Where do I find my model volume?

Your slicer shows the model volume (usually in cm³ or ml) in the print statistics. In Cura, it appears in the bottom bar. In PrusaSlicer, check the right panel. Most CAD software can also display volume in the model properties.

Does infill affect weight?

Yes. The interior infill lattice scales linearly with the infill percentage, so on its own a 100% part has 5x the infill mass of a 20% part. In practice the solid shell (perimeter walls plus the top and bottom solid layers) adds a roughly fixed amount of mass at any infill, which compresses the real-world ratio to around 2-3x for a typical part. Because this calculator only knows your volume, its base figure is the infill-only lower bound — add a shell/waste top-up, or read your slicer’s gram figure, to capture the shell.

Why is the actual weight different from the slicer estimate?

Slicer estimates are typically accurate to within 5-10%. Differences come from purge lines, skirt/brim material, supports, and the fact that the slicer uses approximate density values. Actual weight may also vary by filament brand.

What density should I use for PLA?

Standard PLA density is 1.24 g/cm³. This can vary slightly (1.20-1.27) between brands and colours. Filled PLAs (wood, carbon fibre) have different densities. The calculator uses typical published values for each material.

Material Weight Calculator

How We Calculate This

Weight Calculation

Solid weight = Volume (cm³) × Density (g/cm³)
Infill-only weight = Solid weight × Infill%
Estimated weight = Infill-only weight × (1 + Shell & waste top-up%)
Filament length = (Weight ÷ Density) ÷ Filament cross-section area

The infill-only figure is a lower bound: it assumes the part is just the sparse infill lattice. Real prints also have a solid shell (perimeter walls plus the top and bottom solid layers), and the slicer adds supports, skirt/brim and purge. How much the shell adds depends on the part’s surface-area-to-volume ratio — small or thin-walled parts are shell-dominated and can weigh well above the infill-only number, while large blocky parts sit close to it. The optional Shell & waste top-up lets you account for that extra mass; for the exact figure, read the gram value your slicer reports.

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Always verify settings with test prints before committing to final prints.

Material Weight Calculator — Part Weight from Volume