Modified Fibonacci
1 · 2 · 3 · 5 · 8 · 13 · 20 · 40 · 100
Gaps grow as size grows so the team argues less about precision that is not there. Common in planning poker.
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Which estimation scale is this team using?
Three common relative scales. Pick one and stay on it — this page does not map values across scales.
Stand: September 25, 2026 · No account required.
There is no honest conversion between Fibonacci, powers of two, and T-shirt sizes. Changing scale means recalibrating with the team.
Powers of two
1 · 2 · 4 · 8 · 16 · 32
Each step doubles. Useful when the team wants a strict “twice as big” conversation.
T-shirt sizes
XS · S · M · L · XL
Labels without numbers. Good early in discovery when you only need buckets, not a point budget.
Where the numbers come from
Facilitation practice for relative estimation. This page does not convert between scales.
Name your reference stories
Pin 1, 5, and 13 so the next vote has anchors.