Promises (representing the result of a single asynchronous operation) and Observables (representing an ongoing stream of emitted values) aren't really equivalent. I know you can create an Observable from a Promise, which will emit a single value when that promise is fulfilled and then be marked as completed or closed - but this is more for integration - such as being able to combine inputs from single-shot async calls into broader observable operations. If your Promises are discrete async calls, I'm curious why you would want to convert them?