 240.0 g/m²
- • Imperial Weight = 240 / 33.906 = 7.08 oz/yd²
The fabric is 240 GSM (Medium-Heavyweight Cotton Jersey, ideal for premium heavyweight t-shirts or light hoodies).
Frequently Asked Questions
What does GSM mean in fabric?
GSM stands for 'Grams per Square Meter'. It is the global metric benchmark used to measure fabric density and weight regardless of how wide the bolt is.
How do you convert GSM to oz/yd²?
Divide GSM by 33.906 (or multiply by 0.02949) to get ounces per square yard (oz/yd²). For example, 240 GSM / 33.906 = 7.08 oz/yd².
What is considered a good GSM for clothing?
Lightweight fabrics (t-shirts, blouses) range from 120 to 180 GSM. Medium-weight fabrics (chinos, dress shirts) range from 180 to 260 GSM. Heavyweight fabrics (streetwear hoodies, denim, canvas) range from 300 to 500+ GSM.