KDP Break-Even Calculator

    Calculate exactly how many books you need to sell to break even on your KDP investment — editor, cover, ads and printing all included.

    Last reviewed: July 2026

    Quick answer

    With total upfront cost of $1,500, royalty per book of $4, ad cost per book sold of $1.2, the books to break even is 536. Adjust the inputs below for your own numbers.

    Inputs

    $
    $
    $

    Results

    Net profit per book
    $2.80
    Royalty − ad cost
    Books to break even
    536
    Months to break even
    7.1 months
    Revenue at break-even
    $2,787.20
    Worked example

    With total upfront cost $1,500, royalty per book $4, ad cost per book sold $1.2, expected monthly units 75, this calculator returns books to break even 536 and months to break even 7.1 months.

    Break-even is a launch-day question

    Before publishing, every author should know exactly how many books they need to sell to recover their cash investment. This single number determines whether your launch budget is realistic or fantasy. A $2,000 launch with $3 net profit per book requires 667 sales — achievable in 6 months for a good book in a healthy niche, but a 3-year project in a saturated one.

    What counts as fixed cost

    Include developmental editing, copy edit, proofread, cover design, interior formatting, ISBN if you bought one, ARC distribution and any launch promotion (Bookbub, Freebooksy). Don't include your own time unless you want a true full-cost figure for opportunity-cost comparison.

    Speeding up break-even

    Three levers reduce time-to-break-even: lower the fixed cost (DIY cover for a non-fiction lead magnet), raise net profit per book (higher list price or tighter ads), or increase sales velocity (KU enrollment, launch promo stacks). The biggest lever is usually price — a $2 price bump on 500 sales recovers $1,000 instantly.

    When to walk away

    If your break-even calculation shows more than 24 months at realistic sales velocity, either restructure your launch budget or pick a different niche. Sunk-cost thinking destroys more indie authors than bad writing.

    Frequently asked questions

    Should I include the cost of my time?

    For pure cash break-even, no. For real ROI on your hours, add it — many authors value their time at $25–$75/hour.

    Is break-even before or after tax?

    Before. Add 15–30% to your fixed cost if you want a tax-inclusive figure.

    What if my net profit per book is negative?

    You'll never break even at current prices/ads. Raise the price, cut ad spend, or accept this as a portfolio loss leader.

    Do KU pages-read count?

    Yes — divide monthly KENP earnings by units-equivalent and add to royalty per book.

    Sources & method

    How this is calculated: Net profit per book = royalty − ad cost per sale. Books to break even = upfront cost ÷ net profit per book; months = those books ÷ expected monthly units.

    Source: Amazon KDP Help — Royalty rates & pricing · Estimate based on current KDP rates.

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