May 19, 2026
6 min read
Roles and collaboration
Who Should Estimate User Stories?
A practical guide to who should estimate user stories, why estimation works better as a team conversation, and how to avoid turning estimates into top-down guesses.
Start with the simple answer
The people closest to delivering the work should be part of estimating it. In Scrum, that usually means the Developers, with product context available from the Product Owner.
Estimation works best as a team conversation, not as a number handed down from the outside.
Estimation ownership
Story estimates improve when the people closest to the work talk through complexity, risk, and uncertainty together.
Best estimators
The people closest to the work usually see the real complexity and risk.
Implementation detail
Developers can see the technical uncertainty behind the request.
Shared understanding
Estimation improves when the team talks through assumptions together.
Avoid top-down guesses
Outside numbers often hide uncertainty instead of exposing it.
Better estimate
Story estimates work best as a delivery conversation, not a number assigned from the outside.
Why Developers need to estimate
Developers are the people most likely to see the technical complexity, unknowns, dependencies, and implementation tradeoffs that affect effort.
If they are excluded from estimation, the team often gets a number that looks precise but is missing the reality of the work.
What the Product Owner should contribute
The Product Owner usually should not dictate the estimate, but they should absolutely help clarify the problem, the expected outcome, and the reason the work matters.
Good estimation needs product context. The number gets more useful when the team understands what it is actually sizing.
Why estimation should not be a solo act
Solo estimates are fast, but they often hide disagreement and false confidence. Team estimation creates a better chance to surface different assumptions before the sprint starts.
That is why useful estimation is less about who wins and more about what the conversation reveals.
- Different people notice different risks.
- Disagreement often reveals missing context.
- Shared estimates are easier to defend later.
Who usually should not force the number
Stakeholders, managers, or product roles can bring important context, but they should not turn estimation into a top-down commitment exercise.
The moment the estimate becomes a target someone is expected to obey, the conversation gets less honest.
What matters more than attendance alone
Having the right people in the room still does not help much if the story is vague or the team has no shared way to talk about size.
Estimation gets better when the work is clearer and when the team has a lightweight structure for discussing effort, complexity, uncertainty, and risk.
What good estimation feels like
Good estimation usually feels less like negotiation and more like a useful alignment moment. The team may not agree instantly, but people understand why the work feels bigger or smaller.
That shared reasoning is often more valuable than the number itself.
Where to go next
If your team wants estimation to feel less awkward and more useful, planning poker and the estimator are the best next steps.
Use planning poker when the conversation needs a cleaner format, and use the estimator when the team needs a clearer way to explain why a story feels like that size.
TL;DR
- The people closest to delivering the work should help estimate it.
- Developers estimate because they see technical risk, dependencies, and effort realism.
- Product Owners provide context, but should not force the number.
- The best estimates come from the people who will actually deliver the work, not from observers outside the implementation details.