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Free tool · Amazon Ads ACOS Calculator

Amazon Ads ACOS Calculator that shows whether your Amazon ads pay for themselves

The amazon ads acos calculator works out your advertising cost of sales, your break-even ACOS from your royalty and price, your cost per click, your conversion rate, your cost per order and your profit on direct sales, using your ad spend, sales, clicks and orders, with an optional line for the pages read that your ads drive in Kindle Unlimited. It runs in your browser and is free for authors who run Amazon Ads.

Use the free tool

The amazon ads acos calculator is free to use, with no account and nothing uploaded.

  • ACOS and break-even ACOS
  • CPC and conversion
  • Profit on direct sales

Key facts

  • FreeNo cost, no account and no usage limit on the amazon ads acos calculator
  • In your browserNothing that you type or paste into the amazon ads acos calculator is uploaded
  • SecondsTypical time from opening the amazon ads acos calculator to a result
Free tool

Amazon Ads ACOS calculator

Work out your ACOS, your break-even ACOS and your profit from Amazon Ads, using your spend, your sales and the royalty that you earn on each copy.

The amazon ads acos calculator needs JavaScript, and it works in your browser without sending anything that you enter to a server.

Overview

What the amazon ads acos calculator does and why it helps

Advertising on Amazon can sell books and can lose money quietly, and the number that tells the difference is the ACOS, the advertising cost of sales. It is the share of the sales from your ads that you spent on the ads. If you spent 120 dollars and the ads brought 260 dollars in sales, your ACOS is about 46 percent. Whether that is good depends on how much of each sale you keep, which for an author is the royalty and not the price.

That is why the break-even ACOS matters. It is your royalty per sale divided by the price, because that is the share of each sale you can spend on ads and still break even. A 4.99 dollar ebook at the 70 percent plan pays about 3.49 dollars, so the break-even ACOS is about 70 percent, and an ACOS below that means the ads are paying for themselves on direct sales alone. A 0.99 dollar book, or a paperback with a thin margin, has a much lower break-even.

The calculator also shows the other numbers that guide an ad campaign: the cost per click, the conversion rate from clicks to orders, the cost per order and the profit on direct sales. An ACOS above break-even is not always a failure. Ads for the first book in a series can pay for themselves through read-through to later books, and ads for Kindle Unlimited titles earn page reads that a sales-only calculation ignores. The tool gives you the direct numbers, and the context is yours to add.

The Amazon Ads ACOS calculator shows your advertising cost of sales, which tells you whether your ads are profitable. Authors can use this free amazon ads acos calculator as often as they like, and it never asks for payment. You can use the amazon ads acos calculator online in any modern browser, with nothing to install. It is an amazon ads acos calculator for authors, so the defaults assume you are preparing a book rather than a business report. Indie writers can rely on it as an amazon ads acos calculator for self-published books. Amazon authors can use it as an amazon ads acos calculator for KDP with no changes. There is no account to create, so this amazon ads acos calculator no sign up page is ready the moment it loads. We cannot say what the best amazon ads acos calculator is for everyone, but we have made this one show its working so you can trust the answer.

How to use it

How to use the amazon ads acos calculator, step by step

01

Enter your ad spend

Type the total you spent on a campaign over the period you want to measure. Use the figure from your Amazon Ads dashboard for the same dates as your sales.

02

Enter your ad sales and orders

Add the sales revenue attributed to the campaign and the number of orders. The tool uses them to work out ACOS and cost per order.

03

Enter your clicks

Type the number of clicks, so that the tool can calculate your cost per click and your conversion rate from click to order.

04

Enter your royalty and price

Add the royalty you earn per sale and the price. The tool uses them to calculate your break-even ACOS, the level above which the ads lose money.

05

Add pages read if you use Kindle Unlimited

Add the pages your ads drive in Kindle Unlimited, if any, so that the tool counts that income as well as direct sales.

