Net Roll Weight and Length: Calculation Guide
Metres per kilogram equals 1,000 divided by the measured linear weight in grams per metre. For example, a net weighing 8 g/m yields 125 m/kg before allowances. Net mass must exclude the core and packaging. GSM alone is insufficient unless the appropriate developed width or area is also known.
Use linear weight
Length in metres = net mass in kg × 1,000 ÷ linear weight in g/m. Net mass in kg = length in metres × linear weight in g/m ÷ 1,000. Exclude core and wrapping mass.
Worked example
A 500 m roll at 8 g/m contains 4 kg of net. At a hypothetical 100 currency units per kg, its material cost is 0.8 per metre. These are arithmetic examples, not a product specification or sales quotation.
Do not confuse GSM and g/m
GSM measures mass per square metre, while g/m measures mass per metre of roll. Converting requires the relevant developed width or measured area; tubular mesh stretch makes casual conversions unreliable. Confirm measured linear weight with the supplier.
Next steps
Request a sample and written quotation or compare the product range. For dimensions and load guidance, use the indicative selection guide; its presets are not engineering calculations.