Benjamin Franklin · 1706
Heavy going at CET-4 level. Not unreadable — just not readable the look-every-word-up way.
Coverage = the share of words in the text you already know. The research gives two lines: 98% before independent fluent reading is realistic, 95% for the instructional level that needs support (Hu & Nation, 2000). Proper nouns are not counted as unknown — recognising that it is a name is enough; this book has 553 of them.
Advanced — read it with glosses. 66,699 words in total; at 150 words a minute for a non-native reader, about 7 h 25 min to finish. Average sentence length 30.2 words — on the long side, so the load comes from sentence structure as much as from vocabulary. Reaching 95% coverage on this book (the floor for readability) takes roughly 17,750 word families.
The opening of The Autobiography of Benjamin Franklin, word for word. Tap any word you don't know and its meaning here appears beside it — no sign-up, tap as often as you like.
Twyford, at the Bishop of St. Asaph's, [1] 1771.
Dear Son: I have ever had pleasure in obtaining any little anecdotes of my ancestors. You may remember the inquiries I made among the remains of my relations when you were with me in England, and the journey I undertook for that purpose. Imagining it may be equally agreeable to [2] you to know the circumstances of my life, many of which you are yet unacquainted with, and expecting the enjoyment of a week's uninterrupted leisure in my present country retirement, I sit down to write them for you. To which I have besides some other inducements. Having emerged from the poverty and obscurity in which I was born and bred, to a state of affluence and some degree of reputation in the world, and having gone so far through life with a considerable share of felicity, the conducing means I made use of, which with the blessing of God so well succeeded, my posterity may like to know, as they may find some of them suitable to their own situations, and therefore fit to be imitated.
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Computed by Readii from the public-domain text (updated 2026-10-21), not estimated by hand. The Readii reading level is our own scale, anchored on unknown-word density; it is not the same system as Lexile or AR and does not convert directly. Unknown words are measured against the CET-4 ∪ Gaokao lists, so this is difficulty for a Chinese-speaking learner, not a native-child reading level.