Parts Per Hour Calculator

Calculate injection molding production output from cycle time. This practical tool is an engineering estimate—validate decisions against machine, material, mold, and process data.

Formula and method

Hourly output = 3,600 ÷ cycle time × cavities × planned uptime.

Inputs and units

Enter measured or specified values in the displayed units. Keep units consistent; results are rounded for practical planning. This first release uses the displayed engineering units rather than a unit-switcher.

Worked example

3,600 ÷ 30 s × 4 cavities × 90% uptime = 432 parts/hour.

Use this after the cycle is credible

Convert a stable cycle, cavity count, and planned uptime into a planning output. Track rejects separately with the Scrap Rate Calculator.

What changes the result most

Cycle time, cavities, and realistic uptime. A small cycle-time change compounds over a shift.

Common mistake

Using 100% uptime for a production forecast with planned stops, changeovers, or maintenance.

Interpretation, assumptions, and limitations

This tool provides an estimate for planning and education. It does not replace machine maker limits, material data sheets, mold trials, cavity-pressure data, process validation, or qualified engineering review.

FAQ

Can I use this as a final production setting?

No. Confirm with validated process data and the applicable machine and material documentation.

Why can the real result differ?

Geometry, melt behavior, pressure loss, material lot, temperature, cooling layout, and operating practice can materially affect results.