What this calculator does
The Injection Mold Cost Calculator gives a rough early-stage estimate for plastic injection mold tooling. It is useful before you send files to multiple mold makers, before you compare prototype tooling with production tooling, or before you decide whether an idea can support the upfront cost of a mold.
Injection mold pricing is not a universal formula. A supplier needs a 3D model, 2D drawing, material, tolerance, surface finish, gate preference, expected tool life, production volume, and quality requirements before giving a real quote. This calculator converts common tooling cost drivers into a planning range so you can ask better questions.
Quick answers
How the estimate works
The calculator intentionally gives a range, not a single exact number. Early estimates should include uncertainty because design changes often occur after DFM feedback.
| Cost driver | Why it changes the quote |
|---|---|
| Cavity count | More cavities can reduce unit cost but increase mold cost and balancing complexity. |
| Slides and lifters | Undercuts require moving components, adding machining, fitting and maintenance complexity. |
| Steel grade | Prototype tools may be cheaper; hardened production steel costs more but lasts longer. |
| Hot runner | Can reduce waste and improve cycle economics, but raises initial tooling cost. |
| Surface finish | Cosmetic or high-polish requirements require extra labor and quality control. |
When this calculator is useful
- Checking if a product idea can support injection-mold tooling.
- Comparing a one-cavity prototype tool with a multi-cavity production tool.
- Estimating how mold cost affects per-part cost at different production volumes.
- Preparing a more complete RFQ for suppliers.
- Understanding why one supplier quote is far higher than another.
RFQ checklist
- 3D CAD file and 2D drawing with critical dimensions.
- Resin/material grade, color, shrinkage and additives.
- Expected annual volume and total tool life.
- Cosmetic surfaces, texture, polish and gate restrictions.
- Allowed parting line, ejector marks and sink marks.
- Testing, sampling, inspection and packaging requirements.
Example
A medium-sized enclosure with moderate ribs, two cavities, one slide, P20 steel, cosmetic finish and a hot runner can be several times more expensive than a simple open-shut prototype mold. At 50,000 pieces, the tooling cost per part may be acceptable; at 2,000 pieces, it may dominate the economics.