Filament Length Calculator
Calculate how many metres of filament are on a spool by weight and material.
How many metres of filament are on a spool is one of those questions every 3D printer owner searches at least once. The answer depends on two things: the weight of the spool and the density of the material. A 1kg spool of PLA (density 1.24 g/cm³) at 1.75mm diameter gives you around 332 metres — enough for dozens of small prints. ABS is less dense so you get more length per kilogram (~396m/kg). PETG is denser so you get slightly less (~323m/kg). This calculator works for any spool weight and both 1.75mm and 2.85mm diameters.
335.3 metres
1,100 feet · 33,528 cm
Length by spool size (PLA, 1.75mm)
| Weight | Length |
|---|---|
| 0.25kg | 84m |
| 0.5kg | 168m |
| 1kg | 335m |
| 2kg | 671m |
Filament length reference (1.75mm)
| Material | 0.5kg | 1kg | 2kg |
|---|---|---|---|
| PLA | 166m | 332m | 665m |
| PLA+ | 166m | 332m | 665m |
| PETG | 162m | 323m | 646m |
| ABS | 198m | 396m | 792m |
| TPU | 170m | 340m | 681m |
FAQ
How many metres of filament in a 1kg PLA spool?
A standard 1kg spool of PLA at 1.75mm diameter contains approximately 332 metres of filament. This is based on PLA's density of 1.24 g/cm³. Budget spools sold as 1kg sometimes contain slightly less (950–980g) so actual length may vary by 5–10%.
How many metres of filament in a 1kg PETG spool?
A 1kg spool of PETG at 1.75mm contains approximately 323 metres. PETG has a slightly higher density than PLA (1.27 g/cm³) so you get marginally less length per kilogram.
Does filament diameter affect how many metres you get?
Yes significantly. 2.85mm diameter filament is much thicker — a 1kg PLA spool at 2.85mm gives around 125 metres vs 332 metres at 1.75mm. Most modern desktop printers use 1.75mm; 2.85mm is used by Ultimaker and some older Lulzbot printers.
How do I calculate filament length from weight?
Formula: Length (m) = Weight (g) / (density × π × (diameter/2)²) / 100. For 1kg PLA at 1.75mm: 1000 / (1.24 × π × 0.875²) / 100 = ~332m. This calculator does it instantly for any weight and material.
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