Manufacturing calculator category

Injection Molding & Plastics Processing calculators

Estimate molding cycle time, clamp tonnage, shot and runner weight, resin cost, drying needs, cooling load, mold changeovers, and molded-part economics.

What this hub covers

  • Cycle time, clamp tonnage, shot size, resin use, regrind, drying, cooling, mold changeover, and molded-part cost tools.
  • Browse injection molding & plastics processing calculators for manufacturing planning, quoting, quality, capacity, and operations decisions.

Best calculators in this category

  • Injection Molding Cycle Time: Estimate total injection molding cycle time from shot count, press cycling rate, and non-productive time allowance.
  • Clamp Tonnage: Calculate required clamp force from projected part area, average cavity pressure, and a safety factor for flash prevention.
  • Shot Size: Calculate total shot size from part weight, runner weight, number of cavities, and an overfill safety factor.
  • Cushion Percentage: Calculate the screw cushion as a percentage of total shot size to verify consistent pack pressure transfer.
  • Plastic Part Weight: Estimate part weight from CAD volume and resin density for shot sizing and cost estimating before mold trials.
  • Runner Weight: Estimate cold runner system weight from runner volume, resin density, and a geometry factor for sprue and sub-runners.
  • Mold Cavitation: Determine the optimal number of mold cavities from annual demand, available press cycle time, and production hours.
  • Mold Parts Per Hour: Calculate parts per hour output from cycle time and mold cavitation to plan production capacity and press scheduling.
  • Resin Cost Per Part: Calculate material cost per molded part from part weight, runner scrap allocation, and resin price per kilogram.
  • Regrind Percentage: Calculate the regrind content as a percentage of total shot weight to stay within resin supplier and quality limits.
  • Plastic Regrind Savings: Estimate annual material cost savings from using regrind instead of 100% virgin resin in injection molding production.
  • Scrap Resin Cost: Calculate the annual cost of scrapped resin from rejects, purging, startup waste, and non-recoverable material.

Common manufacturing problems solved

  • injection molding
  • plastic processing
  • clamp tonnage
  • shot size
  • resin cost
  • mold cavitation

Category questions

  • What plastics processes does this category support? It focuses on injection molding production planning, including shot size, cavitation, resin consumption, drying, cooling, changeover, and cost estimates.
  • Are the molding calculators final process settings? No. Use them to estimate and compare scenarios, then validate process windows with molding trials, resin data, mold design limits, and quality results.

Last reviewed 2026-05-12.