Serving the UK & IE plastics industry

Mould Gate Size Calculator

Please fill out the boxes below & click the calculate button


Cavity volume 0
Polymers' maximum shear rate 0
Calculated shear rate for round gates 0
Calculated shear rate for square & rectangular gates 0

If the result calculated shear rates are red, then the shear rate limit has been exceeded. You will need to use a slower fill time or bigger gates.

Need help with your tooling? - visit our Moulds & Toolmaking section to talk to the UK & Irelands leading suppliers.

Calculator Disclaimer

Polybridge Training has kindly provided this calculator for the exclusive use of PlastikCity users.

The calculator is provided “as is” and without any representation or warranty of any kind, including that it is fit for any purpose or of merchantable quality or functions as intended or at all. Your use of the calculator is entirely at your own risk, and neither PlastikCity nor Polybridge Training accepts liability of any kind.

Polybridge Training, a UK company, has a worldwide reputation for delivering injection moulding training and technical support. They provide scheduled and customer-specific training courses in the UK, Ireland, Europe and Asia. Scheduled courses take place in the UK, covering process-related product & mould design issues. Email Dave Jeavons at to discuss your training requirements.

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