Gram per Square Metre (g/m²)
Grams per square metre (GSM) is the standard measure of fabric weight: the mass of 1 m² of fabric. T-shirt jersey is about 150–180 GSM, denim 340–475 GSM, spunbond nonwovens 10–100 GSM.
Symbol: g/m² (ASCII: g/m2)
Quantity: fabric weight (mass per unit area, GSM)
SI relation: g/m² is the coherent SI unit of fabric weight.
Derivation: Mass in grams of one square metre of fabric (GSM); 1 g/m² = 0.001 kg/m².
Exact: yes, by definition
Typical uses
- Woven, knitted and nonwoven fabric specifications (ISO 3801, ASTM D3776)
- Paper and film grammage
- Fabric GSM from EPI, PPI and yarn counts
Convert grams per square metre to other units
| Conversion | 1 g/m² equals | Reverse |
|---|---|---|
| gram per square metre to ounce per square yard | 0.02949352468 oz/yd² | ounce per square yard to gram per square metre |
| gram per square metre to ounce per square foot | 0.003277058298 oz/ft² | ounce per square foot to gram per square metre |
| gram per square metre to gram per square centimetre | 0.0001 g/cm² | gram per square centimetre to gram per square metre |
| gram per square metre to pound per square yard | 0.001843345293 lb/yd² | pound per square yard to gram per square metre |
Open the Fabric Weight (GSM) Converter to convert any value between all units.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures .
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Gram per Square Metre (g/m²). Retrieved October 25, 2026, from https://scientificconverters.com/units/gram-per-square-meter/
IEEE
Scientific Converters, "Gram per Square Metre (g/m²)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/units/gram-per-square-meter/