Why Planning Poker Uses Fibonacci Numbers

Planning poker decks often use Fibonacci-like values because larger work carries more uncertainty. The widening gaps encourage teams to discuss whether a story should be split instead of arguing over false precision.

Updated 2026-09-20 · Free, no account required

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The common deck

A lightweight deck uses 1, 2, 3, 5, 8, 13, and 21. Some teams add 0 for no effort, a question mark for uncertainty, or a coffee card to request a break.

Numbers describe relative effort

A 5 is not five hours and a 13 is not thirteen days. The values compare stories within the same product and team. Calibrate with a few familiar reference stories before estimating new work.

When a card is too large

A 21 often signals that the story contains several jobs or unknowns. Split the work, clarify the acceptance criteria, or run a short discovery task before estimating it again.

Frequently asked questions

Should every team use Fibonacci?

No. Fibonacci is a useful convention, but a team may use another relative scale if everyone understands its meaning and uses it consistently.

Should estimates be converted to hours?

Avoid converting story points directly to hours. Track completed work over time if you need a planning forecast, and keep points as a relative measure.