Get involved

The Global Calculator team have made the tool free and open-source so that you can use it however you like. You are welcome to design your own pathway and share it (click "share" at the top of the online tool to get your unique URL), present it to others, use it in courses, or even make your own version by downloading the Excel model and source code.  

We also welcome feedback on the model. It was built using feedback from hundreds of experts, and we want it to continue to improve. If you find a bug or think our assumptions should change please do contact us by emailing

Presenting the Global Calculator

You are welcome to present the Calculator to your colleagues, students or at conferences. We have already heard that it is being used in university courses around the world.