Infill Weight Calculator for 3D Prints

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. Expect it to read low, most for small or thin-walled parts.

weightG = modelVolumeCm3 x (infillPercent / 100) x density. For 100 cm3 at 20% in PLA that is 100 x 0.20 x 1.24 = 24.8 grams. The result is rounded to two decimals.

The grams are converted back to a solid plastic volume, then divided by the round cross-section of 1.75 mm filament (about 2.405 square millimeters) to get meters. It always assumes 1.75 mm, so it is not correct for 2.85 mm filament.

The dropdown covers PLA 1.24, ABS 1.04, PETG 1.27, TPU 1.21 and Nylon 1.14 g/cm3, with PLA as the default. Pick the one that matches your spool so the weight and length track your material.

Slicers add solid walls, floors, ceilings, supports and brims on top of the infill, none of which this simple model counts. For an exact number, slice the part and read its estimate. Use this tool for a quick gut check.

Most slicers show it in the object info panel, and CAD tools report it under mass properties. If yours gives cubic millimeters, divide by 1000 to get cubic centimeters before entering it here.

The volume field accepts up to 2000 cm3 and infill runs from 1 to 100 percent. For a very large model, split it into parts and add the estimates together.

For large, chunky models with thin walls relative to their bulk, where infill dominates the total plastic used. Small figurines and thin shells are where it drifts furthest low.

Yes. The calculation runs in your browser and nothing you enter is uploaded to a server.