Microsoft has a resource now that will help you calculate your Developer Velocity Index.

This assessment is designed to help you and your organization identify gaps across three key domains: technology, working practices and enablement. It will provide a personalized report showing a detailed outline for how your organization can improve over time to meet the growing needs of your developers and software strategy. You can share this report with your Microsoft Account Representative or Partner of choice and to focus and accelerate your digital transformation journey and improve your business outcomes.

Microsoft – https://developervelocityassessment.com/

You can get started at https://developervelocityassessment.com/

You just want a free report about Developer Velocity, you can get yours at https://azure.microsoft.com/en-us/overview/developer-velocity/