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FERMI LAB
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FERMI LAB
Build chains of reasoning to estimate impossible-sounding quantities.
Break the impossible into the possible — one assumption at a time.

A big question appears — seemingly impossible to answer

Break it down into a chain of smaller estimates

Each step gets traffic-light feedback: green, amber, or red

Your chain multiplies out to a final estimate

Scoring rewards your reasoning process, not just the answer

Level
GCSE
Session Length
Top Scores
Score
0
Question
1/5
Greens
0
Score
0
Question
1/5
Greens
0
Chain Calculation
Your Chain vs Model Chain
StepYoursModel
SESSION COMPLETE
0
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