Book Profit Calculation
“Book profit” means two different things, and both sets of searchers land on this page. In accounting, book profit is the profit shown in the books: revenue minus expenses for a period, worked out through opening stock, purchases, closing stock and sales. In publishing, it is the money a book actually makes: price times copies sold, minus production, marketing, platform fees and royalties.
The calculator below serves both meanings honestly, in two tabs. The trading account tab computes cost of goods sold, book profit and margin from stock and sales figures. The publishing profit tab prices a book launch and returns net profit, profit per book and margin. Pick the tab that matches your question; the formulas are different and so are the answers.
Formatting, design, printing per unit.
Distributor cut or royalty paid per copy sold.
The two tabs answer different questions and share nothing but the card. Trading figures describe a period of buying and selling stock; publishing figures describe one book at one price. Do not mix inputs between them.
Quick Answer
Key takeaways
- Book profit in accounting is sales minus cost of goods sold, and cost of goods sold is opening stock plus purchases minus closing stock. Unsold stock is not a cost yet.
- Publishing profit is per-book economics scaled up: what one copy earns after production and platform fees, times copies sold, minus the fixed costs like marketing.
- The platform fee field is per copy, not a total. Platforms and distributors take their cut on every sale, so the tool multiplies it by copies sold.
- Book profit includes non-cash items such as depreciation and credit sales. Cash profit is a different, narrower figure, and the conversion between them is in the sections below.
Which tab answers your question
The two tabs exist because the search term covers two real jobs, and forcing one formula onto both produced wrong answers. Use this split before you type anything.
Trading account tab
- You buy and sell goods or stock over a period
- You have opening stock, purchases, closing stock and sales figures
- You want gross (book) profit and margin for the period
- Typical users: traders, retailers, students working a trading account exercise
Publishing profit tab
- You are pricing or reviewing one book launch
- You have a price, a copies figure and per-copy costs
- You want net profit, profit per book and margin
- Typical users: self-published authors and small publishers testing a price
If your real question is what a whole self-publishing project costs before it sells anything, that budget sits in the book publishing cost calculator. This page starts where that one ends: money coming in against money going out.
The two formulas, kept apart
Each tab runs one formula set. Read the one for your tab and ignore the other; mixing them is the commonest way this calculation goes wrong.
The accounting meaning behind the trading tab is broader than stock alone. Book profit in a profit and loss account is all revenues minus all expenses for the period, including non-cash items like depreciation and sales made on credit. Cash profit strips those back out: cash profit = book profit + non-cash expenses - non-cash revenues. If you are comparing this figure with a bottom-line result after tax and appropriations, the adjusted net profit calculator works that side of the accounts, and the profit ratio calculator expresses the same relationship as a ratio for benchmarking.
Worked examples, one per tab
Both tabs are pre-filled with the examples below, and every figure is what the calculator returns for those inputs.
| Trading account | Figure | Publishing profit | Figure |
|---|---|---|---|
| Opening stock | $20,000.00 | Book price x copies | $10.00 x 1,000 |
| Purchases | $80,000.00 | Revenue | $10,000.00 |
| Closing stock | $15,000.00 | Production ($0.50 x 1,000) | $500.00 |
| COGS | $85,000.00 | Marketing (total) | $500.00 |
| Sales | $120,000.00 | Platform fees ($3.00 x 1,000) | $3,000.00 |
| Book profit | $35,000.00 | Total expenses | $4,000.00 |
| Margin | 29.17% | Net profit / per book / margin | $6,000.00 / $6.00 / 60.00% |
The publishing example is an ebook, which is why production per copy is only $0.50 and the margin reaches 60%. Run the same book as a print edition with a realistic print cost per copy and the margin falls sharply, which is the single most useful experiment this tab offers: keep the price and copies fixed, raise production cost, and watch profit per book. The one-off costs you already paid to create the book, such as the edit priced in the book editing cost calculator, belong in other costs when you want a true launch profit rather than a per-print-run figure.
What the platform fee really represents
On the publishing tab, the fee field is where platform economics enter. Marketplaces do not charge authors a shelf fee; they take a percentage of each sale, which is why this tool asks for the cut per copy and scales it. According to Amazon KDP's official eBook royalty guidance, an ebook on the 70% royalty option keeps 70% of the list price less delivery costs in eligible territories, while the 35% option keeps 35% everywhere. On a $10 ebook those two options imply a platform share of roughly $3 or $6.50 per copy before delivery, which is exactly the range the fee field exists to model.
That is also why a royalty percentage alone never tells you your profit. A 70% royalty on a book with high print costs can pay less per copy than a 60% royalty on a leaner edition, and neither figure includes the marketing you funded yourself. Profit per book, after every cost in the tab, is the number that survives comparison.
