You open an audiobook page and it says 14 hours 22 minutes. Your first thought probably isn't "great", it's "when would I ever find the time?" Then you remember you listen at 1.5x, so it can't really be 14 hours. But what is it? Divide 14h 22m by 1.5 in your head and most of us give up halfway through the sum. (It comes to about 9 hours 35 minutes, by the way.)

That small bit of maths is the reason this free audiobook speed calculator exists. Type in the length of the book, pick a speed, and you see straight away how long you will really be listening, how much time you've saved, the day you'll finish, and how fast the narrator is effectively talking. There's no sign-up and nothing to install.

The rest of this guide goes through every part of the calculator, the formula behind it, and how to choose a speed that saves time without turning the story into a blur. Jump to whatever you need from the contents above.

What is an audiobook speed calculator?

An audiobook speed calculator works out how long a book will really take once you change the playback speed. You give it the running time printed on the book's page and the speed you listen at, and it does the division for you. Some people search for it as an audiobook time calculator, an audiobook listening time calculator or a playback speed calculator. They all mean the same thing.

Why do you need one at all? Because stores and library apps show the original running time, the length at normal speed. Your player doesn't rewrite that number when you move the speed slider, so the figure on the screen stops matching your real listening time. A 12-hour book still says 12 hours even when you're going through it at 2x.

Knowing the true time is useful in more situations than you might expect:

• Library loans. Borrowed audiobooks expire. If you've got three weeks, you can check whether the book fits before you start, not after you've run out of days.
• Commutes and trips. You can see whether a book will last the whole journey or only the first half of it.
• Reading challenges. Aiming to finish a set number of books this year? The numbers show what a faster speed is actually worth.
• Choosing a speed. Seeing the hours saved at 1.25x next to 1.5x makes it easier to decide whether the extra speed is worth it.
• Anything with a duration. It works for podcasts, lectures and videos too. More on that further down.

How to use this audiobook speed calculator

The calculator at the top of this page has just three inputs. Here is each one in turn, plus the extras that are easy to miss.

1. Enter the book length. Find the running time on the book's page or inside your audiobook app and type the hours and minutes into the two boxes. Typing 90 into the minutes box is fine: when you click away, it tidies itself up to 1 hour 30 minutes. While a number above 59 is sitting in the minutes box, it gets a pink outline as a gentle nudge. On a computer, the up and down arrow keys change the value by one, and holding Shift moves minutes by ten. You can also enter the time you have left in a book you've already started, to see how long the rest will take.
2. Pick a playback speed. There are three ways to do it. Tap one of the preset chips (1x, 1.25x, 1.5x, 1.75x, 2x, 2.5x or 3x). Drag the slider, which covers 0.5x to 3.5x. Or use the minus and plus buttons beside the speed, which move in steps of 0.05x, so a custom speed like 1.35x or 1.8x is only a few taps away. The number between the buttons always shows exactly where you are.
3. Go beyond the usual limits if you want to. Plenty of calculators stop at 2x or 3x. This one doesn't. Keep pressing plus and the slider stretches to follow you, all the way up to 999x. Keep pressing minus and it goes down to 0.05x. Nobody listens to a book at 999x, of course, but a very slow speed is handy for language learning or transcribing, and a very high one is a fun way to see how the maths behaves.
4. Set how long you listen each day. The "Listening per day" box starts at 60 minutes. Use its minus and plus buttons to change it in 15-minute steps, or type any number from 1 to 1440 minutes. This is what the finish date is based on.
5. Read your results. Everything updates the moment you change an input. There's no calculate button and nothing to submit. The next section explains each result.
6. Compare every speed at once. Press the Compare button and a panel slides up with 11 speeds side by side: the listening time, the change from the original length and the days needed at your daily listening time. It works as a ready-made audiobook speed comparison for whatever length you've entered. Tap any row to switch the calculator to that speed. If you're on a speed that isn't in the list, such as 1.35x, it gets added to the table so you can see it in context. Close the panel with the red button.
7. Copy the result. The Copy button puts a one-line summary on your clipboard, for example: "A 10h 30m audiobook at 1.5x takes 7h 00m. That saves 3h 30m (33.3% less time). At 60 min a day, it's done in 7 days." Paste it into a note, a message to a friend or a reading-challenge post.

