Filament length to weight calculator
How many meters are left on that partial spool? How much does 5 meters weigh? Both directions update instantly. Pricing a print? Take the grams straight into the quote workspace.
0 m
| Cost per meter | €0.000 |
| Cost per gram | €0.000 |
| Cost of this amount | €0.00 |
| Volume | 0 cm³ |
| Length in feet | 0 ft |
| Full spool length | 0 m |
Meters per 1 kg spool, per material: PLA · PETG · ABS · ASA · TPU · Nylon · PC
How the conversion works
Filament volume is weight ÷ density, and length is volume divided by the strand's cross-section π × (diameter ÷ 2)². Editing either the weight or the length field recomputes the other. Densities used (g/cm³): PLA 1.24, PETG 1.27, ABS 1.04, ASA 1.07, TPU 1.21, Nylon 1.14, PC 1.20. Pick Custom… to enter any density yourself — PLA-CF ≈ 1.30, woodfill ≈ 1.15–1.25, CopperFill ≈ 3.9 g/cm³. Once you know the grams, the filament cost calculator turns them into money per print, and the print time cost calculator adds electricity and machine wear.
Frequently asked questions
How many meters are on a 1 kg spool of PLA?
About 335 m of 1.75 mm PLA — the tool computes this from PLA’s density of 1.24 g/cm³. ABS is less dense (1.04 g/cm³), so a 1 kg ABS spool holds roughly 400 m.
How much does 5 meters of filament weigh?
For 1.75 mm PLA, about 15 g: cross-section 2.41 mm² × 5000 mm × 1.24 g/cm³ ≈ 14.9 g. Type 5 in the length field and the weight updates instantly.
Does the material really matter for the conversion?
Yes — length comes from weight ÷ density, and densities differ: PLA 1.24, PETG 1.27, ABS 1.04, ASA 1.07, TPU 1.21, Nylon 1.14, PC 1.20 g/cm³. Picking ABS instead of PLA changes the result by about 19%.
Is 2.85 mm the same as "3 mm" filament?
Yes — "3 mm" filament is nominally 2.85 mm, and the converter uses 2.85 mm for the cross-section. One meter of 2.85 mm PLA weighs about 7.9 g.
Why does this converter disagree with some big-name calculators?
Density assumptions. We use the accepted datasheet values — TPU 95A at 1.21 g/cm³ and PLA at 1.24 g/cm³ — while some well-known calculators use 1.30 for PLA and 1.27 for TPU. That alone shifts the meters-per-kg result by roughly 2–7%, so the same spool looks longer or shorter depending on which density the tool assumes.