There are 333 meters in 1kg of standard 1.75mm PLA filament (varies by diameter).
A 1kg spool of 3D printing filament typically contains 200-400 meters, depending on diameter and material density. For 1.75mm PLA, expect ~333m; 2.85mm PLA yields ~125m. Filament length is calculated using volume, density, and cross-sectional area.
How Filament Length Is Calculated
- Formula: Length (m) = (1,000g / density) / (π × radius²)
- Key variables:
- Filament diameter (1.75mm or 2.85mm most common)
- Material density (PLA: ~1.24g/cm³; PETG: ~1.27g/cm³; ABS: ~1.04g/cm³)
- Note: Tolerances (±0.05mm) and spool packing affect actual length.
Meters per Kilogram by Filament Type
| Material | Diameter (mm) | Density (g/cm³) | Meters in 1kg |
|---|---|---|---|
| PLA | 1.75 | 1.24 | ~333m |
| PLA | 2.85 | 1.24 | ~125m |
| PETG | 1.75 | 1.27 | ~328m |
| ABS | 1.75 | 1.04 | ~400m |
| TPU (Flexible) | 1.75 | 1.21 | ~344m |
How to Verify Your Filament Length
- Weigh the spool: Subtract empty spool weight from total.
- Measure diameter: Use calipers (3 points along filament).
- Check density: Refer to manufacturer specs (varies by brand).
- Use a calculator: Input values into a filament length calculator.
Factors That Reduce Usable Filament
- Spool tangles: Knots or overlaps waste 5-20m per spool.
- Moisture absorption: Degrades material, requiring trimming.
- End-of-spool thinning: Diameter may vary near the core.
- Print failures: Failed prints consume filament without output.
Quick Conversion Cheat Sheet
- 1.75mm PLA: 1kg ≈ 333m | 0.5kg ≈ 166m | 0.25kg ≈ 83m
- 2.85mm PLA: 1kg ≈ 125m | 0.5kg ≈ 62m | 0.25kg ≈ 31m
- ABS (1.75mm): 1kg ≈ 400m (lightest common filament)