How the reading time calculator works
Reading time is words divided by reading speed, then multiplied by what you are doing with the words. Each of those three numbers moves the answer a lot, which is why "how long does it take to read 100 pages" has answers ranging from an hour to a full day.
Words per page
A paperback novel has around 250 to 300 words on a page. A standard textbook page with normal type and the odd diagram is closer to 400. A dense academic book or a two-column reference text can hit 550 or more. The three density settings cover that range; if you can count the words on one typical page of your book, pick whichever is nearest.
Reading speed
Most adults read non-fiction at roughly 200 to 250 words a minute with normal comprehension, and that figure has held up across decades of reading research. Faster is possible for easy, familiar material; much faster than 400 words a minute means skimming, whatever the speed-reading course promised. Pick slow (150) if the book is in your second language, the subject is new to you, or the text is full of formulas and symbols, which you read far more slowly than prose.
Purpose
This is the multiplier people forget. Reading a chapter once is the baseline. Studying it with notes takes about 1.8 times as long, because you stop, think, write and re-read. Learning it for an exam, where you need to be able to reproduce it, is around 2.5 times, since it includes recall questions and a second pass. Skimming is set at 0.6: headings, first sentences and summaries, not every word.
These multipliers are typical values, not laws. After one real session, compare your time with the estimate and adjust the speed or purpose setting so the plan tracks reality.
Using the result
The total time is the headline, but the per-page and pages-per-hour figures are what you plan with. Four pages an hour for exam-level study of a dense textbook sounds slow until you remember that it includes everything: the notes, the recall questions, the bit you had to read three times.
If you set a deadline, the result adds pages a day and checks it against the hours you said you have. "Fits in your day" means the plan works with a little spare. "Slightly over" means find a bit more time or treat some chapters as a lighter read. "Does not fit" is a signal to triage: which chapters need exam-level study and which can be read once?
The pomodoro count is there because a long reading job feels more possible as "14 focus sessions" than as "six hours", and because reading in 25-minute blocks with real breaks keeps comprehension up over a long afternoon. The pomodoro study planner turns the count into a timetable with break times.
Reading faster without reading worse
- Preview first. Read the headings, the summary and any questions at the end before the chapter itself. Knowing the shape of a chapter speeds up every paragraph in it.
- Ask, then read. Turn each heading into a question and read the section to answer it. This is the oldest study-reading technique there is, and it still works because it stops passive reading.
- Notes after, not during. Copying while you read halves your speed and teaches little. Finish a section, close the book, write what you remember, check.
- Finish with recall. Five questions you can answer without the book, written at the end of the session. They become your revision material and they prove the pages were actually learned.
- Do not highlight on the first pass. Highlighting feels productive and is near the bottom of the evidence table for study techniques. Mark the two things that mattered after you finish the section, if at all.
When the pages are too many
If the calculator says 60 hours and you have 20, the answer is not to read faster. Use the syllabus completion calculator to work out which chapters earn their marks, give those exam-level study, and read the rest once or skim them. A chapter you can answer questions on beats three you have merely seen.
Frequently asked questions
How long does it take to read 100 pages of a textbook?
At an average 230 words a minute and 400 words a page, reading 100 textbook pages once takes just under three hours. Studying them with notes takes around five hours, and learning them for an exam around seven. Dense, two-column text or a second language pushes those figures up by half or more.
How many pages can I read in an hour?
Around 30 to 35 pages of a normal textbook if you are reading once at average speed, 15 to 20 if you are studying with notes, and 10 to 15 if you are learning the material for an exam. Light books with large type go faster; dense academic texts go slower.
What is a normal reading speed?
Most adults read non-fiction at about 200 to 250 words a minute with good comprehension. Reading above 400 words a minute means skimming, however it is marketed. Reading in a second language, or reading maths and formulas, is often closer to 100 to 150 words a minute.
Why does studying take so much longer than reading?
Because studying includes stopping to think, re-reading hard parts, writing notes and testing yourself, all of which are what make the material stick. Research on effective study consistently finds that recall and spacing beat re-reading, so the extra time is not waste: it is the part that produces marks.
Does the calculator store my reading plan?
No. Your inputs are written into the page link so you can bookmark or share the plan, and nothing is sent to a server.