Roll Calculator

Eight calculators for anyone who works with material on a roll.

Enter what you know, read the answer as you type. No OK button, no ads, no
sign-up, no internet connection.


WHAT IT CALCULATES

• Roll — outer diameter, length, thickness, weight and number of wraps. Solve
for whichever one you are missing.
• Length from weight — the delivery note always has the weight and never the
metres. This gives you the metres.
• Grammage — microns to g/m² and back. The bridge between the film world and
the paper, textile and nonwoven world.
• Yield & price — m²/kg (or in²/lb), and price per kg, per metre, per m² and
per roll. Enter the price on whichever basis you were quoted; the other two
follow.
• Labels per roll — label length, gap, lanes. Works from the web length or
straight from the roll diameter.
• Slitting — how many slits fit across the master roll, how much trim is left
and what share of the width it is.
• Run time — minutes per roll, and rolls per shift once you add changeover.
• Unit converter — µm, mil, gauge, mm, inch, foot, yard, kg, lb, oz, m², ft²,
in², MSI, m/min, ft/min.


BUILT FOR THE SHOP FLOOR

Metric and imperial. The maths stays metric inside; the switch only changes
what you type and read. Film yield comes out in in²/lb exactly as the US trade
quotes it.

Material presets — LDPE, LLDPE, HDPE, PP, BOPP, CPP, PET, PA6, PS, PVC, PLA,
EVOH, PVDC, aluminium foil, paper, steel, copper. Core presets from 1" to 24".
Add your own materials and cores in the settings.

History of the last 20 calculations. Tap one to load it back into the form.

Share or copy any result as text.

Nine languages: English, Ukrainian, German, Spanish, French, Italian,
Portuguese, Arabic, Hindi.

Adapts to the device — phone, tablet, foldable, landscape. On a wide screen
the result sits beside the form instead of hiding behind the keyboard.

Light, dark and system themes, with Material You colours.


WHO USES IT

Flexible packaging and film. Paper and board. Labels and self-adhesive. Tape
and adhesives. Textiles and nonwovens. Wide-format print and vinyl. Foil and
laminates. Metal strip and coil. Membranes and geotextiles.


PRIVACY

The app has no internet permission at all. Nothing is collected, nothing is
sent, nothing is tracked. Your numbers stay on your device.

No ads. No subscriptions. No in-app purchases.