How much filament is left on your spool?
Weigh the spool, subtract the empty spool, and what's left is filament. Polymaker publishes 140 ± 7 g for its 1 kg cardboard spool; Prusa records every Prusament spool individually. Enter your print's grams to see if it will finish.
Last updatedOct 17, 2026
Spool weightsMakers' own pages, accessed Oct 17, 2026
What's left
Next printn/a
Filament left0 g
| Length left | 0 m |
| Share of a full spool | 0% |
| Prints like this one left | 0 |
Empty spool weights the makers publish
Only figures from the filament makers' own pages, accessed Oct 17, 2026. Community databases collect many more brands, measured by users; weigh one of your own empty spools if your brand isn't here.
How this is calculated
- Filament left = scale reading − empty spool weight.
- Length left = grams ÷ (density × cross-section area). A 1.75 mm strand has a cross-section of 2.405 mm², so 1 g of PLA at 1.24 g/cm³ is about 0.34 m.
- Next print fits if filament left ≥ the print's grams × (1 + safety margin). The margin is your choice; it covers purge lines, multicolor flushing and scale error.
- Published weights vary. Polymaker gives a tolerance (±7 g on 1 kg cardboard spools). Polymaker's own table lists its 0.5 kg cardboard spool at 190 g, heavier than the 1 kg one at 140 g; that's shown as published. Bambu Lab's store lists its reusable spool at 250 g under "Weight" without saying whether that is the bare spool or as packed, so weigh yours.
Also useful: the filament length converter for grams to meters on any material, and multicolor purge waste if the print uses an AMS.