How many meters in 1 kg of PLA?
A 1 kg spool of PLA holds about 335 meters of 1.75 mm filament, or about 126 meters of 2.85 mm.Both figures are computed from the PLA density of 1.24 g/cm³ — the same math the filament length to weight calculator runs interactively for any weight and material.
~335 m
per 1 kg of 1.75 mm PLA — ~126 m at 2.85 mm
| Spool size | 1.75 mm | 2.85 mm |
|---|---|---|
| 1 kg | ~335 m | ~126 m |
| 750 g | ~251 m | ~95 m |
| 500 g | ~168 m | ~63 m |
Why density decides the length
Filament is sold by weight, but prints consume length — and the bridge between the two is density. A meter of 1.75 mm strand has a fixed volume (cross-section × length); heavier-per-volume material packs more grams into that meter, so a kilogram of it runs out sooner. PLA is 1.24 g/cm³. Across the common materials the spread is real: ABS 1.04 and ASA 1.07 g/cm³ are the lightest, Nylon 1.14, PC 1.20, TPU 1.21 and PLA 1.24 in the middle, PETG 1.27 g/cm³ the densest — so the same 1 kg spool holds ~400 m of ABS but only ~327 m of PETG. PLA is the reference material most length-per-kg figures quoted online assume.
Weigh what's left
These figures describe full spools — real life is a half-used spool of unknown length. Put it on a kitchen scale, subtract the empty-spool weight for its brand from the spool tare database, and multiply the remaining grams by 0.335 to get meters of 1.75 mm PLA. The spool remaining calculator does all of it in one step, with brand tare presets and per-material density built in.
Frequently asked questions
How many meters are in 1 kg of PLA filament?
About 335 meters of 1.75 mm PLA, or about 126 meters of 2.85 mm. The figure is computed from the PLA density of 1.24 g/cm³: volume = weight ÷ density, length = volume ÷ strand cross-section.
Why does PLA have a different length per kg than other materials?
Because a spool is sold by weight, not length, and materials differ in density. PLA is 1.24 g/cm³ — denser filament packs more mass into each meter, so the same kilogram yields fewer meters. ABS (1.04 g/cm³) yields roughly a fifth more meters per kg than PETG (1.27 g/cm³).
How many meters are on a 750 g or 500 g spool of PLA?
At 1.75 mm: ~251 m on a 750 g spool and ~168 m on a 500 g spool. At 2.85 mm: ~95 m and ~63 m respectively. Length scales linearly with weight, so any other spool size is the 1 kg figure times its weight in kilograms.
How do I find out how many meters are left on my partial PLA spool?
Weigh the spool, subtract the empty-spool tare weight for its brand, and multiply the remaining grams by 0.335 m/g (1.75 mm) — or use the spool remaining calculator, which has the tare presets and this density math built in.