The filament cost of a print is the grams used divided by 1000, times the price per kilogram. A print using 80 grams of filament that costs 25 per kilogram uses 0.080 times 25, which is 2.00 of material. Enter your grams and spool price to see the filament cost and how much of the spool it uses.
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How to Use the Filament Cost Calculator
- Enter the grams of filament the print uses, from your slicer.
- Enter your spool price per kilogram.
- Set the spool size if it is not a standard 1000 grams.
- Read the filament cost, cost per gram and the share of the spool used.
| Result | What it means |
|---|---|
| Filament cost | The material cost of this print, in your currency. |
| Cost per gram | A handy unit price for quick estimates. |
| Cost per 100 g | The cost of every 100 grams of filament. |
| Spool used | How much of the spool this print consumes. |
What Is Filament Cost?
Filament cost is simply the value of the plastic a print consumes. It is the single biggest cost in most FDM 3D printing, so knowing it is the first step in pricing a print or budgeting a project.
Because filament is sold by the kilogram but prints are measured in grams, a small conversion turns the spool price into the cost of any individual print. That lets you compare filaments and quote jobs with confidence. It is also the number that makes the case for buying filament in bulk or on offer: a small drop in the price per kilogram quietly lowers the cost of every single print you make from that spool.
How Does the Filament Cost Calculation Work?
filament cost = grams used / 1000 x price per kg- Divide the grams used by 1000 to get kilograms.
- Multiply by the spool price per kilogram for the cost.
- Divide the price by 1000 for the cost per gram.
- Divide the grams by the spool size for the share of a spool used.
The cost per gram is worth remembering: multiply it by any print weight for an instant material cost without reaching for the calculator.
Filament Cost Example
A print uses 80 grams of PLA that costs 25 per kilogram. Eighty grams is 0.080 kilograms, so the filament cost is 0.080 times 25, which is 2.00. The cost per gram is 25 divided by 1000, or 0.025, and the print uses 8 percent of a 1000 gram spool. Switch to a 40 per kilogram engineering filament and the same print jumps to 3.20 in material. That difference, multiplied across dozens of prints, is exactly why makers track filament cost rather than guessing it.
What Affects Filament Cost
Grams Used
Bigger parts, higher infill and more supports all raise the grams and the cost directly.
Spool Price
Basic PLA is cheap, while carbon-filled, flexible and engineering filaments cost much more per kilogram.
Spool Size
Filament comes in 250 g, 500 g, 1 kg and larger spools; the price per kilogram is the fair comparison.
Waste and Purging
Multi-colour prints and purging waste extra filament, which the slicer grams usually include.
Filament Prices Compared
Typical price bands per kilogram, and the cost of an 80 gram print.
| Filament | Price per kg | Cost of 80 g |
|---|---|---|
| Basic PLA | 18 to 25 | 1.44 to 2.00 |
| PETG | 22 to 30 | 1.76 to 2.40 |
| ABS / ASA | 22 to 30 | 1.76 to 2.40 |
| Engineering / filled | 40 to 80 | 3.20 to 6.40 |
Prices vary widely by brand and region; use your own spool price for an accurate figure.
When to Use a Filament Cost Calculator
Quoting a Print
Get the material cost fast before adding power, time and markup.
Comparing Filaments
See how a premium filament changes the cost of the same part.
Tracking a Spool
Check how much of a spool a project will use before you start.
Common Filament Cost Mistakes
1. Using Model Weight
Use the slicer grams, which include infill and supports, not the solid model volume.
2. Comparing Spool Prices Not per Kg
A cheap small spool can cost more per kilogram; always compare per kilogram.
3. Ignoring Waste
Purging and failed sections use filament too; the slicer estimate usually covers the print itself.
4. Forgetting Other Costs
Filament is only part of the total; electricity, failures and your time add more.
Accuracy and Limitations
The material cost is exact for the grams and price you enter. It is the filament portion only, not the full print cost.
What it calculates accurately
- Filament cost from grams and price
- Cost per gram and per 100 g
- The share of a spool used
What it does not do
- Add electricity, wear or your time
- Set a selling price
- Estimate the grams for you
How We Calculate the Result
Frequently Asked Questions
How do you calculate filament cost?
Divide the grams used by 1000 and multiply by the spool price per kilogram. Eighty grams at 25 per kg costs 2.00.
How much does 1 gram of filament cost?
Divide the price per kilogram by 1000. Filament at 25 per kg is 0.025 per gram; at 40 per kg it is 0.040.
How much of a spool does a print use?
Divide the grams used by the spool size. An 80 gram print uses 8 percent of a 1000 gram spool.
Why compare filament per kilogram?
Spools come in different sizes, so the price per kilogram is the only fair way to compare value between them.
Should I use model weight or slicer weight?
Use the slicer grams, which include infill, walls and supports. The model volume alone understates the filament used.
Is filament the biggest 3D printing cost?
For most FDM prints, yes. It typically makes up 70 to 90 percent of the material and power cost.
Does filament type change the cost a lot?
Yes. Engineering and filled filaments can cost two to four times basic PLA per kilogram, changing the print cost sharply.
How do I get the full print cost?
Add electricity, a failure allowance and your time to the filament cost. Our 3D printing cost calculator does the first two.
Is my data saved?
No. The calculator runs entirely in your browser and nothing you enter is stored or sent anywhere.
Sources
- 3D printing filament (Wikipedia).
- Fused filament fabrication (Wikipedia).
- Polylactic acid (PLA) (Wikipedia).
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Costing your filament?
Explore all hobby calculatorsFor hobby and small-business costing. This is the filament portion only; add electricity, failures, printer wear and your time for a full print cost. Spotted an error? Let us know.
Author
Shakeel Muzaffar is the Founder and Editor-in-Chief of MultiCalculators.com, bringing over 15 years of experience in digital publishing, product strategy, and online tool development. He leads the platform's editorial vision, ensuring every calculator meets strict standards for accuracy, usability, and real-world value. Shakeel personally oversees content quality, formula verification workflows, and the platform's commitment to publishing tools that are genuinely useful for students, professionals, and everyday users worldwide.
