thinQmaster Virtual testing partner Adaptive practice exams that find your weak spots and drill them. Every answer explained. From $69
Enroll

thinQmaster

Find your exam

Five questions free, before you decide.

Step 1 · choose a vendor

In one of our camps? Your practice exams come with the tuition — they are on your study page already.

Project Management & Agile · Foundational

Rough Order of Magnitude Estimate (ROM)

An early, low-accuracy estimate typically in the range of -25% to +75%.

Definition

ROM estimates are used during initiation when little detail is available and are refined to budget and definitive estimates through progressive elaboration.

Example

A ROM of $1M means the actual cost is expected between $750k and $1.75M.

Exam tip

Know PMI ranges: ROM -25%/+75%, definitive -5%/+10%.

Related terms