Rough Order of Magnitude (ROM) Estimate and How to Calculate It (with example)
Rebel’s Guide to PM
MARCH 14, 2021
What is a ROM estimate used for? A rough order of magnitude estimate is used to give you a very high level view of potential project costs. Ideally, you’d be able to provide a definitive estimate, carefully created from loads of input from subject matter experts and plenty of research on past projects and their budgets.