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PlasticsCalc
Practical injection molding calculators for engineers
PlasticsCalc brings 33 practical injection molding calculators into one free browser-based resource. It covers machine sizing, shot capacity, cooling and cycle planning, runners and sprues, material use, scrap, regrind, production output, OEE, machine cost, and tooling economics. Each tool includes formulas, assumptions, worked examples, result guidance, and limitations for safer first-pass engineering estimates.
I built PlasticsCalc because injection molding calculations are often scattered across spreadsheets, reference books, equipment documentation, and isolated online tools.
The goal was to create one practical, browser-based resource for first-pass engineering estimates. PlasticsCalc currently includes 33 calculators covering machine sizing, material usage, cooling and cycle planning, production capacity, process efficiency, costing, and tooling economics.
Each calculator shows its formula, assumptions, worked example, result interpretation, and limitations. The results are designed to support early planning and comparison, not replace material datasheets, machine specifications, mold validation, or production trials.
I would especially appreciate feedback from molders, engineers, technicians, and manufacturing teams about calculation errors, unclear assumptions, or useful tools that may be missing.
About PlasticsCalc on Product Hunt
“Practical injection molding calculators for engineers”
PlasticsCalc was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #91 on the daily leaderboard. PlasticsCalc brings 33 practical injection molding calculators into one free browser-based resource. It covers machine sizing, shot capacity, cooling and cycle planning, runners and sprues, material use, scrap, regrind, production output, OEE, machine cost, and tooling economics. Each tool includes formulas, assumptions, worked examples, result guidance, and limitations for safer first-pass engineering estimates.
On the analytics side, PlasticsCalc competes within Productivity and Software Engineering — topics that collectively have 700.5k followers on Product Hunt. The dashboard above tracks how PlasticsCalc performed against the three products that launched closest to it on the same day.
Who hunted PlasticsCalc?
PlasticsCalc was hunted by canghun. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of PlasticsCalc including community comment highlights and product details, visit the product overview.
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