Infill Weight Calculator for 3D Prints
Enter a model volume and an infill percentage to get a rough filament weight and length. This is a planning estimate that ignores walls and solid top and bottom layers.
How to estimate infill weight
- Find your model volume in cubic centimeters from the slicer or CAD tool.
- Enter the infill percentage you plan to print.
- Pick the material so the density matches, or keep PLA.
- Read the rough filament weight and length.
Examples
100 cm3 at 20% PLA
volume 100 cm3, infill 20%, PLA 1.24
about 24.8 g (around 8.3 m)
A solid 50 cm3 part
volume 50 cm3, infill 100%, PLA 1.24
about 62 g
Frequently asked questions
How accurate is this estimate?
It is a rough planning figure. Weight equals volume times infill fraction times density and ignores perimeter walls, top and bottom solid layers, supports and brims, so real prints weigh more.
Why does the slicer report a higher weight?
Slicers add solid walls, floors, ceilings and supports on top of the infill, which this simple model leaves out. Small or thin parts differ the most.
What density should I use?
Common densities in g/cm3 are PLA 1.24, ABS 1.04, PETG 1.27, TPU 1.21 and Nylon 1.14. The default here is PLA at 1.24.
How is the filament length found?
The grams are converted back to a solid plastic volume, then divided by the 1.75 mm round cross-section area to get meters of filament.
When is this estimate closest to reality?
For large, chunky models with thin walls relative to their bulk, where infill dominates the total plastic used.
Related tools
Filament Weight Calculator
Convert 3D printing filament length to weight or weight to length. Works for PLA, ABS, PETG, TPU and Nylon at 1.75 mm or 2.85 mm. Free and fast.
Filament Cost Calculator
Work out the filament cost of a 3D print from grams used and spool price per kg. Get the dollar cost and price per gram instantly. Free to use.
3D Print Cost Calculator
Price a full 3D print job: filament, electricity, machine wear, labor and markup. Get a clear cost breakdown and total in dollars. Free tool.
Print Electricity Cost Calculator
Estimate the electricity cost of a 3D print from printer wattage, print time and your power rate. See kWh used and the dollar cost. Free tool.
Resin Cost Calculator
Calculate the resin cost of an SLA or MSLA print from milliliters used and resin price per liter. See total cost and price per ml. Free tool.