Reading Backlog Calculator
Calculate how long it will take to clear your reading backlog based on your reading speed and daily habit.
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How to use this calculator
Total words = books × pages per book × words per page. Daily reading capacity in words = reading speed (WPM) × daily minutes. Days = total words ÷ daily words.
- 1
Enter the number of books in your backlog and their average page count.
- 2
Enter your reading speed in words per minute — 250 is only a placeholder, so time yourself on a page of your own books if you are unsure.
- 3
Enter how many minutes you actually read each day (be honest!) to see when you will finish your backlog.
Frequently asked questions
How is the number of days calculated?
Total words = books × pages per book × words per page. Reading minutes = total words ÷ reading speed (WPM), and days = reading minutes ÷ minutes read per day, rounded up to a whole day. For 20 books of 300 pages at 250 words per page, 250 WPM and 30 minutes a day, that is 200 days.
How do I measure my reading speed?
Time yourself reading a page, count its words and divide by the minutes. The default of 250 WPM is a placeholder, not a measurement of you, and your speed will vary with the type of book. The calculator accepts any value of 1 or more.
What should I enter for words per page?
Count the words on a typical page of the books you own and use that, or the default of 250. Page layouts differ a lot between editions, so a single average across a mixed backlog is only an approximation. The minimum is 1.
Why are weeks and months only approximations?
Weeks = days ÷ 7 and months = days ÷ 30, so a month is always 30 days. The books-per-month figure is books ÷ those months. Both assume you read every single day at the same length.
What if I do not read daily?
The tool assumes a constant daily amount. If you read on five days of seven, enter your average per calendar day, which is weekly minutes ÷ 7, to get a calendar-day estimate.
Does the calculation include new books I add?
No. The backlog is fixed at the number you enter. If you buy books while reading, the finish date moves later; the tool cannot model that, so re-run it periodically.
How should I handle books of different lengths?
Use the average: total pages across the backlog ÷ number of books. Because the calculation multiplies pages and books anyway, an exact average gives the same total as entering each book.
What are the input limits?
Reading speed, words per page and minutes per day are each raised to at least 1. Books and pages per book can be 0, which gives a backlog of 0 days.
Reading backlog: pages, words and days to finish
From a stack of books to a number of days
The calculator converts the backlog into words, then into minutes of reading at your speed, then into days at your daily reading time. Each step is plain multiplication or division, and the day count is rounded up. Results also show total pages and words, total hours, weeks, months and the number of books per month that your pace implies.
Worked example: the default backlog
Twenty books averaging 300 pages are 6,000 pages and, at 250 words a page, 1,500,000 words. At 250 WPM that is 100 hours of reading. Reading 30 minutes a day takes 200 days, which is 28.6 weeks or 6.7 months, a pace of 3.0 books a month. A smaller case, 10 books of 350 pages at 300 words per page, 300 WPM and 45 minutes a day, takes 78 days (58 hours of reading, 3.8 books a month).
Comparing backlogs and habits
The table shows four runs. A large backlog of 50 books with a slower speed and 20 minutes a day stretches to 782 days, or about 26 months, at 1.9 books a month. The last row shows how a daily hour clears five 400-page books in 34 days. Notice that doubling the daily minutes halves the days, while a faster reading speed has the same effect on the reading time.
| Books × pages; words/page; WPM; min/day | Pages | Words | Reading time | Days | Months | Books / month |
|---|---|---|---|---|---|---|
| 20 × 300; 250; 250; 30 | 6,000 | 1,500,000 | 100 hrs | 200 | 6.7 | 3.0 |
| 10 × 350; 300; 300; 45 | 3,500 | 1,050,000 | 58 hrs | 78 | 2.6 | 3.8 |
| 50 × 250; 250; 200; 20 | 12,500 | 3,125,000 | 260 hrs | 782 | 26.1 | 1.9 |
| 5 × 400; 250; 250; 60 | 2,000 | 500,000 | 33 hrs | 34 | 1.1 | 4.4 |
What the estimate ignores
The model has no slow days, no re-reading, no books you abandon and no purchases. A single typical reading speed is used for every book, though dense non-fiction and light fiction are rarely read at the same speed. If a book takes noticeably longer, put those books in a separate run with their own speed and page figures, then add the days together.
Setting realistic daily minutes
Days are inversely proportional to the minutes you read each day, apart from the rounding up. The last scenario, an hour a day, finishes in 34 days, while the 20-minute scenario above runs to 782 days for a much bigger backlog. Enter the time you read on an ordinary day, including short stretches such as commuting, and not the time you hope to read. Re-run the calculator after a month using your real average.
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Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →