How do you calculate filament usage for a print?

Multiply the filament consumption rate by the planned print time to get grams, then multiply grams by the unit cost. Here 28 g/hr x 14 hr = 392 g, and 392 g x $0.035 = $13.72 filament run cost.

How much does the filament for this print cost?

$13.72. That comes from 392 grams of filament at $0.035 per gram, which is the material line you would add to labor and machine time when quoting the job.

How do I know if I have enough filament on the spool?

Compare the 392 grams this job needs against the grams remaining on your spool. A fresh 1 kg spool covers it twice over; a partial spool under 392 g means you must swap or load fresh before starting.

Why does filament unit cost matter so much?

Because per-gram price ranges from a few cents for PLA to far more for nylon or carbon-filled filament. At $0.035/g this 392 g print is $13.72, but a premium engineering filament at three times the price would push the same job past $40.

What if my consumption rate varies during the print?

This uses a single average g/hr rate. For jobs with dense infill sections or heavy support structures, use a rate weighted toward those phases or split the print into segments, since a flat average can understate peak draw.

How do I get an accurate consumption rate?

Pull grams-per-hour from your slicer's material estimate divided by its time estimate, or weigh spools before and after a representative job. The 28 g/hr here is typical for a moderate-infill functional part.

Additive Manufacturing calculator

Filament Usage Calculator

Filament usage is the grams of material a print job consumes and what that material costs, derived from a per-hour consumption rate, the planned print time and the filament unit cost. Additive estimators and print-farm operators use it to cost jobs and to plan spool inventory, because material is a real line item on every print and running a spool dry mid-job means a failed build. It matters because per-gram cost varies widely by material — basic PLA versus engineering nylon or carbon-filled filament — so the same print hours can carry very different material bills.

What this calculator does

Estimate FDM filament consumption from measured extrusion rate, print time, and filament cost.
a print technician or estimator needs filament grams before kitting spools or pricing an FDM job
It multiplies filament consumption rate by planned print time to get grams used, then multiplies grams by unit cost to get the filament run cost.

Formula used

Filament used = filament consumption rate × planned print time
Filament run cost = filament used × filament unit cost

Inputs explained

Filament consumption rate:
Planned print time:
Filament unit cost:

How to use the result

Use it when costing an additive job's material or checking you have enough filament on the spool to finish a planned print without a swap.
It assumes a constant consumption rate across the print; jobs with heavy infill changes or many supports will draw faster in some phases than the average implies.

Current U.S. benchmarks

The producer price index for plastic resins and materials stands at 319.371 (BLS, May 2026), up 19.5% from a year earlier. Quotes priced off last quarter's material cost miss this move.
The U.S. has 22,301 printing and related support establishments employing about 386,248 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate filament usage for a print? Multiply the filament consumption rate by the planned print time to get grams, then multiply grams by the unit cost. Here 28 g/hr x 14 hr = 392 g, and 392 g x $0.035 = $13.72 filament run cost.
How much does the filament for this print cost? $13.72. That comes from 392 grams of filament at $0.035 per gram, which is the material line you would add to labor and machine time when quoting the job.
How do I know if I have enough filament on the spool? Compare the 392 grams this job needs against the grams remaining on your spool. A fresh 1 kg spool covers it twice over; a partial spool under 392 g means you must swap or load fresh before starting.
Why does filament unit cost matter so much? Because per-gram price ranges from a few cents for PLA to far more for nylon or carbon-filled filament. At $0.035/g this 392 g print is $13.72, but a premium engineering filament at three times the price would push the same job past $40.
What if my consumption rate varies during the print? This uses a single average g/hr rate. For jobs with dense infill sections or heavy support structures, use a rate weighted toward those phases or split the print into segments, since a flat average can understate peak draw.

Last reviewed 2026-05-12.