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RCPCHGrowth library

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The calculation functions within the Digital Growth Charts API are powered by a self-contained Python package which has been extracted out into a separate repository and is published on PyPi, the Python Package Index. This enables the centile calculation functions to be used in other programs.


GitHub Repository

PyPi Package


To add rcpchgrowth to your project, install via pip

pip install rcpchgrowth


We have taken the slightly unusual step of licensing the python package under the GNU Affero General Public License version 3, which may restrict commercial reuse models. We've done this because all of the 'heavy lifting' of the API server depends on this package, and we wanted to protect it from 'unofficial' commercial competing APIs, at least until the model of Royal College-delivered APIs is established and secure.

Helpful licensing

If this licensing issue restricts your valid, patient-benefiting, non-profit use-case, then please do reach out to us and we will consider dual-license options or some other arrangement that helps you.


We'd be interested to hear from people who are using the RCPCHGrowth python package, so we can learn more about the use-cases and how we might continue to improve the package. Please do create issues on our GitHub repo, or discuss the package in the dGC Forums


If you want to contribute to the project, please read the section on Contributing.