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Qalc AI
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Roll Length Calculator
All misc tools
Calculate length of material on a roll. Paper, film, fabric.
Roll Dimensions
Inches
Millimeters
Outer Diameter (in)
Inner Diameter (in)
Material
Thickness (in)
Foil (0.0006)
Paper (0.004)
Cardstock (0.012)
Vinyl (0.06)
Length Estimate
Length (feet)
1191.2 ft
Length (meters)
363.1 m
Material cross-section
About this calculator
Roll Math
Length = π × (Outer² − Inner²) / (4 × Thickness). Assumes uniform thickness and no air gaps.
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Pro Tips
Measure thickness with calipers.
Compression affects accuracy.
