Nozzle Flow Rate Calculator
Calculate the volumetric flow rate through your 3D printer nozzle based on nozzle diameter, layer height, and print speed.
Flow Rate
Volumetric flow rate determines how much plastic your hotend must melt per second.
Flow Rate (mm³/s) = Nozzle Diameter × Layer Height × Print Speed
This is the extrusion width × layer height × speed approach. If your hotend cannot melt filament fast enough, you get under-extrusion.
Max flow rates by hotend type:
- Standard (PTFE-lined): ~10-15 mm³/s
- All-metal: ~15-20 mm³/s
- High-flow (Volcano, CHT): ~25-40 mm³/s
- Bambu/high-speed: ~30-50 mm³/s
Common nozzle sizes:
- 0.2mm: Fine detail work
- 0.4mm: Standard (most common)
- 0.6mm: Faster prints, less detail
- 0.8mm: Rapid prototyping