Updated 19 October 2026

3D print weight calculator: grams from volume

A printed part is not solid plastic. An FDM part is a skin of solid walls around a partly filled interior, so it weighs less than the same volume of material. This calculator estimates the printed weight from two numbers every CAD tool reports: the volume and the surface area.

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Estimate the weight

How it is calculated

shell = min(V, A x w) mass = density x (shell + (V - shell) x infill)

• V is the volume and A the surface area of the model, both from CAD. A x w is the volume of a skin of thickness w over every face, top and bottom included.
• Where that skin would be thicker than the part itself, the part is treated as solid.
• Resin (SLA) parts are printed solid, so their weight is the density times the volume.
• The densities are the nominal values of each material, in g/cm³. A coloured or filled grade can differ by a few percent.

Assumptions and limits

This is an estimate for planning, not a weighed part. It leaves out supports, the brim and the extra material where walls meet the infill, so a real part usually comes out somewhat heavier. A thin part that is mostly skin is estimated better than a thick one, where the infill pattern matters more.

From the numbers to a part

A weight estimate sizes the batch you will handle, store and ship. Upload the model and the instant quote returns a price and a delivery date in under a minute, with no account. 3Descu is an ISO 9001:2015 certified factory with 200+ printers, FDM and SLA only. A part that does not match the agreed specification is reprinted or refunded.

Get a factory price for this part Upload a file and the price appears in under a minute.

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