Estimate usable roll length, area and the shortage for a print job without unwinding.
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Estimate usable roll length, area and the shortage for a print job without unwinding.
Runs in your browser
Inputs are processed on this page and are never sent to a server.
For print-shop stock checks: measure the outside diameter, core outside diameter and complete layer thickness including backing. Diameters and width are mm; thickness is µm. Annular area divided by thickness gives length. Subtract unusable leader or damage. Tight, uniform winding only; compression and air gaps cause error.
L (m) = π × (D² − d²) / (4t); D, d: mm; t: µm
266.794667 m
L (m) = π × (D² − d²) / (4t); D, d: mm; t: µm
266.794667 m
Yes. Include every layer wound onto the roll. Use measured stock thickness; verify the estimate before committing an expensive job.
Calculations run on your device. Form inputs are not sent to a server.
The initial choice follows your browser region. Your choice is remembered on this device. Gallons are US gallons. Switching units keeps your numbers unchanged and interprets them in the new unit.
Numbers stay unchanged. Check the new unit and enter the intended measurement, or select an example for that system.
For print-shop stock checks: measure the outside diameter, core outside diameter and complete layer thickness including backing.
Enter a numerical value for this quantity. Use the unit shown beside this field. mm / in
Minimum: 0.01 · Maximum: 10000 mm
For print-shop stock checks: measure the outside diameter, core outside diameter and complete layer thickness including backing.
Enter a numerical value for this quantity. Use the unit shown beside this field. mm / in
Minimum: 0 · Maximum: 10000 mm
For print-shop stock checks: measure the outside diameter, core outside diameter and complete layer thickness including backing.
Enter a numerical value for this quantity. Use the unit shown beside this field. µm / mil
Minimum: 0.1 · Maximum: 100000 µm
Enter a numerical value for this quantity. Use the unit shown beside this field. mm / in
Minimum: 0.01 · Maximum: 100000 mm
Annular area divided by thickness gives length.
Enter a numerical value for this quantity. Use the unit shown beside this field. m / ft
Minimum: 0 · Maximum: 1000000 m
Annular area divided by thickness gives length.
Enter a numerical value for this quantity. Use the unit shown beside this field. m / ft
Minimum: 0 · Maximum: 1000000 m
For print-shop stock checks: measure the outside diameter, core outside diameter and complete layer thickness including backing. Diameters and width are mm; thickness is µm. Annular area divided by thickness gives length. Subtract unusable leader or damage. Tight, uniform winding only; compression and air gaps cause error.
Calculated from your entries using the method below.
Annular area divided by thickness gives length.
Calculated from your entries using the method below.
Annular area divided by thickness gives length.
Calculated from your entries using the method below.
For print-shop stock checks: measure the outside diameter, core outside diameter and complete layer thickness including backing. Diameters and width are mm; thickness is µm. Annular area divided by thickness gives length. Subtract unusable leader or damage. Tight, uniform winding only; compression and air gaps cause error.
Calculated from your entries using the method below.
For print-shop stock checks: measure the outside diameter, core outside diameter and complete layer thickness including backing. Diameters and width are mm; thickness is µm. Annular area divided by thickness gives length. Subtract unusable leader or damage. Tight, uniform winding only; compression and air gaps cause error.
Calculated from your entries using the method below.
Mistake: Changing units and assuming the entered numbers were converted.
Fix: Numbers stay unchanged. Check the new unit and enter the intended measurement, or select an example for that system.
Mistake: Treating a result as valid outside the described scope.
Fix: Yes. Include every layer wound onto the roll. Use measured stock thickness; verify the estimate before committing an expensive job.
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