How much filament is left on my spool?

Put the spool on a kitchen scale, take off what the empty spool weighs, and see the grams and metres left. Add your next print's weight to check it will finish.

Your spool

Filament left-

Length left-

Enough for the next print?-

Estimate only. Densities are typical published values (PLA 1.24, PETG 1.27, ABS 1.04, ASA 1.07, TPU 1.21 g/cm3); a brand can differ by a few per cent, and colour additives change it a little.

The sums

Filament left = scale reading - empty spool.
Length = grams / density, divided by the area of the filament's circle (1.75 mm across is about 2.4 mm2).
A full 1 kg spool of 1.75 mm PLA is about 335 m.
"Enough" keeps 10% spare, because purges, brims and a failed first layer use filament too.

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