06

Read the verdict

Compare your ACOS with your break-even ACOS. If it is lower, the ads are profitable on direct sales, and if it is higher, adjust bids, keywords or the book page.

How the amazon ads acos calculator works

Spend, sales and the line between profit and loss

You enter your ad spend, the sales that the ads produced, the clicks and orders, the price of the book and your royalty per sale. The tool calculates ACOS, which is the spend divided by the sales, and the break-even ACOS, which is your royalty divided by the price.

It then compares the two. If your ACOS is lower than the break-even figure, direct sales more than pay for the ads. If it is higher, you lose money on direct sales, though that can still make sense if the ads lead readers into a series or into page reads. The tool also shows cost per click, conversion rate, cost per order and profit on direct sales.

A lower price changes the break-even point, because the royalty is a smaller share of the price, and an ad for a low-priced first-in-series book often runs at a loss to win a reader. Use the tool to set a target ACOS for each campaign and to decide when to pause one.

  • ACOS and break-even ACOS side by side
  • Cost per click, conversion and cost per order
  • A plain verdict on direct sales
Method

How the amazon ads acos calculator works out its answer

ACOS

Ad spend divided by the sales that came from those ads, shown as a percentage. It is the share of each ad-driven sale that went to advertising.

Break-even ACOS

Your royalty per sale divided by the book price. If your ACOS is lower than this, direct sales cover the cost of the ads.

Cost per click and conversion rate

Cost per click is spend divided by clicks. The conversion rate is orders divided by clicks, which shows how well your page turns visitors into buyers.

Profit on direct sales

Orders multiplied by your royalty per sale, minus the ad spend. It does not count read-through or page reads, which can add real value.

Worked examples

Amazon Ads ACOS Calculator: worked examples

A campaign with a 38 percent ACOS

The break-even ACOS is 45 percent, so the campaign is profitable on direct sales. The author increases the budget slowly and watches the result. The figures are illustrations, and your own text or settings will give different numbers in the amazon ads acos calculator.

A campaign with a 70 percent ACOS

The break-even is 45 percent, so the ads lose money. The author lowers bids and removes keywords that spend without selling. The same approach works for any manuscript, whatever its genre or length on this advertising review project.

A series starter

The ACOS is above break-even, but the author knows that many readers buy the rest of the series. The author keeps the ads at a limited budget and tracks read-through.

Key terms

Key terms to know when you use the amazon ads acos calculator

ACOS

Advertising cost of sales, which is ad spend divided by ad sales, shown as a percentage.

Break-even ACOS

The ACOS at which the ads neither make nor lose money, calculated from your royalty and price.

Cost per click

The average amount you pay each time someone clicks your ad. The amazon ads acos calculator uses the term in exactly this sense throughout its results and notes.

Conversion rate

The share of clicks that lead to an order. A low rate suggests a problem with the book page or the targeting.

Cost per order

Ad spend divided by the number of orders. It tells you what each sale cost you to win.

Pages read

Pages read in Kindle Unlimited, which pays by page and adds to the income from your ads.

Use cases

Where authors use the amazon ads acos calculator

Judging a campaign

See whether an ad campaign earns more than it costs, using your real royalty and not just the sales figure. Many authors confuse sales with profit.

Setting a bid or budget

Use your break-even ACOS to set a maximum bid, so that you stop paying more per click than the book can earn. It takes a minute with the amazon ads acos calculator and can save hours of rework at a later, more expensive stage.

Comparing ads for different books

Different books have different royalties and prices, so each has its own break-even ACOS. The tool shows them side by side. You can share the result of the amazon ads acos calculator with an editor, designer or formatter who needs the same numbers.

Common mistakes

Mistakes the amazon ads acos calculator helps you avoid

Using revenue instead of royalty

ACOS is measured against ad sales, but profit depends on your royalty. Check your break-even ACOS before you decide that a campaign is working.

Ignoring read-through

A first book in a series may lose money on direct sales and earn on later books. The tool shows only the direct result, so consider read-through separately.

