Reading Time Calculator

Background.

This calculator turns a length you already know into a reading time, and turns a time slot you have been given back into the length that fills it. Give it a word count, a page count or a character count and it returns silent reading time, read-aloud time, and the same length restated in the other two units. Flip the direction and it answers the question every speaker and every content brief starts from: an eighteen-minute slot, at 238 words a minute, is 4,284 words.

It is deliberately not a word counter. If you have the text in front of you, paste it into the word counter — that page counts the words and gives you a reading time in one step. This page exists for the far commoner case where you have a number and not the text: a 90,000-word manuscript, a 320-page book, a 1,200-word brief, a 280-character post, a chapter someone described to you over the phone. You cannot paste 90,000 words into a textarea to find out how long they take to read, and no live page in this catalog runs the calculation backwards from a time slot at all. Those two gaps are what this page is for.

The arithmetic is one division, so everything that matters here is in the rates, and the rates are estimates rather than constants. The silent-reading default of 238 words per minute is the meta-analytic mean from Brysbaert's 2019 review of 190 studies and 18,573 participants, for silent reading of English non-fiction. The same paper puts fiction at 260 words per minute, because narrative prose is more predictable than exposition, and reading aloud at 183 words per minute, because speech is rate-limited by articulation rather than by the eye. All three numbers are editable inputs on purpose: reading rate varies with age, with first- versus second-language status, with text difficulty and with whether the reader is studying, reading or skimming, and a page that hid them behind a constant would be pretending to a precision the research does not support.

One divergence is worth stating before you compare pages rather than after. The word counter on this site defaults to 200 words per minute, the convention that Medium, Substack and most "5 min read" badges use; this page defaults to the measured 238. The two pages will therefore give different times for the same word count, and neither is wrong — 200 is a deliberately conservative publishing convention and 238 is a measured population mean. Both fields are editable, so you can make either page agree with the other in one keystroke.

The words-per-page setting is a convention too, and a looser one. No standards body defines how many words fit on a page: it depends entirely on trim size, type size, leading and margins. The 250 default is the long-standing figure for a double-spaced 12-point manuscript page with one-inch margins, the format that publishers' own submission guidance specifies, and it is why an 80,000-word novel is quoted as roughly 320 pages. A typeset paperback page holds nearer 350 to 450 words, so if you are working from a printed book rather than a manuscript, raise the setting before you trust the page figure.

Everything is computed with arbitrary-precision decimal arithmetic and rounded once, at the end. The two minute outputs are unrounded; only the human-readable labels round, and they round the total number of seconds before splitting it into hours, minutes and seconds, which is what keeps the label honest at a carry boundary.

What is reading time calculator?

Reading time is the length of a passage divided by a reading rate. The length can be counted exactly; the rate cannot, because it is a property of the reader and not of the text. That asymmetry is the whole subject: a 1,500-word article is 1,500 words for everybody, but it is six minutes for a fluent adult reading non-fiction silently, eight minutes read out loud, four minutes skimmed, and considerably longer for someone reading in a second language or studying to remember.

The research literature separates several rates that are often conflated. Silent reading for comprehension of ordinary prose averages 238 words per minute for non-fiction and 260 for fiction. Reading a prepared text aloud averages 183, and is capped by how fast a voice can articulate rather than by how fast the eye can move. Spontaneous speech is slower again, 125 to 160 words per minute, because it carries hesitation, repair and pausing that a read text does not. Carver's taxonomy adds the extremes: memorising is nearer 100 words per minute, skimming 450, and scanning for a single fact 600. Claims of 1,000-plus words per minute from speed-reading programmes are, in the reviewed literature, skimming with a comprehension cost rather than reading faster.

So the honest form of the answer is a rate plus a time, not a time alone. This page shows both, keeps both rates in editable fields, and names the source of every default.

How to use this calculator.

1. 01Pick a direction. 'Length → reading time' takes a length and returns a time. 'Time slot → length' takes a number of minutes and returns the word count that fills it.
2. 02In 'Length → reading time' mode, choose whether your figure is words, pages or characters, then enter it. Characters are divided by 5 to get words; pages are multiplied by the words-per-page setting.
3. 03In 'Time slot → length' mode, enter the slot in minutes. It is read as silent-reading minutes at the reading rate below — if you are writing a script to be spoken, put your delivery rate into the reading-rate field so the slot is measured in the right currency.
4. 04Set the rates. 238 wpm is the measured mean for silent non-fiction; switch to 260 for fiction, and lower it for a second-language reader or dense technical material. 183 wpm is the read-aloud default.
5. 05If you are using pages, check the words-per-page setting first: 250 is a double-spaced manuscript page, 350–450 is a typeset paperback page, and the page figure is only as good as that assumption.
6. 06Read the label for the human answer and the decimal-minutes figure beside it for anything you need to add up. If you have the text itself rather than a count, use the word counter instead — it counts the words for you.

