Injection Moulding Calculators & Selectors
Planning tools built from the same engineering rules in our guides. Every result is an estimate for budgeting and comparison, not a quotation — for a firm number, send us your drawings.
Cooling Time & Cycle Estimator
Estimate cooling time, cycle time, output per hour and cycle cost from wall thickness, material and temperatures, using the standard plate-cooling equation.
Open tool →Mould Cost Estimator
Get a realistic tooling budget range from part size, complexity, cavitation, side actions and mould class, with typical lead-time guidance.
Open tool →Material Selector
Screen plastic families with seven inputs using a simplified model. Results need grade-specific review, not material approval.
Open tool →Tolerance Calculator
Estimate achievable tolerances from nominal dimension, feature type, material shrink class and grade, with indicative ISO 20457 mapping.
Open tool →Clamp Force Calculator
Compute required clamp tonnage and recommended machine size from projected area, cold runner, material pressure class and safety margin.
Open tool →Part Cost Calculator
Break cost per part into material, machine time, mould amortisation and extras — and see how the price moves with volume.
Open tool →Shot Size Calculator
Calculate total shot weight and volume from part volume, material density, runner allowance and cavitation — with the 20–80 % barrel rule and an indicative machine size.
Open tool →Shrinkage Calculator
Convert between part and cavity dimensions using material shrinkage ranges, with glass-fibre anisotropy guidance and a custom shrinkage override.
Open tool →Quote comparison normaliser
Compare 2–3 supplier quotations on one basis: tooling, unit prices, included and unknown charges, with no ranking.
Open tool →RFQ brief builder
Prepare a structured quote request text with drawing revision, material, quantity and acceptance gaps marked.
Open tool →Why we publish these tools
Most moulding cost and cycle questions follow a small set of physics and industry rules of thumb. These calculators make those rules interactive, so you can test design decisions — wall thickness, cavitation, material grade — before requesting a quotation. The formulas and data behind each tool are explained in the linked guides on the tool pages.