Judging a campaign after too few clicks

A small number of clicks gives an unreliable ACOS. Wait for enough data before you change anything. The amazon ads acos calculator will not catch this for you, so keep it in mind when you read the result.

Tips

Getting the most from the amazon ads acos calculator

01

Know your break-even ACOS before you start

It sets the limit that any campaign must stay below to be profitable, and it guides every bid you set. The amazon ads acos calculator is free and instant, so it is worth running again whenever your book changes.

02

Compare cost per click and conversion rate

A low click cost with a poor conversion rate can still lose money, so look at both numbers together. Make the amazon ads acos calculator a routine step on every project, so that results stay consistent from book to book.

03

Review the numbers weekly

Keywords and competition change, so check regularly instead of leaving a campaign running unwatched. A few minutes with the amazon ads acos calculator now saves time across the whole manuscript.

Limits

How far to trust the amazon ads acos calculator

Estimates only

The tool uses what you enter. Amazon's own reports may count sales over a different timescale, so match your dates carefully. Treat the amazon ads acos calculator as a quick, free check, and confirm anything important with the platform or printer you will use.

No read-through

It shows only the direct result of one campaign and not later sales of other books in a series. The amazon ads acos calculator gives guidance, not a guarantee, so use it alongside your own judgement and, where it matters, a specialist.

Not advice on keywords

The tool measures results and does not choose keywords or bids, which still need your judgement. It runs in your browser with the figures you enter, so its answers are only as accurate as those figures with your advertising review.

Need it done for you?

When the amazon ads acos calculator is not enough

The calculator shows whether your ads pay. These services improve the things that make them pay: the cover, the page and the metadata behind every click.

Before and after

Before and after using the amazon ads acos calculator

The same ad campaign, first judged by how many sales it brought and then by what each sale cost against the royalty.

  1. 1Ads running with no idea if they pay
  2. 2A break-even that was never worked out
  3. 3Bids set by feel
  1. 1An ACOS compared with a break-even
  2. 2A conversion rate that guides the page
  3. 3Bids set from a known limit
  • 3problems found in the first review
  • 3fixes checked in the final review
  • 1named specialist owning every fix
  • Fixedprice confirmed in the calculator before you order
01

Clarity

You know whether each campaign is profitable on direct sales, and which ones need a closer look.

02

Smarter bids

The break-even ACOS sets a ceiling for your bids, so you do not overpay for clicks.

03

A better page

The conversion rate tells you when the cover, blurb or price needs work, and not the ad.

Client reviews

What authors say about our advertising review service

Verified reviews from authors who asked a specialist to handle the advertising review after using the amazon ads acos calculator.

As a first-time author, the technical side of self-publishing was genuinely daunting. The consultation covered every decision — platform choice, pricing strategy, metadata, and distribution. I launched with genuine confidence.

Obi NwosuDebut Nonfiction Author, NigeriaVerified client

Navigating IngramSpark's requirements for the first time felt overwhelming. The upload assistance handled everything — metadata, pricing setup, distribution channels. My children's book reached bookstores within two weeks.

Samuel OkonkwoChildren's Author Publishing Support Client, GhanaVerified client

My KDP file was rejected with a technical error message I could not understand. Book Formatting Experts diagnosed the problem immediately — a bleed issue on three pages — and corrected it the same day. Approved first time.

Taiwo AdeyemiRomance Author Publishing Support Client, NigeriaVerified client

Getting historical fiction placed in the right categories on Amazon and IngramSpark required strategic metadata. The team understood the genre classification and the book reached the right readers from the first week.

Nkechi AdeyemiHistorical Fiction Publishing Support Client, NigeriaVerified client

The formatting error fix service saved my launch. My original formatter had made margin errors causing repeated rejection. Book Formatting Experts identified and fixed every issue within 48 hours. My launch was back on schedule.

