GSM Fabric Weight Calculator: Roll Weight and Garment Weight
This GSM based textile calculator lets you switch between fabric roll weight mode and garment weight mode. It is built for knit and woven fabrics used in T shirts, sweatshirts and general apparel.
Fabric Roll Weight Calculator
Use this mode to calculate fabric roll weight from GSM, fabric width and roll length. The calculator returns fabric area in square meters plus roll weight in grams and kilograms for production planning, shipping and costing.
Tip: If roll length is approximate, this calculator still gives a useful estimate for transport weight and basic costing.
What Is GSM Fabric Weight and Why It Matters
GSM stands for grams per square meter and is the main way textile engineers describe fabric weight. It helps you compare light, medium and heavy fabrics even when width and roll length are different. A higher GSM means more fiber per square meter, so fabric becomes heavier, warmer and usually more expensive.
In production, understanding GSM fabric weight is essential for garment costing, fabric booking, sampling, quality control and shipping weight. When you combine GSM with fabric width and length you can quickly estimate total kilograms, roll weight and how many garments you can cut from each roll.
How to Calculate Fabric Roll Weight From GSM
The fabric roll weight calculator on this page uses the same method used in textile mills and factories. The steps are simple:
- Convert fabric width from centimeters to meters.
- Multiply width in meters by roll length in meters to get fabric area in square meters.
- Multiply area in square meters by GSM to get roll weight in grams.
- Divide grams by 1000 to get roll weight in kilograms.
Formula: Roll weight (kg) = GSM × width (m) × length (m) ÷ 1000. The calculator does this instantly for you and displays fabric area, grams and kilograms with clean values.
How to Calculate Garment Weight and Pieces per Kilogram
Garment weight depends on how much fabric area is used per piece and the GSM of that fabric. This garment mode is useful for merchandisers, planners and small brands that need quick estimates.
- Convert fabric width from centimeters to meters.
- Multiply width in meters by fabric length per garment in meters to get garment fabric area.
- Multiply garment area by GSM to get base garment fabric weight in grams.
- Add an extra percentage for ribs, cuffs, collars and cutting wastage.
- Divide 1000 by the final garment weight to get pieces per kilogram.
Formula: Garment weight (g) = GSM × width (m) × length per garment (m), then Garment weight with extra = base weight × (1 + extra percent ÷ 100). Pieces per kilogram are calculated as 1000 ÷ garment weight with extra.
Typical GSM Ranges for Common Textile Products
Knowing common GSM ranges helps you select the right fabric and set realistic expectations for garment weight:
- 120 to 150 GSM - lightweight T shirts, polo fabric, summer tops.
- 160 to 200 GSM - standard T shirts, single jersey, everyday knitwear.
- 220 to 280 GSM - heavier knits, premium tops, interlock, light sweat fabrics.
- 300 to 400 GSM - hoodies, fleece, sweatshirts, winter knitwear.
- 450 to 700 GSM - towels, bathrobes, heavy pile fabrics.
These ranges are approximate, but they give a useful starting point when combining GSM, roll weight and garment weight calculations.
Who Should Use This GSM Fabric Weight Calculator
This online tool is built for anyone working with knit and woven fabrics:
- Textile and apparel merchandisers who need quick fabric booking estimates.
- Production planners and industrial engineers calculating consumption and yield.
- Small brands and startups checking fabric offers from mills or wholesalers.
- Students in textile and fashion programs learning GSM, fabric weight and costing.
- Quality and sourcing teams comparing samples from multiple suppliers.
By combining roll weight mode and garment mode in one place, the calculator saves time and reduces manual math errors during sampling and bulk production.
Frequently Asked Questions about GSM and Fabric Weight
What is GSM in fabric?
GSM means grams per square meter and describes how much a square meter of fabric weighs. It is the standard unit for fabric weight in textile engineering and is used for both knit and woven fabrics.
How do I calculate fabric roll weight from GSM?
Multiply GSM by fabric width in meters and roll length in meters to get grams, then divide by 1000 to get kilograms. The fabric roll weight calculator on this page does this automatically once you enter GSM, width and length.
How do I estimate garment weight from GSM?
Estimate the fabric length used per garment, multiply width in meters by that length to get area, then multiply by GSM. Add an allowance for ribs and cutting wastage to get a realistic garment weight in grams and pieces per kilogram.
How accurate is this GSM based garment weight calculator?
The formulas are the same as manual calculations used in factories. Accuracy depends on how accurate your GSM, fabric width and fabric length per garment inputs are. For final costing and buyer approvals, always verify with real sample weighing.
Can I use this calculator for both knit and woven fabrics?
Yes. The math for GSM, area and weight is the same for knit and woven fabrics. You can use the calculator for jersey, interlock, pique, fleece, shirting, denim and many other constructions.
Does the calculator include ribs, collars and trims?
The garment mode includes an extra percentage field for ribs, collars, cuffs and cutting loss. You can set this value based on your style - many factories use 5 to 15 percent depending on garment type and marker efficiency.
