What is another word for do off the top of your head?
Pronunciation: [dˈuː ˈɒf ðə tˈɒp ɒv jɔː hˈɛd] (IPA) 
When it comes to synonyms for "do off the top of your head," there are a few options available. Some possible alternatives include: improvise, wing it, ad-lib, make it up as you go, think on your feet, brainstorm, freestyle, go with the flow, shoot from the hip, and play it by ear. Each of these phrases conveys a similar idea: that you are making decisions or taking action without a clear plan or specific direction. Whether you are trying to come up with a creative solution to a problem or simply need to make a quick decision, these synonyms can help you describe the way you are thinking and acting in the moment.
