Filament Remaining Calculator
Weigh your spool and find out how many grams and meters of filament are left.
Presets are community-measured approximations. For best results weigh one of your own empty spools and type it in (it's remembered).
Filament remaining
– grams
- Length
- –
- Of a 1 kg spool
- –
About this tool
Put your part-used spool on a kitchen scale and type in the weight. The calculator subtracts the empty spool and tells you what's left in grams, meters and as a share of a 1 kg spool. Presets cover common brands (Prusament ≈ 201 g, cardboard spools ≈ 130–145 g, generic plastic ≈ 230 g), or save your own measurement for better accuracy.
The meters figure comes from material density and filament diameter: a full 1 kg spool of 1.75 mm PLA holds roughly 335 m, so 250 g remaining is about 84 m. Compare the grams with your slicer's estimate to see if a print will make it. The math runs in your browser and nothing is uploaded; your spool and material choices are remembered on your device.
Frequently asked questions
- How accurate is weighing a spool to estimate remaining filament?
- A kitchen scale is within a few grams; the real uncertainty is the empty spool weight, which varies by brand and batch. Use the presets as a starting point, or weigh an empty spool once and save your own number.
- How many meters of filament are on a 1 kg spool?
- It depends on density and diameter. For 1.75 mm filament: PLA is about 335 m/kg, PETG about 327 m/kg and ABS about 400 m/kg.
- Will my remaining filament be enough for a print?
- Compare the grams shown here with your slicer's filament estimate for the print. Leave a 5–10 g safety margin, since running out mid-print usually ruins the part.