A lower ebook price can increase unit sales, but more units do not automatically create more profit. An effective promotion begins with a defined objective and a simple model of royalties, advertising cost, read-through, and follow-up value.
This guide uses current U.S. KDP rules as of October 23, 2026. Marketplace terms and platform policies can change. Verify the current KDP help pages and the estimates shown in your own account before scheduling a deal.
Choose the Promotion's Primary Objective
A promotion can pursue direct royalty, series entry, newsletter growth through an appropriate in-book invitation, review visibility, backlist discovery, or a launch milestone. Select one primary objective and a few guardrail metrics.
“Sell as many copies as possible” is incomplete. A free campaign can maximize downloads while producing no sale royalty. A modest discount may sell fewer units but preserve contribution per customer.
Know the Current Royalty Structure
KDP offers 35% and 70% ebook royalty options subject to eligibility and territory rules. In the United States, the standard 70% list-price range became $2.99 through $12.99 effective July 7, 2026. Delivery costs apply to eligible 70% sales and vary with file size.
A simplified eligible U.S. calculation is:
Royalty per sale = royalty rate × (price minus applicable tax and delivery cost)
Use the KDP pricing page and your Bookshelf estimate for an actual title. Do not treat a headline percentage as the final cash amount.
Calculate the Unit Break-Even Point
Let the regular royalty per sale be R and the promotional royalty per sale be P. To replace the royalty from one regular-price sale, required promotional units equal R divided by P.
Example: if a regular sale yields an estimated $3.40 and a promotional sale yields $0.35, the promotion needs about 9.72 units for the same royalty. Since partial sales do not exist, round up to 10 units.
This is only a model. Taxes, delivery costs, territories, price matching, refunds, and changing royalty eligibility can alter actual results.
Add Fixed Campaign Cost
If advertising, a newsletter placement, design, or other promotion costs C, the direct-sale break-even units are:
Break-even promotional units = campaign cost ÷ promotional royalty per sale
A $100 campaign earning $0.35 per promotional sale needs about 286 sales to cover the campaign cost from those sales alone. That calculation does not include labor, taxes, or downstream sales.
Model Series Read-Through Separately
For a series entry promotion, later-book royalties can change the economics. Estimate read-through at each step using actual catalog data where available.
A simple expected downstream value is the sum of each later book's royalty multiplied by the probability that a promotional reader reaches it. Keep the estimate conservative and separate observed data from assumptions.
Do not count every download as a reader. Free and deeply discounted acquisitions often include people who never open the book.
Understand Kindle Countdown Deals
Kindle Countdown Deals are available for eligible Kindle ebooks enrolled in KDP Select and run on Amazon.com or Amazon.co.uk. KDP currently allows a maximum seven-day deal and requires the book to have been enrolled for at least 30 days.
On Amazon.com, the regular price must generally be between $2.99 and $24.99 for Countdown eligibility, the discount must be at least $1, and the regular price must remain unchanged for 30 days before and 14 days after the deal. A qualifying title using the 70% option can retain that rate at a promotional price below $2.99, with applicable delivery costs.
KDP Select is a 90-day program and requires digital exclusivity for the enrolled Kindle ebook. Confirm that tradeoff before enrolling.
Understand Free Book Promotions
An eligible KDP Select ebook can be offered free for up to five days during each 90-day enrollment period. KDP pays no sale royalty during the free period.
Free can be useful when the business case depends on series read-through or another measurable reader path. It is not automatically effective because the download count is large.
Compare Three Scenarios
Build a table for regular price, paid promotion, and free promotion. Include:
- Price and estimated royalty per sale
- Expected units or downloads
- Promotion and advertising costs
- Estimated downstream series value
- Expected refunds or unreads if you track them
- Net direct contribution
- Primary nonfinancial objective
Mark assumptions clearly. A spreadsheet is useful, but precision in the cells does not make the assumptions certain.
Protect the Price Calendar
Price changes can take time to appear across marketplaces, and Countdown Deals have timing restrictions. Schedule backward from the promotional date, confirm marketplace time zones, and avoid overlapping campaigns that depend on conflicting prices.
KDP states that a Countdown Deal must be scheduled at least 24 hours before it begins and cannot be edited or canceled within 24 hours of the start or during the promotion.
Prepare the Conversion Path
Before driving traffic, verify the cover, description, categories, sample, series order, author page, and A+ Content where used. The promotion changes price; it does not repair unclear positioning.
For a series, make the next book easy to identify. For a standalone, use a relevant, permission-based next step rather than an unrelated offer.
Track Results Without Overclaiming
Record baseline units, promotional units, royalties, ad spend, pages read where applicable, later-book sales, email signups, and refunds over a defined window. Keep sales, configured conversions, and collected revenue separate.
Compare with a similar prior period, but note other changes such as seasonality, advertising, reviews, new releases, or media coverage. One promotion rarely proves a universal price strategy.
Use a Post-Promotion Decision Rule
Decide in advance what result would justify repeating the promotion. The threshold may be positive direct contribution, a target acquisition cost for a verified series reader, or improved backlist read-through.
If the campaign misses, identify whether the problem was reach, conversion, price, product fit, timing, or downstream value. Do not conclude that all discounts work or fail from one result.
The math behind a price promotion is simple enough to model and uncertain enough to demand humility. Use current platform rules, conservative assumptions, and actual post-campaign data. A promotion is effective when it advances a defined catalog objective at an acceptable cost.
