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Makers & 3D Printing

Filament Length Calculator

Estimate filament length from weight, diameter and density.

Density varies by material and blend. Treat this as a useful approximation.

Notes and next steps

How it works

Estimate filament length from weight, diameter and material density.

Estimating method: Length = material volume ÷ filament cross-sectional area.

Worked example

100 g of 1.75 mm PLA is roughly 33.6 m, depending on density.

Common mistakes
  • Using the wrong density.
  • Mixing diameter units.
  • Expecting exact results from nominal filament diameter.
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