How Long Does It Take to Read 400 Pages?
7 hours. That is 400 pages at the average adult reading speed of 238 words per minute, using the standard 250 words-per-page estimate — about 100,000 words in total. The pace table below covers slower and faster readers, and the nearest classic on this site's timed shelf is The Seven Husbands of Evelyn Hugo (400 pages) with its own reading-time breakdown. Any other count? The reading time calculator is instant.
Reading time by speed
| Reading pace | Time to read 400 pages |
|---|---|
| Slow (150 wpm) | 11 hours and 7 minutes |
| Average (238 wpm) | 7 hours |
| Fast (350 wpm) | 4 hours and 46 minutes |
| Speed reader (450 wpm) | 3 hours and 42 minutes |
Pages, words and editions
Every number here assumes 250 words per page — the manuscript standard that school papers and publishers use. Real books wander: a dense paperback can hold 350 words on a page, a large-print edition 150, and an illustrated guide fewer still. The honest way to compare books is therefore words, not pages, which is why the 133-classic reading-time shelf times every title from its word count. For 400 pages the working figure is 100,000 words — close enough to plan an evening or a week around.
Sessions and habit math
At 30 minutes a night it lasts about 15 days; at an hour, about 8. Past a few hundred pages the book stops being an evening and becomes a habit — pick the session size first and let the days accumulate. Measure your real pace once with the reading speed test and every estimate on this site becomes yours.
Other page counts
50 pages · 100 pages · 150 pages · 200 pages · 250 pages · 300 pages · 400 pages · 500 pages · 750 pages · 1000 pages — or browse every classic by length on the how long to read shelf.
Frequently asked questions
How long does it take to read 400 pages?
7 hours at the average adult pace of 238 words per minute, assuming ~250 words per page. A slow reader (150 wpm) needs about 11 hours and 7 minutes; a fast reader (350 wpm) finishes in 4 hours and 46 minutes.
How many words is 400 pages?
About 100,000 words at the standard 250 words-per-page estimate. Published books vary — dense paperbacks run 300-400 words per page, large-print editions as few as 150 — so treat it as a planning figure.
How long is 400 pages as an audiobook?
Roughly 10 hours and 45 minutes — narrators read at 150-160 words per minute, slower than the eye. The reading-time calculator converts any word count to both reading and listening times.
How many pages can an adult read in an hour?
About 45-55 pages per hour for average fiction at 238 wpm. Page density matters more than speed: 250 words per page is the standard estimate, but editions vary by 50% or more.