How long it really takes you to finish a book

The question "how long is this book?" has two answers. The first measures the text: words, pages, hours of reading. The second measures your life: in how many calendar weeks you will finish it, with the time you actually have. This calculator connects them. Enter the length of the text in thousands of words, your reading speed, the minutes you read on a reading day and how many days a week you read: you get pages, total hours, effective reading days and weeks to reach the last page.

It works for novels, essays, study books, work documentation and any text whose word count you know, in any language.

How the calculation works

The model starts from four figures: the words in the text N (in thousands), the speed v in words per minute, the minutes per day m and the days per week g.

• Pages = 4 × N, using the publishing convention of 250 words per page.
• Total hours = 1000 × N / (60 × v): they depend only on the text and the speed.
• Reading days = 1000 × N / (v × m): how many sessions it takes.
• Weeks = 1000 × N / (v × m × g): the finish line on the calendar.

Each result ignores something: pages do not know how fast you read, hours do not know how much time you have, days do not know how many days a week you read. Only the weeks bring everything together, and the verdict is based on them.

From words to pages and hours

Page counts vary widely between editions, formats and typefaces: the same novel can run to 300 pages in one edition and 450 in another. Words do not change, which is why the calculator starts from them. The 250 words per page are a declared convention, useful for a comparable order of magnitude.

A novel of average length, between 70,000 and 100,000 words, takes between 5 and 8 hours of pure reading. That is less than most people imagine: the problem is almost never the length of the book, it is the gap between one session and the next.

How fast an adult reads

A 2019 meta-analysis of almost two hundred studies (Brysbaert) puts the average silent reading speed of adults in English at around 238 words per minute for non-fiction and 260 for fiction, with wide individual differences. Languages with longer average words are read at a somewhat lower number of words per minute. To estimate your own speed, time five minutes of normal reading and count the words you read.

The calculator accepts speeds from 120 to 400 words per minute. Beyond that threshold, research on speed reading suggests comprehension tends to drop: reading faster than that usually means skimming the text rather than reading it.

The two levers: more time or more speed

To finish a book sooner you can pull two levers: read more minutes a day or read faster. In the weeks formula they enter the same way, multiplied together, so what counts is the proportional increase. The table shows the weeks for a 90,000-word text read five days a week.

Across the columns, going from 200 to 300 words per minute, a 50% increase that takes a lot of practice, cuts the finish line by a third. Down the rows, going from 10 to 20 minutes a day halves it, and finding ten minutes is within almost everyone's reach. For people who read little, time is the stronger lever; for people who already read a lot, extra minutes count for less and less.

Which lever wins in your case

The rule is exact and simple: ten more minutes a day gain you more than a hundred more words per minute when your speed is more than ten times your daily minutes. If you read 20 minutes a day, the threshold is 200 words per minute; if you read 30, it is 300.

When the book is a one-to-three-month project, the calculator's verdict shows both figures for your case, so you can see which lever pays more. Even when speed wins, remember the cost: a hundred more words per minute is a training goal, ten minutes is a scheduling choice.

Days per week: the lever that does not look like one

Someone who reads only at weekends has two reading days; someone who reads every evening has seven. That is a factor of 3.5 on the finish line, all else equal, bigger than any realistic improvement in speed. This is why the calculator separates minutes on a reading day from days per week: they are two different habits, and the second is often easier to change than the first. A quarter of an hour every evening goes further than an hour on Sunday.

The four bands of the verdict

The verdict is based on the calendar weeks needed to finish the text:

• Under one week: the book is a morsel, finished before life notices.
• One to four weeks: the book of the month, the band of regular reading.
• Four to twelve weeks: a season's project; here the calculator compares the two levers.
• Twelve weeks or more: an undertaking; at this distance consistency matters more than anything else.

For texts of 600 pages or more, the verdict adds a note on the "doorstopper", the work that fills a shelf and a season.

Estimating the words in a text

For an ebook, many e-readers and major publishers' websites give the word count or a standard page count. For a printed book you can count the words in three typical lines, take the average, and multiply by the lines on a page and by the pages. For a digital document, the word count in your text editor is exact. The calculator works in steps of 10,000 words: round to the nearest ten thousand.

Using it for study and work

The same calculation helps you plan reading for exam texts, a body of technical documentation or the bibliography of a thesis. For study texts it is worth entering a lower speed than you use for fiction, because reading with notes and rereading is slower. Adding up the words of all the texts gives you the weeks needed, which you can compare with the exam date.

Limits of the calculator

The model assumes a constant speed and regular sessions. It does not account for rereading, pauses to think, notes, images or tables, which slow down the reading of technical texts. The 250 words per page convention is an average: a pocket edition may hold more, an illustrated edition far fewer. Use the results as an order-of-magnitude estimate for planning, not as a deadline.

Frequently asked questions

How long does it take to read a book?

It depends on the words and your speed: a 90,000-word novel takes 6 hours of pure reading at 250 words per minute. On the calendar, reading 30 minutes a day five days a week, that is 2.4 weeks.

How many words are on a page?

The calculator uses the publishing convention of 250 words per page. In reality it varies with format and typeface: a paperback may hold more, an illustrated edition far fewer.

What is the average reading speed?

A 2019 meta-analysis estimates about 238 words per minute for non-fiction and 260 for fiction in English among adults, with large individual differences.

How do I measure my reading speed?

Read normally for five timed minutes, count the words you read and divide by five. Repeat with two or three different texts and take the average.

Is it better to read faster or to read longer?

Ten more minutes a day gain you more than a hundred more words per minute when your speed is more than ten times the minutes you read each day. For one-to-three-month projects the calculator shows both figures for your case.

Why is the maximum speed 400 words per minute?

Beyond that threshold research suggests comprehension tends to drop: you skim the text rather than read it. The calculator stays within the range of real reading.

What is the difference between reading days and weeks?

Reading days are the sessions you need, regardless of how many days a week you read. Weeks are the finish line on the calendar and take everything into account.

Does reading every day really make a difference?

Yes: going from two to seven days a week shortens the finish line 3.5 times for the same minutes. A quarter of an hour every evening beats an hour on Sunday.

How do I find the word count of a book?

For ebooks it is often shown by the e-reader or the publisher. For a printed book, count the words in a few typical lines, average them and multiply by lines per page and by pages.

Does it work for books in other languages?

Yes, the calculation is the same. Bear in mind that in languages with longer average words the speed in words per minute tends to be somewhat lower.

Can I use it to plan studying?

Yes: add up the words of all the texts, enter a lower speed than for fiction to allow for notes and rereading, and compare the weeks with your exam date.

Is the result precise?

It is an order-of-magnitude estimate. The model assumes constant speed and regular sessions, with no rereading, pauses, notes or images.