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I Ching

Coin Casting Method: Six Tosses, One Hexagram

The three-coin method step by step, the exact probabilities behind each line type, how to phrase a question the hexagram can answer, and where the method stops.

2026-02-26 · Updated 2026-10-21

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Responsible editor Chen Jun · BaZi and Chinese metaphysics guides

Member of the BaZi Report editorial team. Responsible for reviewing the BaZi, Zi Wei Dou Shu, name-analysis, date-selection, I Ching and annual-sign guides: checking terminology against the cited classical sources, verifying worked calculations against the site calculators, and keeping claims within the stated limits.

Three coins, six tosses, four possible line values. The randomness is the mechanism rather than a flaw, and the method cannot produce a more accurate hexagram.

Three coins and a fixed set of odds

The three-coin method is the most popular way to consult the I Ching. It involves tossing three coins six times to generate a hexagram. Each toss produces one line, from bottom to top. The method is simple, requires only three coins, and takes about five minutes. It is a randomisation method — it generates a hexagram by chance, not by supernatural communication.

What the coins produce is a number between six and nine, six times over, with known odds. Everything after that is reading. The method never pretends otherwise: no spirit is consulted and no signal is received — the figure you get is the one the arithmetic gives you.

How to cast a hexagram with three coins

Here is the step-by-step process:

StepActionDetails
1. Formulate your questionAsk a clear, open-ended question about a situation you are facingDo not ask yes/no questions. Ask 'What should I consider about...' or 'What is the situation with...' A good question is specific but open. Bad: 'Will I get the job?' Good: 'What should I consider about the job opportunity at Company X?'
2. Prepare three coinsUse three identical coins. Any coins will workChinese coins with a square hole are traditional, but any coins are fine. Assign heads = yang (value 3) and tails = yin (value 2). Consistency matters — always use the same heads/tails assignment
3. Toss the coins six timesToss all three coins at once. Record the result after each toss. Build the hexagram from bottom to topThe first toss is the bottom line (line 1). The sixth toss is the top line (line 6). Record each toss before tossing again
4. Determine the line typeCount the total value: 3 heads = 9 (changing yang, —o—), 3 tails = 6 (changing yin, - -x- -), 2 heads + 1 tail = 8 (stable yin, - -), 2 tails + 1 head = 7 (stable yang, —)The values: 6 = old yin (changing), 7 = young yang (stable), 8 = young yin (stable), 9 = old yang (changing). Only 6 and 9 are changing lines
5. Identify the hexagramFind the hexagram in a reference tableLook up the hexagram by its trigrams. The lower three lines form the lower trigram. The upper three lines form the upper trigram. Each trigram has a number (1-8) that you can use to find the hexagram
6. Read the interpretationRead the judgment, the changing lines (if any), and the relating hexagram (if there are changing lines)If there are no changing lines, read only the judgment. If there is one changing line, read that line text. If there are multiple changing lines, read the judgment of the relating hexagram. The relating hexagram is formed by changing all changing lines to their opposite
Six numbered steps from formulating a question to reading the hexagram, using the three-coin method.
Six tosses build one figure from the bottom up. The order is fixed, and the sixth toss is the top line, not the first.

How to ask a question the hexagram can answer

The quality of a consultation depends more on the question than on the method. A good question is specific, open and situated. What should I consider about the offer from Company X is specific, open, and situated in a real decision. Will I get the job is none of the three, because it asks the text to produce a forecast it was not designed to produce.

Ask one question per cast. The hexagram is a response to whatever was in your mind when you threw the coins. Hold two questions at once and you will not know which one the figure is addressing, or whether it is addressing either. If you have several questions, cast several times with a gap between them, and write each question down before you start.

Do not recast because you dislike the answer. The hexagram is a prompt for reflection, not a quotation you can shop around for. If you resist the perspective it offers, that resistance is itself information, often more useful than the reading. Before casting again, write a sentence explaining why you disagree with the first reading. Disagreement usually reveals more than agreement does.

Why randomness works: the psychology of structured reflection

The three-coin method generates a hexagram by chance, and the probabilities are fixed. Three heads, a changing yang line, comes up one time in eight; three tails, a changing yin line, one time in eight; the two stable lines take three eighths each. Per line that makes yang and yin equally likely, so all sixty-four hexagrams are equally likely at one in sixty-four, while the changing pattern is independent with a one-in-four chance at each of the six positions. A cast averages one and a half changing lines.

The randomness is not a flaw in the method; it is the mechanism. When you put a real question to a random figure, you are forced to connect two unrelated things: your situation and a text written three thousand years ago. The mental effort of building that connection is where the insight comes from. You are not decoding the will of the universe; you are using a structured prompt to think harder than you would have thought unaided.

This is also why the method matters less than the frame of mind. Coins, yarrow stalks or a number generator all end in the same reflective moment. What the physical procedure adds is a boundary: throwing coins for a minute separates ordinary thinking from concentrated reflection, the way a fixed time and place separates a meeting from a conversation. The boundary is the tool. The hexagram is only its content.

The limits of one cast

Coin casting can produce any of the sixty-four hexagrams, and it can produce them with a changing-line pattern that shows which parts of the situation are in motion. It cannot produce a more accurate hexagram. Every figure is equally likely and every figure is an equally valid prompt; the idea that one method is more authentic than another is a claim about lineage, not about effect.

It also cannot tell you what to do. It can give you a pattern to think with, and the decision stays yours. A hexagram may describe a situation as favourable or unfavourable, but those words describe the structure of the situation rather than its outcome: a favourable figure describes a situation in which success is structurally available if the right qualities are present. It is not a promise.

The honest summary is that coin casting is a conversation opener, not a conversation ender. You cast, you read, you reflect, and then you decide. The coins do not remove the weight of the decision; they add a layer of structured consideration to it. That layer is worth having, and it is not a substitute for evidence, expert advice or your own values.

Disclaimer: This content is for informational and cultural reference purposes only. It does not constitute professional medical, legal, financial, or psychological advice. Readers should exercise their own judgment and consult qualified professionals for specific concerns.

Sources and review basis

Traditional references explain historical vocabulary and context. Official practical sources support only the observable safety, comfort, or environmental points noted in the article; they do not validate metaphysical claims.

  • Traditional reference

    Book of Changes (周易)

    Wikisource digital text · Accessed 2026-10-14

    The classical text that writes yang lines as 九 and yin lines as 六, which is where calling the ninth day double yang comes from. Cited for terminology, not for any claim about the date.

  • Practical source

    APA Dictionary of Psychology: Barnum effect

    American Psychological Association · Accessed 2026-07-14

    A psychology reference for why broad, favourable personality descriptions can feel personally accurate. It does not evaluate BaZi calculations themselves.

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This article is based on publicly available materials in traditional Chinese metaphysics and feng shui. It is intended as cultural reference and background knowledge only. Metaphysical predictions and feng shui suggestions are not substitutes for professional medical, legal, financial, or psychological advice. We encourage readers to apply their own judgment when interpreting the content. Learn more about our content guidelines