Filament calculator: convert weight and length
How many meters are left in 100 g of leftover filament? Or how heavy will a 33-meter print be? Choose material and diameter, and the calculator converts in both directions.
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Why weight and length don't convert 1:1
Filament is sold by weight, but slicers often show length. The conversion depends on the material's cross-section (diameter) and its density — PETG is denser than PLA, TPU is lighter per volume than both. Example: 100 g of PLA at 1.75 mm diameter and 1.24 g/cm³ density gives about 33.6 m of length. For PETG (1.27 g/cm³), the same weight would give only around 32.9 m.
Custom density instead of a default value
Manufacturer specs sometimes differ from the default values. Choose "Custom" and enter the value from the spool label or datasheet if you need it precisely.
Remaining amount on the spool?
For this conversion, the pure filament weight is enough. If you want to know how much filament is left on a partially used spool, first subtract the empty spool's weight.