As user8789 says, there are formulas to calculate the reading level of a sample of text. Personally, I wouldn't take these too seriously.

For example, consider this paragraph:

The children were playing with a soccer ball in the yard, and when Bethany kicked it, it went way over the fence, into the neighbor's yard, and then it rolled very far down the hill before it finally came to a stop at the river.

According to this site -- readability-score.com -- it's Flesch-Kinkaid grade level is 17.2. That is, it requires a post-graduate degree to understand. Do you really think that you need a PhD to understand that?

Now consider this paragraph:

The Intel CPU executes 16 million FIPS per second. It uses a high speed front-side bus to help move data between the RAM and the registers. It has a very large instruction set. This includes commands for basic adding and subtracting, indexing, and moving text data. It has a width of 64 bits.

That has a Flesch-Kinkaid grade level score of 5.2. So any 13 year old should easily be able to understand it.

The problem with these readability formulas is that they only look at lengths of words and lengths of sentences, not at the complexity of the ideas. A simple sentence like, "In my closet I found a ball, a cardboard box, three adorable dolls, a pack of baseball cars, two pairs of trousers, and a sweater" gets a fairly high grade level because there are many words in the sentence and several that are quite long. I can easily write paragraphs about computers that score very low even though they are very complex because computer people tend to use short words for very complex ideas, like "bit" and "list" and "float".

Also, these formulas only consider the number of words in the sentence, and not the complexity of the sentence structure.

George Washington was the commander-in-chief of the continental army. He was also the first president of the United States.

Grade level 7.6

George Washington was the commander-in-chief of the continental army and he was the first president of the United States.

Grade level: 11.1

That is, just joining two sentences with an "and" jumps the difficulty by 3 1/2 grade levels. In real life, I think not. Is it more difficult to read the one long sentence? I suppose. But not that much more difficult.

Before you consider that, you -- and all readers -- should look at other suggestions, many of them subtle, which are found in the books we talked about earlier.

FK: 11.5

I walked down the street and I passed the grocery store, the barber shop, the bakery, the auto mechanic, an Italian restaurant, two Laundromats, and a school with a big playground.

FK 14.4

The second sentence scores higher because it has more words and longer words. But surely it is far easier to understand because the structure of the sentence is simple. It's just a long list.

I'm not saying the formulas are worthless. I'm just saying that I don't think they're worth very much.

If this sounds like a rant, well, maybe it is.

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