The formula.

Every output on this page derives from a single word count, so the first step is always to reduce whatever length you gave to words. Words are taken as they are. Pages are multiplied by the words-per-page setting, 250 by default. Characters are divided by 5, the text-entry research definition of a word as five characters including the following space — the same divisor the typing speed calculator on this site uses, so the two pages cannot disagree with each other about what a word is.

With the word count fixed, silent reading time is the word count divided by the silent reading rate, and read-aloud time is the word count divided by the read-aloud rate. In the reverse direction the equation is simply rearranged: the word count that fills a slot is the slot in minutes multiplied by the silent reading rate. Because it is the same equation rearranged, the two directions round-trip exactly — 18 minutes at 238 words per minute gives 4,284 words, and 4,284 words at 238 words per minute gives 18 minutes back with no drift.

Rounding happens once, and only in the labels. The two decimal-minute outputs are unrounded to ten decimal places: 1,500 words at 238 words per minute is 6.3025210084 minutes, not 6.3. The label is produced by multiplying those minutes by 60, rounding the resulting total seconds to a whole number, and only then splitting it into hours, minutes and seconds — 378 seconds becomes '6 min 18 sec'. Rounding each component separately instead would let a value near a carry boundary render as '6 min 60 sec'. If you need to add several passages together, add the decimal-minute figures and label the total once; adding the labels compounds the rounding.

The read-aloud figure is always the larger of the two, at the default rates by a factor of 238 ⁄ 183, about 1.30. That direction is not a coincidence: silent reading is limited by how fast the eye can take words in, while reading aloud is limited by how fast a mouth can articulate them, and articulation is the slower constraint. If you ever see a read-aloud time shorter than the silent time on this page, one of the two rates has been edited into an unrealistic order.

A worked example.

Frequently asked questions.

References& sources.

1. [1]Brysbaert, M. (2019). "How many words do we read per minute? A review and meta-analysis of reading rate." Journal of Memory and Language, 109, 104047. The source of this page's rate defaults: across 190 studies and 18,573 participants, silent reading of non-fiction averages 238 wpm, fiction 260 wpm, and reading aloud 183 wpm. Access note: the DOI resolves to Elsevier and ScienceDirect returned HTTP 403 to automated retrieval on 2026-07-29, so the figures were taken from the open abstract and cross-checked against the same figures already cited on this site's word counter; the full text was not opened.
2. [2]Tauroza, S. & Allison, D. (1990). "Speech Rates in British English." Applied Linguistics, 11(1), 90–105. Used as the independent check on the read-aloud default rather than as its source. Their speech-rate guidelines put 'average' spontaneous and broadcast speech at 125–160 wpm, which does not conflict with Brysbaert's 183 wpm for oral reading — the two measure different constructs, and prepared reading being faster than unscripted speech is the expected direction. Abstract open; full text gated.
3. [3]Carver, R. P. (1990). Reading Rate: A Review of Research and Theory. Academic Press. Print monograph, cited bibliographically and not retrieved online. Source of the five-rate taxonomy quoted in the FAQs — memorising about 100 wpm, learning 200, normal silent reading 300, skimming 450, scanning 600 — used here only to justify the width of the editable rate range, not to set any default.
4. [4]MacKenzie, I. S. "A Note on Calculating Text Entry Speed" (York University). The definition behind the characters unit: a "word" in text-entry research is five characters including the following space. This is a definition rather than a measurement, and it is the same divisor the live typing speed calculator on this site uses, so the two pages agree on what a word is.
5. [5]Science Fiction & Fantasy Writers Association — Manuscript Format. Specifies the standard submission page: 12-point type, double-spaced, one-inch margins. It supplies the page geometry from which the 250-words-per-page convention is derived, and deliberately not a words-per-page number — no standards body publishes one, which is why words-per-page is an editable input on this page and is labelled a convention rather than a standard.