The Feynman Technique: How to Learn Anything in 4 Steps

You've read the chapter twice. The highlights are neat. It all feels clear — until the exam asks you to explain it, and the words don't come. That feeling of knowing without really knowing is the problem the Feynman Technique solves. It takes 20–40 minutes per concept, needs only a blank page, and works for any subject: physics, economics, biology, law or code.

What is the Feynman Technique?

The Feynman Technique is a study method in which you learn a concept by teaching it in the simplest possible words. If you can't explain it simply, you've found exactly what you still need to learn.

It's named after Richard Feynman, the American physicist who shared the 1965 Nobel Prize in Physics for work on quantum electrodynamics and was famous for making hard ideas sound obvious. Feynman never published a "four-step technique" himself — the name is a modern summary of how he worked. According to James Gleick's biography Genius, as a student he kept a notebook titled "Notebook of things I don't know about", where he took topics apart and rebuilt them in his own words. That habit is the heart of the method.

The 4 steps of the Feynman Technique

1. Pick a topic and write what you already know. Write the concept at the top of a blank page — "How vaccines work", "Opportunity cost", "Recursion". Then, without your notes, write down everything you can remember. This is a quick active recall warm-up and shows your starting point.
2. Explain it to a 12-year-old. Write (or say out loud) an explanation a curious 12-year-old could follow. Short sentences. Everyday words. A concrete example. If you use a technical term, you must explain it too. Jargon is often where misunderstanding hides.
3. Find the gaps and go back to the source. Underline every spot where you got stuck, used a word you couldn't define, skipped a step, or wrote "basically" and moved on. Now open your textbook or lecture notes — but read only to fix those gaps. Then explain that part again.
4. Simplify and add an analogy. Rewrite the whole explanation shorter and clearer. Add one analogy ("voltage is like water pressure in a pipe"). Finally, test it: explain it out loud without notes, or answer two or three exam questions on it.

A worked example: photosynthesis

First attempt (textbook words): "Photosynthesis is the process by which autotrophs convert light energy into chemical energy via the light-dependent reactions and the Calvin cycle in the chloroplasts."

It sounds right — but it's mostly copied vocabulary. Could you explain "light-dependent reactions" or what the Calvin cycle actually does? If not, that's the gap.

Simple version (step 2): "Plants make their own food. Their leaves catch sunlight. They use that energy to join water from the soil with carbon dioxide from the air, and this makes sugar. Oxygen is left over, so the plant lets it out into the air."

Gap found (step 3): "use that energy to join…" — how is sunlight's energy stored before it's used? Back to the textbook: the light reactions split water and store energy in two carrier molecules, ATP and NADPH; the Calvin cycle then spends that energy to build sugar from carbon dioxide.

Final version with analogy (step 4): "A leaf works like a tiny solar-powered factory. First, sunlight charges up 'batteries' (ATP and NADPH) — this step splits water and releases oxygen. Then, in a second step called the Calvin cycle, the factory spends those charged batteries to build sugar out of carbon dioxide from the air."

Notice the final version is still simple, but now every technical term has a job. That's the difference between memorising and understanding.

Free Feynman explanation checker

The reading grade uses the standard Flesch–Kincaid formula: 0.39 × (words ÷ sentences) + 11.8 × (syllables ÷ words) − 15.59. Aim for grade 8 or below in step 2. It's a rough guide — a simple-sounding explanation can still be wrong, so always check your facts against the source in step 3.

Does the Feynman Technique work? What the research says

No study has tested "the Feynman Technique" by name. But each of its ingredients has been studied, and the evidence is encouraging:

Using ChatGPT or Gemini as your "12-year-old"

Don't have a 12-year-old (or a patient roommate) to explain things to? An AI chatbot can play the listener — as long as you write the explanation yourself. If the AI writes it, you skip the part that makes you learn. Copy this prompt:

When it finds a gap, go to your textbook or lecture slides to fix it — not to the chatbot. AI can state wrong facts confidently. For 30 more copy-paste prompts for studying, see our guide to the best ChatGPT prompts for students.

5 common Feynman Technique mistakes

• Only thinking the explanation. It has to be written or spoken. In your head, gaps are easy to skip over.
• Peeking at notes in step 2. You'll end up copying, not explaining. Close the book first.
• Re-reading the whole chapter in step 3. Go back only for the specific gaps you marked. That's what makes it fast.
• Simplifying until it's wrong. "Electricity is like water" helps — until you treat it as exactly true. Note where your analogy breaks down.
• Using it for everything. It's best for concepts and processes. For lists, dates and vocabulary, flashcards are faster.

Preparing for a viva or presentation? The Feynman Technique is ideal practice — see how to prepare for an oral exam. For turning lectures into material you can explain, try the Cornell note-taking method.

Frequently asked questions

What is the Feynman Technique?

A study method named after physicist Richard Feynman: you learn a topic by explaining it in simple words as if to a 12-year-old, finding where your explanation breaks down, going back to the source to fix those gaps and simplifying again.

What are the 4 steps of the Feynman Technique?

1) Pick a topic and write what you know. 2) Explain it in plain language. 3) Find the gaps and go back to the source. 4) Simplify, add an analogy and test yourself out loud.

Does the Feynman Technique actually work?

It hasn't been tested by name, but its parts are well supported: self-explanation improves understanding (Chi et al., 1994), and preparing to teach and teaching improve recall (Nestojko et al., 2014; Fiorella & Mayer, 2013). Pair it with active recall and spaced repetition.

Did Richard Feynman invent the Feynman Technique?

Not as a formal four-step method. The steps are a modern summary of how he learned and taught — including a notebook he titled "Notebook of things I don't know about", described in James Gleick's biography Genius.

Can I use ChatGPT for the Feynman Technique?

Yes — as the listener. Write the explanation yourself, then ask the AI to act as a curious 12-year-old that asks follow-up questions and flags jargon without giving answers. Check facts against your textbook.

How long does the Feynman Technique take?

About 20–40 minutes per concept. Save it for the hardest ideas and those most likely to be examined.

Sources

• Chi, M. T. H., De Leeuw, N., Chiu, M.-H., & LaVancher, C. (1994). Eliciting self-explanations improves understanding. Cognitive Science, 18(3), 439–477.
• Rozenblit, L., & Keil, F. (2002). The misunderstood limits of folk science: an illusion of explanatory depth. Cognitive Science, 26(5), 521–562.
• Nestojko, J. F., Bui, D. C., Kornell, N., & Bjork, E. L. (2014). Expecting to teach enhances learning and organization of knowledge in free recall of text passages. Memory & Cognition, 42(7), 1038–1048.
• Fiorella, L., & Mayer, R. E. (2013). The relative benefits of learning by teaching and teaching expectancy. Contemporary Educational Psychology, 38(4), 281–288.
• Dunlosky, J., Rawson, K. A., Marsh, E. J., Nathan, M. J., & Willingham, D. T. (2013). Improving students' learning with effective learning techniques. Psychological Science in the Public Interest, 14(1), 4–58.
• Gleick, J. (1992). Genius: The Life and Science of Richard Feynman. Pantheon Books.
• Kincaid, J. P., Fishburne, R. P., Rogers, R. L., & Chissom, B. S. (1975). Derivation of new readability formulas for Navy enlisted personnel. Naval Technical Training Command.