Injection Molding Cycle Time
Estimate total cycle time from part geometry and material thermal properties.
Inputs
Material Selection
Auto-fills thermal diffusivity, melt/mold temperature and heat-deflection temperature.
Part & Machine
Shot weight of the part.
Thickest wall section of the part.
Results
Mold Open/Close Time (T₀)
4.90s
Machine dry-cycle time, scaled by clamping force.
Injection Time (Tᵢ)
0.93s
Fill time, scaled by shot weight.
Holding Time (Tₕ)
3.00s
Pack/hold time, scaled by wall thickness.
Cooling Time (Tᶜ)
6.41s
Heat-diffusion cooling time from material properties.
Total Cycle Time
15.24s
Sum of all four phases.
Material — Reference Values
| Material | hdt | alpha | melt_temp | mold_temp |
|---|---|---|---|---|
| ABS | 85 | 0.08 | 220 | 45 |
| HIPS | 85 | 0.08 | 220 | 45 |
| PS | 85 | 0.08 | 220 | 55 |
| PP | 85 | 0.065 | 230 | 37.5 |
| HDPE | 50 | 0.09 | 225 | 32.5 |
| LDPE | 50 | 0.09 | 225 | 32.5 |
| PMMA | 90 | 0.075 | 220 | 55 |
| POM | 115 | 0.06 | 220 | 57.5 |
| PA6 | 130 | 0.07 | 237.5 | 90 |
| PA66 | 150 | 0.085 | 282.5 | 90 |
| PBT | 150 | 0.09 | 245 | 100 |
| PET | 150 | 0.09 | 275 | 100 |
| PC | 130 | 0.105 | 290 | 85 |
| PC-ABS | 110 | 0.095 | 250 | 65 |
About This Calculator
Estimates the injection molding cycle time as the sum of four phases: • Mold open/close time (T₀) — machine dry-cycle, scaled by clamping force. • Injection time (Tᵢ) — fill time, scaled by shot weight. • Holding time (Tₕ) — pack/hold, scaled by wall thickness. • Cooling time (Tᶜ) — heat-diffusion time from the selected material's thermal diffusivity, melt/mold temperature and heat-deflection temperature. These are theoretical values; actual cycle times vary with part geometry, gate design, material grade and machine conditions.