Free tools
Calculators for film, paper & winding
For production planning, purchasing and design: quick answers, no sign-up, on any device.
Roll calculator
Free roll calculator for film, paper and foil: web length from roll diameter, roll diameter from length, and roll weight – with the matching winding shaft.
Calculate now →Film weight calculator
Free film weight calculator: grammage (g/m²) from density and thickness, thickness from grammage, and the weight of any area – PE, BOPP, PET, PVC, PA, foil.
Calculate now →Thickness converter µm · mm · mil · gauge
Convert film thickness between gauge, micron (µm), mil and millimetre. Free converter with a chart of common film gauges.
Calculate now →Surface speed & RPM calculator
Calculate RPM from surface speed and diameter, or surface speed from RPM – including the speed range of a winder from empty core to full roll.
Calculate now →Web tension & winding torque calculator
Calculate total web tension from specific tension and width, the winding torque at core and full roll, and the power – for unwinders and rewinders.
Calculate now →