Injection Molding Calculator
Injection Molding & Plastic Mold — 7 Core Calculation Formulas, Shared Parameters, Real-Time Interaction
⚡ Linked Parameters · Real-Time Calculation · Visualization
1
Cost Per UnitCPU — Core for Customer Decision-Making
CPU = Material + Machine + Labor + Overhead + Tool Amortization + Secondary + Packaging
📝 Additional Inputs
📊 Results
$0.000
Cost Per Unit
Material–
Machine–
Labor–
Overhead–
Tool Amort.–
Secondary–
Packaging–
Units/Hour–
2
ROI & Break-EvenDirect Basis for Project Investment
Break-Even Qty = Fixed Costs / (Sell Price − Variable Cost per Unit)
ROI (%) = (Net Profit / Total Investment) × 100
Payback Period = Total Investment / Annual Net Profit
ROI (%) = (Net Profit / Total Investment) × 100
Payback Period = Total Investment / Annual Net Profit
📝 Investment & Pricing
📊 Results
0
Break-Even Quantity (pcs)
Total Fixed Cost–
Variable Cost/pc–
Margin/pc–
Annual Profit–
ROI–
Payback–
💡 Sensitivity Analysis: Unit cost and ROI at different production volumes
| Volume | Mold Amort. | CPU | Margin | ROI |
|---|
3
Cycle TimeAffects Lead Time and Capacity Commitment
Cycle Time = t_fill + t_pack + t_cooling + t_open/close + t_eject
Cooling Time ≈ (h² / π²α) × ln(C × (T_melt − T_mold) / (T_eject − T_mold))
Cooling Time ≈ (h² / π²α) × ln(C × (T_melt − T_mold) / (T_eject − T_mold))
📝 Cycle Parameters
📌 Note: Cooling time auto-calculated from wall thickness & material.
📊 Results
0.0 s
Total Cycle Time
Fill Time–
Pack Time–
Cooling Time–
Open/Close–
Eject–
Cooling %–
Parts/Hour–
4
Clamping ForceBasis for Machine Selection and Quotation
Method 1: F (TON) = Am × Pv / 1000
Method 2: F (TON) = Kp × Projected Area (cm²) × Safety Factor
Method 2: F (TON) = Kp × Projected Area (cm²) × Safety Factor
Kp Material Reference (tons/cm²): Click to select material
PP
0.30–0.45
PE
0.25–0.35
ABS
0.35–0.50
PC
0.55–0.70
PA6
0.45–0.60
POM
0.45–0.65
PEEK
0.60–0.80
📝 Clamping Parameters
📊 Results
0 TON
Required Clamping Force (Method 1)
Method 2 (Kp)–
Total Proj. Area–
L/t Ratio–
Recommended Machine–
5
Shrinkage RateAffects Dimensional Accuracy and Mold Design
Shrinkage: S(%) = (Dm − Dp) / Dm × 100
Mold Dimension: Dm = Dp × (1 + S% / 100)
Mold Dimension: Dm = Dp × (1 + S% / 100)
📝 Dimension Inputs
📌 Shrinkage defaults to the material selected in Shared Parameters. You can also override it manually.
PP
1.0–2.5%
PE
1.5–4.0%
ABS
0.4–0.9%
PC
0.5–0.7%
PA6
0.7–2.0%
POM
1.8–3.0%
📊 Results
0.000 mm
Required Mold Dimension
Shrinkage Used–
Shrinkage Amount–
Compensated Dim–
6
Optimal Cavity CountTrade-off Between Mold Cost and Unit Cost
Required Cavities = Annual Demand / (Available Hours × 3600 / Cycle Time)
As cavities ↑: Mold Cost ↑ but CPU ↓ → Find the optimal point
As cavities ↑: Mold Cost ↑ but CPU ↓ → Find the optimal point
📝 Production Planning
📊 Results
1
Minimum Cavities Required
💡 Cavity Trade-off Analysis
| Cavities | Mold Cost($) | Parts/Hr | CPU($) | Total Cost($) |
|---|
7
Energy & Material UtilizationESG and Sustainability Trend
Energy Cost/part = (kW × Cycle Time(hr) × $/kWh) / Cavities
Material Utilization = Part Weight / (Part Wt + Runner Wt + Scrap) × 100%
Material Utilization = Part Weight / (Part Wt + Runner Wt + Scrap) × 100%
📝 Energy Parameters
📊 Results
$0.000
Energy Cost per Part
kWh per Part–
Material Utilization–
Waste per Part–
Material Flow