Ifeoma ChukwuThriller Author Publishing Support Client, NigeriaVerified client

My YA novel needed to reach both English-language and Japanese readers. The multi-region distribution setup was handled correctly across all required platforms. International sales have exceeded my expectations.

Yuki WatanabeYoung Adult Author Publishing Support Client, JapanVerified client

The publishing readiness review identified four issues in my manuscript that would have caused rejection. Each was clearly explained and quickly resolved. My book launched without any technical complications.

Sigrid LindqvistSelf-Help Author Publishing Support Client, FinlandVerified client

My cookbook needed to be set up across multiple platforms simultaneously. The publishing support team handled every submission — KDP, IngramSpark, and Apple Books — with different requirements for each. Flawlessly executed.

Cecile FontaineCookbook Author Publishing Support Client, FranceVerified client

Good support throughout the KDP upload process. The metadata setup and category selection were explained clearly. One pricing setting needed adjustment after initial setup but it was corrected quickly.

Aleksei PetrovFantasy Author Publishing Support Client, RussiaVerified client
More free tools

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Each of these tools is free, runs in your browser and works well alongside the amazon ads acos calculator.

FAQ

Amazon Ads ACOS Calculator: questions answered

These are the questions authors ask most about the amazon ads acos calculator, including accuracy, privacy and what to do next. If your question about the advertising review is missing, request a quote and a specialist will reply.

What is an Amazon Ads ACOS calculator?

It is a tool that works out your advertising cost of sales, your break-even ACOS and your profit, from your ad spend, sales, clicks and royalty.

What does ACOS mean?

ACOS stands for advertising cost of sales. It is the ad spend divided by the sales that the ads brought, as a percentage.

What is a good ACOS for books?

It depends on your royalty. A good ACOS is below your break-even ACOS, which is your royalty divided by the price.

How do I work out my break-even ACOS?

Divide your royalty per sale by the book price. The calculator does this from the figures you enter.

Why is my break-even ACOS lower for paperbacks?

A paperback royalty is a smaller share of the price after printing cost, so the share you can spend on ads is smaller.

Is an ACOS above break-even always bad?

No. Ads for a first book in a series, or for a Kindle Unlimited title, may pay back through read-through and page reads.

What is a good conversion rate for a book ad?

It varies by genre and price. A rate of a few percent is common, and a low rate suggests that the cover, blurb or price needs work.

What is cost per click?

It is the amount you pay when a reader clicks your ad, calculated as spend divided by clicks.

Does the tool count page reads?

It lets you add pages read as context, but the profit figure counts direct sales only.

Where do I find my figures?

Your Amazon Ads dashboard shows spend, sales, clicks and orders, and your KDP reports show your royalty.

Does the amazon ads acos calculator keep anything that I enter?

No. The amazon ads acos calculator works in your browser, so what you enter stays on your device and is never saved.

Is the amazon ads acos calculator free?

Yes, the ACOS calculator costs nothing, needs no account and puts no limit on the campaigns you check.

How does an amazon ads acos calculator work?

It divides your ad spend by your ad-attributed sales to give ACOS, and compares it with your break-even ACOS.

How to use an amazon ads acos calculator?

Enter your ad spend, sales and royalty per sale, then read ACOS and break-even ACOS.

Is there an amazon ads acos calculator with examples?

Yes. The page includes a worked example so you can compare it with your own numbers or text. Try a campaign with spend and sales to see profit or loss.

What is the amazon ads acos calculator formula?

ACOS equals ad spend divided by ad sales, multiplied by one hundred.

Can I use a amazon ads acos calculator spreadsheet instead?

You can, and a amazon ads acos calculator spreadsheet works if you are happy to maintain the formulas yourself. This page does the maths for you and shows the working, so there is nothing to copy or update.

Work with a specialist

Turn what you learn from the amazon ads acos calculator into a finished book

The amazon ads acos calculator costs nothing, and so does asking what a specialist would do with your book. When the amazon ads acos calculator has done its part and you want finished files, a fixed price and one named person who owns the job, we are ready to start.