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Quilling Coil Calculator

Size a tight paper coil from a strip, or work back from a target diameter to the strip length and joins.

Paper caliper, not strip width
Central hole; use 0 for a solid coil
Flat strip before rolling
Pre-cut strips joined end to end

For an ideal tight, evenly wound coil. Tension, glue and springback change real sizes; roll a test coil for a close match. Strip width sets the coil's height, not its diameter. Nothing is sent or stored.