Book profit, cash profit and net profit are not interchangeable
Three labels get swapped carelessly, and each swap changes decisions. Book profit is the profit per the books for a period, before certain adjustments: it counts credit sales as revenue and depreciation as an expense, whether or not cash moved. Net profit is the final figure after tax and appropriations. Cash profit counts only actual cash in and out.
Two consequences follow. First, a business can show a healthy book profit and still run out of cash, because profit parked in unsold stock and unpaid invoices does not pay bills. Second, some tax systems key off the book figure: in India, Minimum Alternate Tax is computed on book profit with statutory additions and deductions, and unrealised gains, assets worth more than you paid but not yet sold, are also called book profits and are generally not taxed until they are realised.
What competing pages miss
Search for this term and you mostly find explanations, not tools. The gap is consistent across the results we reviewed.
Miss 1: no working calculator at all. Accounting explainers walk through one static trading example in prose, and publishing income guides price one platform's royalties. Neither lets you enter your own stock figures or your own per-copy costs. Both tabs here are live calculators with copy and share on every result.
Miss 2: one meaning only. Royalty calculators answer the publishing question for a single platform's current rates and cannot touch the trading account question at all. Accounting pages do the reverse. This page states both meanings up front and gives each its own formula, instead of letting one set of searchers leave with the wrong arithmetic.
Miss 3: royalty dressed up as profit. Platform royalty tools stop at what the platform pays you, before your marketing and other costs. The publishing tab deducts them, because a launch that earns $6,000 in royalties and spent $6,500 to happen did not make a profit, whatever the royalty statement says.
Frequently asked questions
The profit shown in the profit and loss account: all revenues minus all expenses for the period, including non-cash items such as depreciation and credit sales. The trading tab computes the trading version of it, where the expense side runs through cost of goods sold: opening stock plus purchases minus closing stock.
Cash profit counts only actual cash flows. Book profit also counts credit sales, accrued income and non-cash expenses like depreciation. Convert with: cash profit = book profit + non-cash expenses - non-cash revenues. A firm can be profitable in the books and short of cash at the same time.
Not exactly. Book profit is profit as per the books before certain adjustments; net profit is the final figure after tax and appropriations. The two are close but used for different purposes, and some tax computations, such as India's Minimum Alternate Tax, start from book profit specifically.
A gain on paper: an asset worth more than you paid, but not yet sold. It can vanish if prices fall and is generally not taxed until realised. Unsold stock sitting at a higher valuation is the everyday trading example of the same idea.
Net profit divided by copies sold. In the publishing tab the tool shows it automatically alongside total profit and margin. In the worked example, $6,000 of net profit across 1,000 copies is $6.00 per book, which is the figure to compare against other editions and prices.
Per copy, since platforms and distributors take their cut on every sale. Enter the per-copy fee and the tool scales it by copies sold. A flat $3,000 fee on 1,000 copies and a $3 per-copy fee look identical at that volume and diverge the moment sales change, which is why the per-copy entry is the honest one.
Ebooks often reach 50% to 70% margins in this calculator because production cost per copy is near zero, as the 60% worked example shows. Print editions run lower, typically 40% to 60% before marketing is counted, depending on print and distribution costs. Judge your own margin after marketing, not before it.
The trading tab fits businesses that buy and sell goods, because its formula runs through stock. Service businesses should use revenue minus operating expenses directly, which is the same book profit idea without the stock adjustments. Entering zeros for stock in the trading tab would distort the cost of goods sold line.
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References
- Amazon Kindle Direct Publishing, "eBook Royalties" (KDP Help) - the official 35% and 70% royalty options, delivery costs and territory rules behind the platform fee discussion. Amazon KDP Help: eBook Royalties. Accessed October 2026.
- HMD Publishing, "How Much Do Self Published Authors Make Per Book" - per-book earnings by format and platform, with ebook and paperback worked examples and break-even volumes. HMD Publishing: Self-Published Author Earnings Guide. Accessed October 2026.
- Chapter, "Book Royalties Calculator: How to Calculate Your Earnings" - royalty tables by price point for Amazon KDP and a self-published versus traditional per-copy comparison. Chapter Blog: Book Royalties Calculator Guide. Accessed October 2026.
- Inkfluence AI, "How to Self-Publish on Amazon KDP: Steps, Royalties and Print Costs" - KDP royalty tiers and print cost figures checked against KDP's own help pages. Inkfluence AI: Self-Publishing on Amazon KDP. Accessed October 2026.
- Book Business KDP Amazon, "KDP Royalties 2026: 60% vs 50% at $9.99, Print Cost, Real Math" - print royalty tiers, delivery fees and worked royalty arithmetic from KDP Help. Book Business: KDP Royalties Explained. Accessed October 2026.