How Much Should You Spend on Amazon Ebook Ads?

Quick Answer: Start with $5 to $10 per day on your first Sponsored Products campaign. Plan for a 60- to 90-day testing period at $150 to $300 total. Scale budget only on campaigns that are generating sales at an ACoS below your break-even point. The median monthly ad spend among successful indie authors is roughly $250 per month, according to industry survey data.

There is no universal right amount. The right budget depends on your book's price, royalty rate, and how competitive your genre's advertising landscape is.

The Testing Phase (Days 1 to 60)

Your first 60 days are data collection, not profit generation. Start with $5 to $10 per day on an automatic Sponsored Products campaign. The goal is to learn which keywords and competitor books generate clicks and sales for your ebook. Expect to spend $150 to $300 during this phase, and expect some of that spend to be unprofitable. That's normal. You're paying for information.

Calculating Your Break-even

Your break-even ACoS is the point where ad spend equals royalty. Calculate it before setting a budget:

Break-even ACoS = (Royalty per sale / List price) x 100

For a $4.99 ebook at 70% royalty (roughly $3.34 royalty after delivery fee): break-even ACoS is about 67%. For a $2.99 ebook at 70% royalty (roughly $1.94): break-even is about 65%. For a $0.99 ebook at 35% royalty ($0.35): break-even is about 7%, which is nearly impossible to achieve profitably with ads.

Scaling Up

After the testing phase, increase budget only on campaigns with proven profitability (ACoS consistently below your break-even). Increase by $5 per day per week and monitor performance. Most self-published authors settle into a steady-state budget of $150 to $500 per month once campaigns are optimized.

Bottom Line

Start small ($5 to $10/day), test for 60 days, calculate your break-even ACoS before making decisions, and scale only what works. The goal is profitable ad spend, not maximum ad spend. For the full Amazon Ads process, see Amazon Ads for Ebooks: Setup, Management, and Optimization.

Q: Can you run Amazon Ads on a $0 budget? A: No. Amazon Ads require spending money per click. You can minimize spend with low daily budgets ($5/day), but you can't test or learn without some ad spend. Authors with no advertising budget should focus on organic strategies (Amazon SEO, email marketing, social media) first.

Q: Is $5 a day enough for Amazon Ads? A: It's enough to start gathering data. At $0.30 to $0.50 per click, $5/day produces 10 to 17 clicks per day, which is enough to identify which keywords and targets are converting. It's not enough to generate high volume, but it's enough to learn.