Infill Weight Calculator
Calculate 3D print weight from dimensions, infill percentage, and material density. Estimate part mass for FDM functional and structural prints.
Specialist tool for 3D Printing1 documented formula1 real workflowPrivate in your browser
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Inputs that matter
Length, Width, Height, Infill Percentage, and 2 more
Output to expect
Infill Weight Calculator
How it works
1 documented formula across 1 calculation mode
- Keep 6 bounded inputs within the limits shown beside the fields.
- Confirm that every value uses the unit and time basis shown before comparing scenarios.
- Change one input at a time to see which assumption materially changes the result.
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Reference & details
How it works
Updated July 2026
How it works
Updated July 2026Shell 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 areaInfill 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
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.