Filament Weight Calculator
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Filament weight from length and diameter — or length from weight — using material density.
Filament specs
Weight
29.8 g
10 m × 1.75 mm @ 1.24 g/cm³
- Volume
- 24.05 cm³
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Filament weight from length
Filament weight depends on cross-section area, length, and material density. Volume = π × (diameter/2)² × length; weight = volume × density. PLA is about 1.24 g/cm³; PETG about 1.27; ABS about 1.04.
Slicer software estimates weight from the 3D model, but this calculator helps when you measure partial spool usage by length or weigh scraps on a scale.
Example: 10 meters of 1.75 mm PLA weighs about 30 g. A 1 kg spool of 1.75 mm PLA holds roughly 330 meters.
Common questions
What density should I use for PLA?
1.24 g/cm³ is a typical PLA default. Check your spool label — brands vary slightly. PETG and ABS use different defaults in the dropdown.
Does diameter matter much?
Yes — weight scales with diameter squared. 2.85 mm filament weighs about 2.65× more per meter than 1.75 mm of the same material.