One more thing: the calculator remembers the last length, speed and daily time you used, in your own browser, so they're waiting for you next time. It doesn't send what you type to anyone.

A worked example

Say your book is 10 hours 30 minutes long, you listen at 1.5x and you've got an hour a day to spare. This is what the calculator shows:

What each result means

The big purple panel is where the answer lives. Here is what each part of it tells you.

• The big time. This is your real listening time in hours, minutes and seconds. The line above it repeats your speed, for example "At 1.5x you'll finish in". Below 1x the wording changes to "it will take", because slowing down makes the book longer.
• The progress bar. It compares your new listening time with the original running time, which is printed at the bottom right of the bar. The shorter the bar, the more time you've saved. If you slow a book down so it gets longer, a thin white marker appears to show where the original length would have ended.
• Time saved (or Extra time). This card shows how much shorter the book has become, with the percentage underneath. At 1.5x that is 33.3% less time. Used as an audiobook time saved calculator, it answers the question "is the faster speed worth it?" in one glance. Pick a speed below 1x and the card switches to Extra time instead.
• Done in. The number of days you need at your daily listening time, with the date you'd finish if you start today. If you can get through the book in a single day it says "Finish today". The sums behind it are in the finish date section further down.
• Pace. The narrator's effective speaking speed in words per minute, plus a one-word label: Slow and easy, Natural, Brisk, Fast or Very fast. There's more on this in the narration pace section.
• The waveform. It's mostly there for looks, but it isn't random. It scrolls faster as you pick a faster speed, so you can sort of watch the narrator speeding up.

The formula behind the calculator

There's nothing mysterious going on. Speed is a multiplier on how fast the narrator talks, so the time goes down by that same factor:

Take the example above. 10h 30m is 630 minutes. Divide by 1.5 and you get 420 minutes, which is 7 hours. Subtract that from 630 and you've saved 210 minutes, or 3 hours 30 minutes. Divide that saving by the original and you get 33.3%. At 60 minutes a day, 420 minutes lasts exactly 7 days.

Why 1.5x saves a third, not half

This catches nearly everyone the first time. Listening 50 percent faster does not cut the time by 50 percent. You still have the same amount of book to get through, you're just covering it at 1.5 times the rate. So the time becomes two thirds of what it was, and the saving is the remaining third.

A few shortcuts worth remembering:

• At 1.25x you save one fifth (20%).
• At 1.5x you save one third (33.3%).
• At 2x you save half (50%).
• At 3x you save two thirds (66.7%).

For quick mental maths at 1.5x, multiply the minutes by two and divide by three. At 2x, just halve it.

How rounding works

The calculator converts everything to seconds and rounds the new listening time to the nearest whole second. The time saved is then worked out from that rounded figure, which is why the new time plus the time saved always equals your original length, with no stray seconds left over. The percentage comes straight from the speed, so it never wobbles because of rounding.

Audiobook length at 1.25x, 1.5x, 1.75x and 2x

If you only need a quick answer, this audiobook speed chart covers the lengths people ask about most. It shows audiobook length at different speeds, rounded to the nearest minute. For anything that isn't in the table, like a 9 hour 47 minute book at 1.35x, type it into the calculator and it does the same division on the exact numbers.

Searching for a 1.5x speed calculator or a 2x speed calculator? The answer is the same every time: multiply the minutes by two thirds for 1.5x, or halve the book for 2x.

How long is an audiobook for a 300-page book?

Sometimes there's no audiobook yet, or you're choosing between the paperback and the audio version. A printed page holds roughly 275 words, and a commonly quoted rule of thumb is that a narrator gets through about 9,300 words in a finished hour. That's around 155 words a minute, the same figure this calculator uses for pace. It gives these ballpark numbers:

Real audiobooks vary with the narrator, the page layout and extras like introductions, so treat the table as an estimate rather than a promise.

How much time does each speed really save?

Here's where it gets interesting. Speeding up always saves time, but each extra notch saves less than the one before it.

Look at the very first step, from 1x to 1.25x. It hands you back 12 minutes in every hour. The next step, 1.25x to 1.5x, adds only 8 more. Going from 1.75x to 2x adds just over 4. Past 2x the curve is nearly flat, and the whole jump from 2x to 3x gains 10 minutes per hour, roughly what that first small step gave you. That's why so many listeners settle somewhere around 1.25x to 1.5x: most of the saving, with the least strain on your ears.

