Estimate injection molding throughput from the operating inputs that matter on the shop floor. This calculator keeps the time basis and output definition visible, then reports the main result with supporting capacity or loss measures. Use it for production planning, shift reviews, and quick what-if checks—not as a substitute for validated machine data or process qualification.
Good output = (scheduled minutes × 60 × (1 − downtime) ÷ cycle seconds) × parts per cycle × (1 − scrap rate).
The main result translates the entered injection molding operating conditions into a planning measure. Read it together with the supporting figures so a change in speed is not confused with a change in availability, quality, batch size, or demand.
Planning estimate only. Validate time studies, counts, and quality definitions against your production records before committing labor, tooling, or delivery dates.
With 480 scheduled minutes, a 45-second cycle, 1 part per cycle, 10% downtime, and 2% scrap, expected good output is 564 parts (about 70.6 parts per scheduled hour).
Use one consistent period—such as a shift, day, or production order—for every time, count, and demand input.
Include changeovers as lost available time or as part of the measured cycle only if that matches the planning definition used throughout the calculation.
Count rejects in total production where requested, but use good units for demand coverage and saleable output.
Yes, but calculate each product separately when cycle time, cavity count, batch size, or quality performance differs materially.
Machine displays may exclude setup, planned stops, downstream work, scrap, or idle time. Match definitions and measurement boundaries before comparing values.
| Variable | Meaning |
|---|---|
| Cycle time | Seconds per completed production cycle |
| Downtime | Scheduled time not running |
| Scrap | Produced pieces that are not accepted |