How long is 1 kg of nylon filament?
A 1 kg spool of 1.75 mm Nylon (PA) is about 364.7 m long; a kilogram of 2.85 mm Nylon (PA) is about 137.5 m. That uses a density of 1.14 g/cm³. For PA12 (1.01 g/cm³) it is about 412 m and 155 m. Convert any weight or length below.
Nylon (PA) grams ↔ meters converter
How much Nylon (PA) is left on my spool?
Nylon (PA) length and weight at a glance
| Filament | Cross-section | Per kg | 1 m weighs | 1 g is |
|---|---|---|---|---|
| PA6 1.75 mm | 2.405 mm² | 364.7 m | 2.74 g | 36.5 cm |
| PA6 2.85 mm | 6.379 mm² | 137.5 m | 7.27 g | 13.8 cm |
| PA12 1.75 mm | 2.405 mm² | 411.6 m | 2.43 g | 41.2 cm |
| PA12 2.85 mm | 6.379 mm² | 155.2 m | 6.44 g | 15.5 cm |
Which density this page uses
Nylon is a family of polymers. PA6 and PA6/66 copolymer filaments are around 1.14 g/cm³ (the value the calculator uses); PA12 filaments are lighter at about 1.01 g/cm³. Carbon- or glass-filled nylons are denser again, so check the datasheet. Every number on this page is computed from PA6 1.14 g/cm³, PA12 1.01 g/cm³; if your spool lists a different density, choose the closest material or scale the result: length is inversely proportional to density, so a material 3% denser gives 3% fewer meters per kilogram.
Length of common Nylon (PA) spool sizes
| Net weight | PA6 1.75 mm | PA6 2.85 mm | PA12 1.75 mm | PA12 2.85 mm |
|---|---|---|---|---|
| 250 g | 91 m | 34 m | 103 m | 39 m |
| 500 g | 182 m | 69 m | 206 m | 78 m |
| 750 g | 274 m | 103 m | 309 m | 116 m |
| 1 kg | 365 m | 138 m | 412 m | 155 m |
| 2 kg | 729 m | 275 m | 823 m | 310 m |
Net weight is the filament only — the empty spool comes on top. Not every brand sells every size in Nylon (PA); the table simply converts the weight on the label.
Nylon (PA) cost per meter and per gram
| Spool price | Per gram | Per m (1.75) | Per m (2.85) | 10 m (1.75) |
|---|---|---|---|---|
| $30.00 / kg | 3.0¢ | 8.2¢ | 21.8¢ | $0.82 |
| $45.00 / kg | 4.5¢ | 12.3¢ | 32.7¢ | $1.23 |
| $60.00 / kg | 6.0¢ | 16.5¢ | 43.6¢ | $1.65 |
| $70.00 / kg | 7.0¢ | 19.2¢ | 50.9¢ | $1.92 |
Material only, for PA6. A full print also pays for electricity, machine wear and failed prints — see 3D printing cost per gram for worked examples, or drop an STL into the Nylon (PA) print cost calculator.
How diameter tolerance changes the length
Filament is sold by weight, so a spool that runs slightly thick holds fewer meters, and one that runs thin holds more. Length scales with 1 ÷ diameter², so small diameter errors matter roughly twice as much in length:
| Tolerance | Diameter | 1 kg is | Length change |
|---|---|---|---|
| 1.75 ± 0.02 mm | 1.73–1.77 mm | 356–373 m | −2.2% / +2.3% |
| 1.75 ± 0.05 mm | 1.70–1.80 mm | 345–386 m | −5.5% / +6.0% |
| 2.85 ± 0.05 mm | 2.80–2.90 mm | 133–142 m | −3.4% / +3.6% |
Good filament is typically specified at ±0.02–0.03 mm and budget filament at ±0.05 mm. Your slicer assumes the nominal diameter, so a consistently thick spool also over-extrudes by the same percentage; if you measure an average diameter well away from nominal, enter it in the slicer's filament settings.
Nylon (PA) compared with other filaments
| Filament | g/cm³ | 1 kg, 1.75 mm | vs Nylon (PA) |
|---|---|---|---|
| PLA | 1.24 | 335 m | −8% |
| PETG | 1.27 | 327 m | −10% |
| ABS | 1.04 | 400 m | +10% |
| TPU | 1.21 | 344 m | −6% |
| ASA | 1.07 | 389 m | +7% |
| Nylon (PA) | 1.14 | 365 m | — |
About Nylon (PA) spools
Nylon is the material where the grade matters most: the same kilogram of 1.75 mm filament is about 13% longer in PA12 than in PA6. The tables on this page show both.
Nylon is strongly hygroscopic — it can absorb several percent of its weight in water from humid air. A wet spool weighs more than the plastic on it, so a weight-based length estimate slightly overstates what is left. Dry nylon before printing and store it sealed with desiccant.
The formula, worked for Nylon (PA)
length = mass ÷ (density × π × (diameter ÷ 2)²)
1,000 g ÷ 1.14 g/cm³ = 877.2 cm³ = 877,193 mm³ of plastic. A 1.75 mm filament has a cross-section of π × 0.875² = 2.405 mm², so the length is 877,193 ÷ 2.405 = 364,694 mm, or 364.7 m. With 2.85 mm filament (6.379 mm²) it is 137.5 m.
Read how much filament a print uses to estimate the grams a model needs, or go back to the filament length calculator for every material.
FAQ
How long is 1 kg of nylon filament?
About 365 m of 1.75 mm Nylon (PA) or 138 m of 2.85 mm filament, at a density of 1.14 g/cm³. For PA12 (1.01 g/cm³) it is about 412 m and 155 m.
How much does 1 meter of nylon filament weigh?
About 2.74 g for 1.75 mm and 7.27 g for 2.85 mm, so 10 m of 1.75 mm Nylon (PA) is about 27.4 g.
How many meters are on a 250 g or 2 kg spool of Nylon (PA)?
A 250 g spool of 1.75 mm Nylon (PA) holds about 91 m; a 2 kg spool about 729 m. In 2.85 mm the same spools hold about 34 m and 275 m.
What does nylon filament cost per meter?
At $45.00 per kg, 1.75 mm Nylon (PA) costs 12.3¢ per meter and 4.5¢ per gram; 2.85 mm costs 32.7¢ per meter.