Free Tool

Book Ad ROI Calculator

See your true advertising ROI — ACoS, ROAS, profit per sale, and break-even point — in seconds.

Ad ROI Calculator

Calculate your advertising ROI

Enter your ad spend and sales figures below. Switch to Advanced mode to include impressions, clicks, and series read-through value.

Campaign Status

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ACoS vs Break-Even

0% Break-Even 100%+

Gross Revenue

—

Sales × price (before royalty)

Royalty Revenue

—

Gross revenue × royalty rate

Profit

—

Royalty revenue − ad spend

ROI

—

Profit ÷ ad spend

ACoS

—

Spend ÷ gross revenue

ROAS

—

Gross revenue ÷ spend

Cost per Sale

—

Spend ÷ attributed sales

Break-Even ACoS

—

= your royalty rate %

Advanced Metrics

CTR

—

Clicks ÷ impressions

CPC

—

Spend ÷ clicks

True Profit (incl. read-through)

—

Profit + (sales × read-through)

True ROI

—

Including read-through

True ACoS

—

Spend ÷ (gross + read-through revenue)

Effective Cost per Reader

—

Spend ÷ attributed sales

Common Questions

Frequently asked questions

What is ACoS in book advertising? +

ACoS (Advertising Cost of Sale) is your ad spend divided by ad-attributed revenue, expressed as a percentage. A lower ACoS means more efficient advertising. For most authors, a break-even ACoS is around 30–70% depending on royalty margin.

What is a good ROAS for book ads? +

ROAS (Return on Ad Spend) of 2x or higher is generally considered profitable for ebooks with 70% royalty margins. That means for every $1 spent on ads, you earn at least $2 in royalties.

How do I calculate my break-even ACoS? +

Break-even ACoS equals your royalty margin percentage. If your book price is $4.99 and your royalty is $3.49 (70%), your margin is 70% — so any ACoS below 70% is profitable.

Should I include read-through when calculating ad ROI? +

Yes — for series authors, the true ROI of an ad includes not just the first book sale but all subsequent books a reader buys. If your series earns $12 per reader on average, your break-even ad spend per reader is $12 × your margin.

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