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Scrum Timebox Calculator

Free tool
EventMax time
Sprint Planning4 hr
Daily Scrum15 min
Sprint Review2 hr
Sprint Retrospective1.5 hr
  • Sprint Planning: Scrum Guide maximum for a one-month Sprint is 8 hours - shorter Sprints are usually shorter, scaled here proportionally.
  • Daily Scrum: Fixed at 15 minutes regardless of Sprint length - it is a daily event, not one that scales with the Sprint.
  • Sprint Review: Scrum Guide maximum for a one-month Sprint is 4 hours, scaled here proportionally for shorter Sprints.
  • Sprint Retrospective: Scrum Guide maximum for a one-month Sprint is 3 hours, scaled here proportionally for shorter Sprints.

Where these numbers come from

The Scrum Guide states maximum timeboxes for a one-month Sprint: 8 hours for Sprint Planning, 4 hours for Sprint Review, and 3 hours for Sprint Retrospective. The Daily Scrum is fixed at 15 minutes regardless of Sprint length - it's a daily event, not one that scales.

Why shorter sprints get shorter timeboxes

The Scrum Guide states that these events are "usually shorter" for shorter Sprints but doesn't define an exact formula - this calculator applies simple proportional scaling (a one-week Sprint gets roughly a quarter of a one-month Sprint's Planning time) as a reasonable default, not an official rule.

Using this as a ceiling, not a target

These are maximums, not required durations - a well-refined backlog and an experienced team often need less time than the ceiling allows. Treat a Sprint Planning session that runs the full timebox every single Sprint as a signal worth investigating, not a badge of thoroughness.

Frequently asked questions

The Scrum Guide, which states maximums for a one-month Sprint: 8 hours for Sprint Planning, 4 hours for Sprint Review, 3 hours for Sprint Retrospective, and a fixed 15 minutes for the Daily Scrum.
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