Infill Volume Calculator
Infill volume is the portion of a 3D printed object's interior that is filled with material, expressed as a percentage of the total interior volume. Understanding infill volume helps you estimate material consumption, print weight, and cost before sending a job to the printer. This calculator multiplies the total model volume (from your slicer or CAD tool) by the infill percentage to return the filled interior volume. Note that perimeter walls are always 100% solid and are not included in this figure.
Infill volume formula
Infill volume (cm3) = Model volume * (Infill % / 100)
Void volume (cm3) = Model volume * (1 - Infill % / 100)
This is the simplest approximation. In practice, slicer software subtracts wall thickness from the interior volume before applying infill percentage, so actual printed material may differ slightly.
Infill percentage guidelines
- 10 to 15%: Display models, decorative prints. Minimal strength.
- 15 to 25%: General-purpose prints, housings, brackets with light loads.
- 25 to 40%: Functional mechanical parts, hinges, gears.
- 40 to 60%: High-load structural components.
- 80 to 100%: Maximum strength, impact-resistant parts. Longest print times.
Infill volume calculator: frequently asked questions
What infill percentage is typical for functional parts?
Functional parts that need strength typically use 20 to 40% infill. Display models and figurines often use 10 to 15%. Structural or load-bearing parts may use 50 to 100% infill.
How does infill pattern affect volume?
All infill patterns at the same percentage theoretically fill the same volume fraction. However, some patterns (gyroid, cubic) distribute material more efficiently for mechanical strength, while grid and rectilinear are faster to print.
Does this calculator account for perimeter walls?
No. This calculator computes infill volume only as a fraction of total model volume. Perimeter shells (walls) are solid and add additional material on top of the infill percentage shown here.
How does infill percentage affect strength?
Strength increases with infill up to a point, but perimeter walls typically contribute more to strength than infill. Adding more perimeters is often more effective than increasing infill percentage above 40%.
Can I use this to compare two different infill settings?
Yes. Enter the model volume once and vary the infill percentage to compare material usage between settings. The difference in volume directly translates to a difference in filament mass and cost.
Official sources
- ASTM International: ASTM F2792 Standard Terminology for Additive Manufacturing.
- America Makes: americamakes.us.
Reviewed by the CalculatorHub team, edited by James Graham, 15 June 2026. See our methodology.