Filament Cost Calculator — Material Cost per Print
Work out the material cost of a print based on filament weight used and spool price.
How We Calculate This
Formula
- Cost per gram = Spool price / Spool weight
- Adjusted weight = (Print weight + Purge / waste) x (1 + Fail rate / 100)
- Print cost = Adjusted weight x Cost per gram
- Prints per spool = floor(Spool weight / Adjusted weight)
With the default advanced options (fail rate 0%, purge 0g) the adjusted weight equals the print weight, so the print cost is simply Print weight x Cost per gram and prints per spool is Spool weight / Print weight. Enter a fail rate or purge amount to fold failed prints and purge lines into the per-print cost.
This gives you the raw material cost only. For total print cost including electricity and wear, use our Print Cost Calculator.
Frequently Asked Questions
Related Calculators
Filament Length Calculator
Calculate the total length of filament on a spool from its weight and diameter.
Filament Weight Calculator
Estimate how much filament a print will use by weight from model volume.
Spool Life Calculator
Estimate how many prints you can get from one spool of filament.
Filament Diameter Calculator
Calculate cross-sectional area and volume per metre for any filament diameter.
Filament Density Calculator
Look up or calculate filament density for common 3D printing materials.
Last updated: February 2026
All calculations are estimates. Always verify settings with test prints before committing to final prints.