01 / METHOD
How to use this filament use tool
- Choose whether weight or length is known.
- Enter filament diameter and density; common nominal defaults are provided.
- Add spool weight and price to estimate cost for the calculated material.
02 / APPLICATIONS
When it is useful
- Check if the remaining spool is enough
- Translate slicer grams into meters
- Estimate the material portion of a quote
03 / MODEL
Assumptions and limitations
Assumptions
- Filament is treated as a uniform round cylinder.
- Density is constant across the material.
- Cost is allocated linearly by mass.
Limitations
- Real diameter, density, spool tare, purge, supports, and failed prints affect actual usage.
- This is material cost only, not electricity, labor, depreciation, or tax.
04 / FAQ
Common questions
How is filament length calculated?
Mass is divided by material density and the circular cross-sectional area of the filament.
What density should I use?
Use the manufacturer datasheet when possible. The default 1.24 g/cm³ is a common nominal value for PLA, not a universal value.
Does spool price include the empty spool?
The calculator treats the entered spool mass as net filament. Use the net material weight listed by the seller.