Official KDP Resources
- Kindle Countdown Deals
- Free Book Promotions
- Digital Book Pricing
- eBook List Price Requirements
- KDP Select
Separate Revenue, Contribution, and Lifetime Value
Gross retail value is not the author's revenue. Royalty is not profit. Contribution subtracts the promotion costs directly associated with the campaign. Lifetime value adds later expected contribution from the acquired reader, but only when it is based on observed behavior or a clearly labeled assumption.
Use separate rows for each measure. Combining them into one optimistic number makes a campaign appear more certain than it is.
Account for Advertising Efficiency
If paid ads support the deal, track impressions, clicks, spend, attributed orders where available, and the attribution window. Cost per click equals spend divided by clicks. Advertising cost per attributed order equals spend divided by attributed orders.
Attribution reports do not capture every influence and may include marketplace-specific timing. Use them consistently rather than treating them as a complete customer history.
Model a Paid Discount
Assume a promotional royalty of $0.70, campaign cost of $140, and 260 promotional sales. Direct royalty is $182. Direct contribution before other expenses is $42. If the title usually earns $3.40 per regular sale, the same 260 units at the regular royalty would represent $884, but that is not the correct baseline unless 260 regular-price sales were realistically expected.
Compare with an observed baseline for the same duration, then note seasonal and advertising differences.
Model a Free Series Entry
Assume 3,000 free downloads, 20% estimated opens, 35% completion among openers, and 15% purchase of Book Two among completers. That produces an estimate of 31.5 Book Two purchases before rounding. If Book Two earns $3.00 per eligible sale, estimated downstream royalty is $94.50.
Every rate in that chain is uncertain. Replace assumptions with actual series data when possible and show a low, base, and high case instead of presenting the middle estimate as fact.
Use Sensitivity Analysis
Test what happens when promotional units, ad cost, read-through, and later-book royalty change. Identify the variable that most affects the outcome. A free campaign may depend almost entirely on read-through; a standalone discount may depend on direct conversion and ad cost.
This shows which metric must be monitored and where a small improvement has real economic value.
Consider Cannibalization Carefully
Some discounted sales may come from readers who would have paid the regular price. Others would never have purchased without the promotion. The split is rarely observable for an individual campaign.
Use a baseline range rather than pretending to know the exact number. A long promotion aimed at an existing audience may carry more cannibalization risk than a short campaign reaching new readers.
Plan the Measurement Window
Record results during the deal, immediately after it, and through a reasonable follow-up period for series effects. Keep the windows consistent across comparable campaigns. A seven-day deal may influence later-book sales after the discount ends.
Do not extend the window indefinitely until the campaign appears successful. Decide the evaluation period before launch.
Price Promotion Worksheet
- Regular price and estimated royalty per eligible sale
- Promotional price and estimated royalty per eligible sale
- Baseline units for the same duration
- Expected promotional units or free downloads
- Advertising, newsletter, design, and service costs
- Observed or assumed open, completion, and read-through rates
- Later-book royalty and expected downstream contribution
- Low, base, and high scenarios
- Measurement window and repeat threshold
Preflight Before Scheduling
- KDP Select enrollment and exclusivity are confirmed where required.
- The title has met the Countdown enrollment and price-stability windows.
- The marketplace, start time, end time, and time zone are correct.
- The product page and series order have been checked.
- Tracking links and campaign costs are documented.
- No sales, ranking, review, or revenue guarantee is used in promotion copy.
- A post-campaign review date is on the calendar.
A spreadsheet can make the campaign disciplined, but it cannot remove uncertainty. The purpose of the model is to expose assumptions, define acceptable cost, and make the next pricing decision better informed.
Frequently Asked Promotion Questions
Is a $0.99 promotion always on the 35% royalty plan?
Ordinary pricing below the 70% range generally uses the 35% option, but eligible Kindle Countdown Deals can retain the selected 70% rate at a promotional price below $2.99, subject to KDP rules and delivery costs. Verify the title's displayed estimate.
Can a book use a Countdown Deal and free days in one Select term?
KDP currently allows one promotion type per 90-day KDP Select enrollment term: either a Kindle Countdown Deal or Free Book Promotions. Unused promotional opportunities do not roll over.
Should a standalone book ever be free?
Possibly, but it needs a measurable objective beyond direct royalty because free sales earn none. Evaluate audience fit, later value, campaign cost, and the risk of collecting low-intent downloads.
What is the most important metric?
The metric tied to the objective. A series campaign may prioritize qualified read-through; a standalone paid discount may prioritize contribution after promotion cost. Units alone are rarely enough.
Close the Reporting Loop
After the evaluation window, save the planned assumptions beside the actual results. Record what changed during the campaign and choose one decision: repeat, revise, stop, or test again under a clearly different condition. A campaign report should improve the next decision, not merely celebrate a large number.
Your Next 30 Minutes
Enter the regular royalty estimate, proposed promotional royalty estimate, campaign cost, baseline units, and expected promotional units into a worksheet. Calculate direct contribution for the baseline and promotion. Add downstream value only in a separate row with its assumption labeled. Then run a low case with fewer units and weaker read-through. If the promotion is unacceptable in that plausible case, revise the price, cost, or objective before scheduling. Save the assumptions now so the later campaign report can compare prediction with result.
Record the Decision
Before treating the work as finished, save the evidence reviewed, assumptions made, decision reached, owner, and next review date. Keep proposed actions separate from completed ones, and keep platform activity separate from verified sales or collected revenue. This short record prevents a future launch team from repeating the same research or mistaking an old rule for a current one. It also creates a clean point for improvement: when new evidence arrives, compare it with the original assumption, update the relevant asset, and document what changed.