Worked Example
How to Calculate Filament Cost per Gram
Calculate filament cost per gram and print material cost from a spool price and spool weight.
Open 3D Printer Filament Cost CalculatorWhat This Example Shows
Cost per gram is the smallest useful material-price unit for filament jobs. Once the spool price is divided by net filament weight, any slicer weight can become a material cost without guessing from the spool price again.
This example keeps the math intentionally narrow. It answers the material-cost question only, then points back to the full calculator when waste, electricity, labor, failure rate, and markup need to be included.
Inputs
| Spool price | $24 |
|---|---|
| Spool weight | 1000 g |
| Print weight | 85 g |
Outputs
| Cost per gram | $0.024 |
|---|---|
| Print material cost | $2.04 |
Formula Explanation
Cost per gram = 24 / 1000. Print material cost = 0.024 × 85.
Use This Example When
- You know the spool price and net filament weight but need a per-print material number.
- You are building a spreadsheet row for filament inventory or quote preparation.
- You want to compare material cost before adding shop labor or machine time.
Before You Use the Number
- Do not use the gross spool-on-scale weight as net filament weight unless you subtract the empty spool.
- Shipping and sales tax belong in the spool price only if you want them spread across every gram.
Assumptions
- Spool weight means filament net weight.
- Shipping, tax, and waste are excluded unless you include them in spool price.
FAQ
Does this example use live prices?
No. The example uses fixed sample inputs. Replace them with your own rates.
Can I run the calculator with my own values?
Yes. Open the 3D Printer Filament Cost Calculator and enter your own assumptions.