The saving still adds up over a whole book. On a 12-hour title, 1.25x gives you back 2 hours 24 minutes, 1.5x gives back 4 hours and 2x gives back 6.

How many audiobooks can you finish in a year?

This is the one that makes speed feel real. Suppose you listen for one hour a day and your books run about 10 hours each. Over a year that's 365 hours of listening, or about 36 books at normal speed. Now add speed:

Those are sums with round numbers, since real books vary and nobody listens every single day, but the direction is clear. At 1.5x you'd finish about 18 more books a year than at 1x without adding a minute to your listening time. Listening for 30 minutes a day instead? Halve every number.

Got a stack of books and can't decide which to start? Drop your shortlist into the list randomizer and let it pick for you.

Narration pace and words per minute

Next to the finish date, the calculator shows a pace figure in words per minute (wpm). It answers a different question from "how long?". It tells you how fast the words are actually reaching your ears, which makes it a small audiobook narration pace calculator built into the main one.

The starting point is 155 wpm, a typical pace for a professional narrator. Multiply it by your speed and you get your effective pace. At 1.5x that's 232.5 wpm, which the calculator rounds to 233.

It helps to set that against how we read. Adults reading silently tend to manage somewhere around 240 words per minute, give or take, with plenty of variation between people and between books. So at 1.5x you're being read to at roughly the speed you'd read yourself, which goes some way to explaining why that speed feels natural to so many listeners.

The labels follow simple cut-offs: under 140 wpm is Slow and easy, 140 to 180 is Natural, 181 to 250 is Brisk, 251 to 330 is Fast, and anything above that is Very fast.

What is the best audiobook listening speed?

There's no single right answer, and anyone who gives you one is guessing. The best audiobook listening speed is the fastest one where you can still follow the story without effort. That depends on you, the narrator and the book.

As a starting point, here's how people commonly match speed to what they're listening to:

These are starting points, not rules. If you catch yourself rewinding every few minutes, you've gone too far, so drop back a notch.

How to find your own speed

The easiest way to find your top speed is to creep up on it. Start at 1x or 1.25x and raise the speed by 0.05x or 0.1x every few days. A change that small is hard to notice, but after a couple of weeks you'll be comfortable at a speed that would have sounded rushed on day one. The calculator's plus and minus buttons move in exactly those steps, so you can see what each bump is worth in saved time before you change it in your player. When a book starts to feel like work, go back a step and stay there for a while.

Tips for listening faster without losing the story

• Change one thing at a time. A new narrator, a new genre and a new speed all at once is a lot. Pick a narrator you already like when you're experimenting.
• Match speed to the moment. Washing up or walking the dog allows a higher speed than a quiet evening with a tangled plot. Slowing down a notch for names, dates and plot twists is perfectly normal.
• Make the sound clear. Fast speech is easier to follow through decent headphones than through a tinny speaker.
• Use chapter breaks. Pause at the end of a chapter, not in the middle of a sentence. It's much easier to pick the thread back up.
• Back up when you lose it. Many players have a 15 or 30 second skip-back button. Use it without guilt.
• Plan around real life. Listening on the road? Work out how long the journey will take with the estimated time of arrival calculator, then see whether the chapter will finish before you park. Listening in bed? The sleep calculator can help you pick a bedtime, and a sleep timer in your player stops the narrator carrying on after you've drifted off.

It works for podcasts, lectures and videos too

The calculator doesn't care what the audio is. All it needs is a running time and a speed, so it doubles as a podcast speed calculator, a lecture planner or a quick way to check how long a video will really take. Here's what speed does to everyday listening:

To use it this way, enter the duration in the hours and minutes boxes. For anything under an hour, put 0 in the hours box and the minutes in the second one.

Plan your finish date and days to finish

So, when will I finish my audiobook? The "Listening per day" setting turns the calculator into an audiobook finish date calculator. Once it knows your new listening time, it divides that by the minutes you listen each day and rounds up to whole days. Day one is today, so a book that needs 7 days ends on the seventh day, six days from now.

