How much does 1 metre of PLA filament weigh?

At 1.75mm diameter, 1 metre of PLA weighs approximately 2.98g. At 2.85mm diameter, it weighs about 7.92g. This is calculated from the cross-sectional area and PLA density of 1.24 g/cm³.

How many metres of filament are on a 1kg spool?

A 1kg spool of 1.75mm PLA contains roughly 335 metres. For 2.85mm PLA, it is about 126 metres. Different materials vary due to density differences.

Does filament diameter affect how much is on a spool?

Yes, significantly. 2.85mm filament has roughly 2.65 times the cross-section of 1.75mm, so a 1kg spool of 2.85mm has far fewer metres than a 1.75mm spool of the same weight.

Why does material type matter for the conversion?

Different materials have different densities. PLA is 1.24 g/cm³, while ABS is only 1.04 g/cm³. A metre of ABS weighs less than a metre of PLA at the same diameter, so you get more length per kilogram.

3DPrintCalcs

Filament Length to Weight Calculator

Convert filament length to weight and vice versa for any diameter and material.

Filament DiameterMost FDM printers use 1.75mm; 2.85mm (a.k.a. 3mm) is used by Ultimaker and some older machines.

MaterialDensity drives length per kg: lighter ABS (1.04) gives more metres than PLA (1.24) at the same weight.

Conversion DirectionSelect the conversion direction

Length

How We Calculate This

Formula

Cross-section = π × (diameter/2)²
Volume per metre = Cross-section × 100cm
Weight per metre = Volume × Material density
Length to weight: Weight = Length × Weight per metre
Weight to length: Length = Weight / Weight per metre

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Last updated: March 2026

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