No filament runout sensor? Weigh the spool on a kitchen scale, subtract the empty spool weight, and this tool tells you how many grams and metres remain — so you know if there’s enough for the next print.
About this calculator
Remaining filament = current weight − empty spool weight. Percentage and length are derived from the full net weight and the material density. Currency and typical prices are auto-detected from your locale and fully editable, so it works whether you’re in the US, UK, Germany, India, Vietnam or anywhere else.
FAQ
What’s the empty spool weight?
Cardboard spools weigh ~130–200 g; plastic spools ~200–250 g. Many brands print it on the label. Weigh an empty spool once and reuse the number.
How accurate is the length estimate?
It is derived from remaining mass and material density, so it’s a close estimate for planning — not an exact extrusion measurement.
Reviewed 2026-08-18. Estimates for planning; verify critical values yourself.