Rounding up matters. A book that needs 6 hours 40 minutes at 60 minutes a day is six full days plus a 40-minute session, so it counts as 7 days even though the last session is short. The calculator would rather give you a realistic date than an optimistic one.

Here is how many days a 10-hour book takes at different daily listening times:

The same book takes ten days at 1x with an hour a day, but only five at 2x. If you borrow from a library with a fixed loan period, this is the quickest way to see whether you'll finish in time. Enter the length, set your daily minutes and check the Done in card.

Want to know how far through a book you are as a percentage? Divide the time you've listened by the total length and multiply by 100, or let the percentage calculator do it.

The short version

• Divide the book length by your speed to get your real listening time.
• 1.25x saves a fifth, 1.5x saves a third and 2x saves half.
• The first small speed-ups save the most. Beyond 2x you gain very little.
• Find your speed by creeping up 0.05x at a time, and slow down for dense or unfamiliar material.
• Set your daily listening time to get a finish date, and use Compare to see every speed side by side.

Frequently asked questions

Tap a question to see the answer.

How long is a 10-hour audiobook at 1.5x speed?

It takes 6 hours 40 minutes. Ten hours is 600 minutes, and 600 divided by 1.5 is 400 minutes. That saves you 3 hours 20 minutes compared with normal speed.

How do I calculate audiobook time at a different speed?

Turn the length into minutes, divide by the speed, then turn the answer back into hours and minutes. For an 8-hour book at 1.25x, that is 480 divided by 1.25, which gives 384 minutes, or 6 hours 24 minutes. The calculator above does all of it in one step.

How much time do I save at 1.25x, 1.5x and 2x?

In every hour of audio you save 12 minutes at 1.25x, 20 minutes at 1.5x and 30 minutes at 2x. As percentages that is 20%, 33.3% and 50% less listening time.

What is the best audiobook listening speed?

The fastest speed at which you can still follow everything without effort. Many listeners settle somewhere between 1.25x and 1.5x, while dense non-fiction usually deserves a slower pace. The best speed section above has starting points for different kinds of listening.

Is 2x too fast for audiobooks?

Not necessarily. Plenty of people enjoy 2x for light or familiar books. It is more demanding with complicated material, unfamiliar accents or when you are tired. Build up gradually, and drop back a notch if you start rewinding a lot.

Can I use the calculator for podcasts, lectures or videos?

Yes. It only needs a running time and a speed, so it works for any audio or video. Enter the length in the hours and minutes boxes and read the result as normal.

Can I go below 0.5x or above 3.5x?

Yes. Keep pressing the minus button to go down to 0.05x, or the plus button to climb all the way to 999x. The slider stretches to follow you, and every speed moves in steps of 0.05x.

How is the finish date worked out?

The calculator divides your new listening time by the minutes you listen each day and rounds up to whole days. Day one is today, so a book that needs 7 days ends on the seventh day, which is six days from now.

What does the pace in words per minute mean?

It estimates how many words per minute reach your ears at the chosen speed. It starts from 155 words per minute, a typical narrator pace at normal speed, and multiplies it by your speed. It is an estimate, because every narrator is a little different.

Why does the calculator say Extra time instead of Time saved?

Because you picked a speed below 1x. Slowing the narration down makes the book longer, so the card switches to Extra time and shows how much more listening you are signing up for.

Why is the time in my audiobook app slightly different?

Apps can count intros, credits or chapters differently, round the time they show, or offer features that shorten pauses. The calculator uses exactly the length you type in, so a difference of a minute or two is normal.

Is the calculator free? Do I need an account?

It is completely free and there is nothing to sign up for. The calculator remembers your last length, speed and daily time in your own browser so they are there next visit, and it does not send what you type to anyone.

Can I add this calculator to my own website?

Yes. Copy the embed code in the last section of this page and paste it into the HTML of your own page or post.

Add this calculator to your website

Run a book blog, a study-skills site or a productivity newsletter? You can put this audiobook speed calculator on your own page for free. Copy the code below and paste it into the HTML of your page or post, wherever you want the calculator to appear.

1. Press Copy code below.
2. In your website editor, switch to HTML view or add a Custom HTML block.
3. Paste the code, then save or publish your page.

The embed fits the width of your page and always shows the latest version of the calculator, so you won't have to update anything later.