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Free 3D printing filament weight calculator for FFF / FDM. Convert extruded length in meters plus filament diameter and material density into estimated grams, kilograms, pounds, and grams per meter. Ideal for spool planning, shipping estimates, and comparing slicer "filament used" to mass.
Last updated: April 17, 2026
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From slicer statistics, spool payout, or scale measurement of unused vs new spool.
Mass
29.83 g
0.0298 kg · 0.066 lb
g per meter
2.983
Filament volume (ideal round cross-section): 24.053 cm³
Density used: 1.24 g/cm³
Important:
Output
g, kg, lb
Density
g/cm³ table
Cross-section
πd² / 4 × L
Reference rate
g/m from totals
cm³
Cross-check vs geometry
Override
Datasheet g/cm³
10 m of 1.75 mm PLA at 1.24 g/cm³ (default preset) weighs about:
29.83 g
≈ 2.983 g/m · 24.053 cm³ volume
Fused filament fabrication pushes a thermoplastic through a round nozzle. Over a long straight segment, the plastic volume is approximately the volume of a cylinder with the filament diameter and the extruded length. Multiplying that volume in cubic centimeters by the solid density in grams per cubic centimeter gives mass. The calculator uses industry-typical density values; switch to Custom when your supplier lists a different number.
V(cm³) = π × d(mm)² × L(m) / 4mass(g) = ρ(g/cm³) × V(cm³)d is nominal filament diameter, L is path length in meters, ρ is homogenous melt density approximated by the solid filament datasheet.
Working in wood volume too? Try our woodworking board foot calculator and knitting yarn amount calculator.
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