Is the I Ching Accurate? A Straight Answer

Is I Ching divination accurate? The coins are random and a hexagram predicts nothing specific. Why a random hexagram can still help, and when not to cast.

First, what "accurate" means

If "accurate" means that a hexagram can call a specific event in advance (whether you will be promoted next month, whether this deal will make money), then the answer is no, it cannot. This site does not use it that way, and does not believe it can be used that way.

Which way three coins land is random. On this site, each coin's face is decided by a cryptographically secure random number, with even odds, and it has no physical connection whatsoever with what you have in mind; the same is true of real coins thrown by hand. Which of the sixty-four hexagrams and three hundred and eighty-four lines you land on is decided by chance. There is no need to be coy about this (see Sources and method).

Many people feel afterwards that a reading was "uncannily accurate", and there is an ordinary reason for that. The judgments and line statements are terse and archaic, mostly images and metaphors, and a single sentence has room for many different situations. As people read, they pick out for themselves the parts that fit and let the parts that do not fit go by. This tells you how people read, not how the hexagram knows.

Why a random hexagram can still be useful

Being useful and being able to predict are two different things. When you have turned something over for a long time and still cannot decide, it is mostly not because you lack information but because your thinking keeps circling in place: the same few reasons, weighed over and over. What you need then is not one more round of weighing, but an angle that comes from outside.

It gives you an angle you did not pick yourself. The judgments and line statements speak of situations and of the attitude to take within them: whether to advance or wait, to speak or keep silent, whether you have been going too fast and it is time to pull back. The one you land on by chance, precisely because you did not pick it, may touch the side you have been steering around all along.
It forces you to get the question clear first. Before casting, you have to settle what you are asking into a single sentence. This step is often useful in itself: quite a few people discover only at this point that what they really cannot decide is not what they thought it was (see How to ask the I Ching a question).
It gives you a stretch of quiet time. Ask, be still, throw, read: for those few minutes you think about this one thing only. The ancients cast with yarrow stalks, and working through the eighteen changes takes far longer; the intent was the same (see The yarrow-stalk method and the coin method).

Whether the sentence you read is right is for you to judge. If you feel it has touched on something, follow the thought further. If you feel it has nothing to do with you, that is a conclusion too: on this matter you have most likely already made up your mind.

"Those who are good at the Changes do not divine"

The words are from the Dalue ("Great Compendium") chapter of the Xunzi: someone who has read the Changes through and through has no need to cast. The sixty-four hexagrams speak of sixty-four kinds of situation, and the six lines speak of different positions within a situation. Once you know them well, you recognize things for yourself when they come up: which hexagram the present resembles, which line you are standing on, and what to do. The book has long since had something to say about it.

So for the ancients who understood the Changes, divination was not the book's most important use; what mattered was reading it in ordinary times. Casting is just one way of reading it: you borrow a moment of chance to make yourself read, in earnest, a text you would not otherwise read. Zhang Zai of the Northern Song said: "The Changes gives counsel to the noble one, not to petty people." It advises those who want to do things rightly; about something improper, asking is no use.

When not to cast

When you have already made up your mind. The Zuozhuan ("Zuo Commentary") has the line "Where there is no doubt, why divine?": if nothing is in doubt, there is nothing to divine about. If you want the hexagram to put a stamp of approval on your own decision, you would do better just to go and act.
When you want a different answer. About asking the same thing again and again, the judgment of Meng (Youthful Ignorance) is blunt: "At the first divination I answer. To ask a second and third time is disrespect, and disrespect gets no answer." See One question, one cast.
When you need professional judgment. If you are unwell, see a doctor; if you are in a dispute, ask a lawyer; for how to arrange your money, ask someone who knows the field. There are no diagnoses, statutes or market prices in the judgments and line statements. Do not use them in place of professional medical, legal or financial judgment, and above all do not put off seeing a doctor, or make a major financial decision, because of a hexagram.
When you are in a very bad state of mind and desperate for an answer. At such a time, whatever you read, you will take it the worst possible way. Give it some time first, and find someone to talk to; if it has already become hard to bear, seek professional help.

Apart from these: a specific matter that you truly cannot decide, and a willingness to be quiet for a few minutes and think it over in earnest. That is the right time to cast a hexagram. For how to read it once it is cast, see How to read a hexagram step by step.