RollStock Planner

Roll length calculator: estimate rolled material from outer diameter, core diameter and effective caliper. Enter the roll’s outer diameter, core outside diameter, and effective caliper to estimate length. Add width for area, subtract used length for a partial roll, or calculate an expected outer diameter from a known length.

Every result keeps its boundary visible: calculations assume ideal concentric, tightly wound layers and use the effective caliper you provide. Compression, stretch, air gaps, irregular winding, and damaged cores are not corrected. Results are planning estimates, not certified inventory, procurement, material-performance, or production guarantees.

Free includes unlimited calculations, metric and imperial entry, partial-roll estimates, area, formula notes, light/dark themes, and one locally recovered working draft.

Optional Lifetime Pro is a one-time Google Play purchase—not a subscription. It adds named roll snapshots, user-created material templates, measured-versus-estimated context, two-roll job comparisons and allocation notes, plus user-controlled JSON backup/restore, CSV export, and text export. The current local price is supplied by Google Play.

No account, ads, analytics, location, camera, microphone, notifications, or cloud sync. Core calculations and records stay on your device. Export and restore happen only through an Android file location you choose.

If Greycon Calculator is on your shortlist, use this roll length calculator for a print-room worksheet based on your own measured inputs. A partial roll calculator adds context when allocating a remnant to a future project; confirm usable stock separately before committing it.