TPU length by spool size
TPU is flexible and similar in density to PLA, so lengths are close to PLA’s. These figures use a typical density of 1.21 g/cm³.
| Net weight | Metres (1.75 mm) | Metres (2.85 mm) | Feet (1.75 mm) |
|---|---|---|---|
| 250 g | 85.9 | 32.4 | 282 |
| 500 g | 171.8 | 64.8 | 564 |
| 750 g | 257.7 | 97.2 | 845 |
| 1 kg | 343.6 | 129.5 | 1,127 |
| 2 kg | 687.2 | 259.1 | 2,255 |
| 3 kg | 1,030.8 | 388.6 | 3,382 |
How it is calculated
One metre of 1.75 mm filament is a cylinder with a volume of 2.405 cm³. At 1.21 g/cm³ that weighs 2.91 g, so 1000 g ÷ 2.91 g = 344 m.
Length (m) = weight (g) ÷ (π × (diameter ÷ 2)² × density)
What that means in practice
- A 1 kg spool of TPU is enough for roughly 40–60 average-sized prints of 15–25 g each.
- Typical nozzle temperature for TPU: 210–235 °C. See the temperature chart.
- TPU absorbs moisture quickly; keep it sealed and dry it before long prints.
- The weight on the label is the filament only. The empty spool adds another 150–250 g for plastic spools.
Frequently asked questions
How much does 1 metre of TPU weigh?
About 2.91 g for 1.75 mm and 7.72 g for 2.85 mm.
How many metres are on a 500 g spool of TPU?
About 172 m of 1.75 mm filament.
Is there enough TPU left for my print?
Weigh the spool, subtract the empty spool weight, and enter the remaining grams in the converter above. Compare it with the length your slicer reports, and keep a few metres spare.
Last reviewed October 2026. See how we calculate.