How do I estimate a 3D printed part’s weight?

Weight is estimated from plastic volume and material density using mass = density × volume. If you enter volume per part and part count, the tool outputs per-part and total grams.

What volume should I enter: model volume or slicer volume?

For best results, use the plastic/extrusion volume reported by your slicer (it reflects infill, shells and supports if included). If you use the raw solid model volume, results can overestimate weight for hollow/infilled prints.

Why might the real weight differ from the estimate?

Density varies slightly by brand and colour, and slicer settings (supports, brim, purge) add extra plastic. Use the optional allowance percentage to include supports/waste, and use a custom density if you have a datasheet value.

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3D Print Weight Calculator

Estimate print weight from plastic volume and material density. Optional allowance for supports/waste, filament length estimate, and cost. Everything runs locally, ad-free.

Inputs

Material (density)

Density ρ (g/cm³)

Plastic volume (per part)

Volume unit

Part count

Allowance for supports/waste (%)

Price per kg (optional)

Filament diameter (for metres estimate)

Custom diameter (mm)

Tip: commas are accepted as decimals (e.g. 106,02). For best accuracy, use your slicer’s “plastic volume / extrusion volume” if it provides one.

Volume per part: –

Total volume (incl. allowance): –

Weight per part: –

Total weight (incl. allowance): –

Estimated filament length total: –

Cost per part: –

Total cost: –

3D print weight calculator FAQ

A few common questions about estimating weight from volume and why results can vary.

Where do I find “plastic volume”?

Many slicers show material usage as grams and/or metres. Some also show a volume figure (often cm³ or mm³). If you can get the slicer’s plastic volume, it’s usually the best input because it reflects your settings.
What does the allowance percentage do?

It adds extra plastic for supports, brims/rafts, purge lines, and general overhead. If you’re estimating shipping weight for a finished part, you can leave it at 0%. If you’re estimating total job usage, try 5–15% depending on your workflow.
Why do densities vary?

“PLA” (and others) aren’t perfectly standard: brands, pigments, additives and CF fills can change density. If you have a datasheet value for your filament, use “Custom…” and enter it for the most accurate estimate.
Does this tool store any data?

No. Everything runs locally in your browser using vanilla JavaScript. No tracking, no external requests.

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