Series Read-Through Value
Identify your "Break-Even CPA" by calculating the cumulative revenue a single new reader generates as they move through your series.
Series Parameters
Profit Architecture
—LTV Per Reader
—Break-Even CPA
—Est. Monthly Profit
Yield per Reader per Book
| Book | Probability of Purchase | Ebook Rev | KU Rev | Total Yield | Cumulative Value |
|---|
Strategic Leverage Points
01
The "Cliff" Audit
The transition from Book 1 to Book 2 is your "Cliff." If your read-through here is below 50%, your marketing is leaking money. Focus on sharpening the Hook at the end of Book 1 before increasing ad spend.
02
LTV > CPA = Scale
If your **LTV Per Reader** is higher than your **Current CPA**, you are "buying money." In this scenario, your only goal should be increasing your ad budget until the CPA matches the LTV.
03
The Free-to-Paid Bridge
Setting Book 1 to $0.00 will drop your immediate yield, but it often doubles your reach probability. Use this tool to model how many "free" readers you need to hit your monthly profit goals.
Calculator Intelligence FAQ
How do I find my actual Read-Through rates?
Look at your KDP "Units Sold" report over a 90-day period. Divide (Book 2 Sales / Book 1 Sales) to get your percentage. For KU, use (Book 2 Total KENP / Book 1 Total KENP) adjusted for book length.
What is "Decay Rate" in a long series?
After Book 5, reader drop-off usually stabilizes. This tool applies a 5% "Natural Decay" to books 6 through 20 to account for life distractions and DNF (Did Not Finish) fatigue.
Should I include Print sales in my SRV?
Generally, keep the "Print Share" low (10-15%) unless you are a heavy direct-sales or bookstore author. Most "Series Binging" happens on Kindle and Kindle Unlimited.