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Infill Weight Calculator

Calculate 3D print weight from dimensions, infill percentage, and material density. Estimate part mass for FDM functional and structural prints.

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Inputs that matter
Length, Width, Height, Infill Percentage, and 2 more
Output to expect
Infill Weight Calculator
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Reference & details

How it works

Shell Volume Calculation

Perimeter walls, top solid layers, and bottom solid layers form the shell — always 100% density regardless of infill setting.

Shell volume ≈ surface area × wall thickness + top/bottom × layer area

Infill Volume

Internal volume multiplied by infill percentage gives sparse infill mass. Gyroid and grid patterns approximate this percentage closely.

Infill volume = internal volume × (infill% / 100)

Weight from Density

Total volume times material density yields weight. Common FDM densities: PLA 1.24, PETG 1.27, ABS 1.04, Nylon 1.14, CF-Nylon 1.30 g/cm³.

Weight (g) = total volume (cm³) × density (g/cm³)

Updated: July 2026

Example Scenarios

Shell ~45 cm³ + infill ~20 cm³ = 65 cm³ × 1.24 g/cm³ ≈ 81 g. Useful for drone component weight budgeting.

Small bracket 30 cm³ total material at 60% effective infill: ~22 cm³ × 1.27 ≈ 28 g. Higher infill increases weight linearly with internal volume.

Vase mode (0% infill, single wall) 200 cm³ shell × 1.24 = 248 g. Significantly lighter than 20% infill version at ~320 g — affects First Class vs Priority shipping.

Common Mistakes to Avoid

Assuming 100% infill means solid throughout

Even at 100% infill, designed hollow cavities (shell mode, empty interiors) remain empty. 100% fills available internal space only — not the entire bounding box.

Using generic density for filled or specialty filaments

Carbon fiber, wood-fill, and metal-fill filaments have different densities (1.3–2.0+ g/cm³). Use manufacturer-specified density for accurate weight.

FAQ

Infill affects only internal volume, not walls. A 10% increase in infill on a large hollow part may add 30–50% more weight; on a thin-walled part, infill change barely matters.

General functional: 20–30%. High load: 40–60%. Bolts and stress points: 100% locally via modifier. Weight scales directly with infill in stressed regions.

On small parts, yes — walls dominate. On large hollow parts, infill dominates. A 4-wall vs 3-wall change adds more weight than 15% vs 20% infill on thin parts.

Within 3–5% of sliced weight when shell and infill settings match. Supports add unaccounted weight — add 5–10% if supports are enabled.

Use gyroid or honeycomb infill at moderate percentage, increase wall count instead of infill for torsion strength, and orient load paths along layer lines.

About Infill Weight Calculator

Part weight affects shipping, structural load, and material cost. This calculator estimates finished print weight from outer dimensions, wall thickness, infill percentage, and filament material density.