Filament length ↔ weight converter

Meters ↔ grams for any material and diameter, filament left on a spool, and cost per meter.

Filament

MaterialDensityg/cm³Diameter

I have

Weightg

Spool price$Filament on a full spoolgSpool on the scale nowgOptional — to see what's left.Empty spool weightgOften 150–250 g (cardboard is lighter).

Weight = π × (diameter ÷ 2)² × length × density. One meter of 1.75 mm PLA is about 2.98 g.
Densities are typical values; brands differ by a few percent, so use the manufacturer's number when you have it.

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