Calculate fabric GSM (Grams per Square Meter) using every standard textile industry method – GSM cutter, knitted fabric construction, woven fabric construction, fabric roll GSM, and unit conversion. Every field carries a default sample value, so you can click Calculate straight away and see how each formula works.
The most common lab test for knitted, woven, and nonwoven fabric.
A round sample is cut with a GSM cutter of known area and weighed on a digital scale.
Formula: GSM = (Sample Weight in grams × 10,000)
÷ Sample Area in cm²
Used to estimate GSM before production, from fabric construction parameters.
Formula: GSM = [(Wales/inch × Courses/inch × Loop Length in mm)
÷ Yarn Count (Ne)] × 0.9154
Estimates GSM from thread density and yarn count, before the fabric is produced.
Formula: GSM = [(EPI ÷ Warp Ne) + (PPI ÷ Weft Ne)] × 23.5
Used on the factory floor to verify bulk fabric weight against approved GSM.
Formula: GSM = Total Fabric Weight (grams)
÷ (Length in meters × Width in meters)
Converts US buyer specifications (common for denim and heavy wovens) into GSM.
Formula: GSM = Weight (oz/yd²) × 33.906
Used for costing and yarn/fabric requirement planning once GSM is fixed.
Formula: Total Weight (kg) =
(GSM × Width in meters × Length in meters) ÷ 1000
