Filament density

Definition

Filament density is mass per cubic centimetre of the solid plastic. Length-to-weight uses the cylinder volume πr²L times density. PLA is typically 1.24 g/cm³, PETG 1.27, ABS 1.04, TPU around 1.21. Spool labels quote 1 kg of plastic, not 1 km of length — 330 m of 1.75 mm PLA is roughly a kilogram. Colour and foam additives shift density a few percent.

Calculators that use this

• FDM core & costs

  Filament Length to Weight Converter

  Convert metres of 1.75 mm or 2.85 mm filament to grams using PLA, PETG, ABS, TPU, nylon or ASA density. Toggle ounces for US scales.

• FDM core & costs

  Remaining Filament Estimator

  Estimate remaining PLA, PETG or ABS on a 1.75 mm or 2.85 mm spool from current weight minus empty-spool tare. Converts leftover grams to metres and a 1 kg-net percentage.