Convert Grams per Square Metre to Ounces per Square Foot
1 gram per square metre (g/m²) = 0.003277058298 ounces per square foot (oz/ft²). 1 oz/ft² = 305.1517273 g/m². Example: 15 g/m² = 15 × 0.003277058298 = 0.04915587447 oz/ft².
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1 g/m² = 0.003277058298 oz/ft²
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk gram per square metre to ounce per square foot converter to paste a column from Excel.
How to Convert Gram per Square Metre to Ounce per Square Foot
- 1 g/m² = 0.003277058298 oz/ft²
- 1 oz/ft² = 305.1517273 g/m²
- Example: convert 15 g/m² to oz/ft²: 15 g/m² = 15 × 0.003277058298 oz/ft² = 0.04915587447 oz/ft²
Formula
oz/ft² = g/m² × 0.00327705829796
or oz/ft² = g/m² ÷ 305.1517272739
Derivation from SI units:
- Mass in grams of one square metre of fabric (GSM); 1 g/m² = 0.001 kg/m².
- 1 oz/ft² = 28.349523125 g ÷ 0.09290304 m² = 305.1517192 g/m² (exact ratio)
Both units are defined exactly, so the factor is exact. Gram per Square Metre definition: gram per square metre; Ounce per Square Foot definition: ounce per square foot.
Worked examples
- A reading of 120 g/m² converts to 0.3932469958 oz/ft².
120 g/m² × 0.003277058298 = 0.3932469958 oz/ft² - A value of 250 g/m² is 0.8192645745 oz/ft².
250 g/m² × 0.003277058298 = 0.8192645745 oz/ft²
Gram per Square Metre to Ounce per Square Foot conversion table
| Grams per Square Metre (g/m²) | Ounces per Square Foot (oz/ft²) |
|---|---|
| 20 g/m² | 0.06554116596 oz/ft² |
| 50 g/m² | 0.1638529149 oz/ft² |
| 80 g/m² | 0.2621646638 oz/ft² |
| 120 g/m² | 0.3932469958 oz/ft² |
| 150 g/m² | 0.4915587447 oz/ft² |
| 180 g/m² | 0.5898704936 oz/ft² |
| 200 g/m² | 0.6554116596 oz/ft² |
| 250 g/m² | 0.8192645745 oz/ft² |
| 300 g/m² | 0.9831174894 oz/ft² |
| 400 g/m² | 1.310823319 oz/ft² |
| 500 g/m² | 1.638529149 oz/ft² |
Where it's used
Grams per Square Metre are used for woven, knitted and nonwoven fabric specifications (ISO 3801, ASTM D3776), while ounces per square foot appear in coated fabrics and laminates. Both measure fabric weight (mass per unit area, GSM), so the conversion is a fixed factor.
Gram per Square Metre to other fabric weight units
| Conversion | 1 g/m² equals |
|---|---|
| gram per square metre to ounce per square foot | 0.003277058298 oz/ft² |
| gram per square metre to ounce per square yard | 0.02949352468 oz/yd² |
| gram per square metre to gram per square centimetre | 0.0001 g/cm² |
| gram per square metre to pound per square yard | 0.001843345293 lb/yd² |
Frequently asked questions
How many ounces per square foot are in 1 gram per square metre?
1 g/m² = 0.003277058298 oz/ft².
How do I convert grams per square metre to ounces per square foot?
Multiply the value in g/m² by 0.003277058298, or divide it by 305.1517273. For example, 15 g/m² × 0.003277058298 = 0.04915587447 oz/ft².
Is the g/m² to oz/ft² conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures .
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "ounce (avoirdupois)".
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). Convert Grams per Square Metre to Ounces per Square Foot. Retrieved October 25, 2026, from https://scientificconverters.com/fabric-weight/grams-per-square-meter-to-ounces-per-square-foot/
IEEE
Scientific Converters, "Convert Grams per Square Metre to Ounces per Square Foot," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/fabric-weight/grams-per-square-meter-to-ounces-per-square-foot/