How to Calculate Break-even ROAS

The core idea

If gross margin is 25%, only one quarter of revenue is available before other operating costs. That means ad-attributed revenue must be four times ad spend just to cover the advertising expense at the gross-margin level.

Why it matters

A ROAS that looks high can still be unprofitable when product margins are thin.

Limitations

Real profitability also depends on returns, shipping, payment fees, overhead and taxes.

Practical takeaway

Use the metric that matches the business question you are trying to answer. When several metrics describe different stages of the same workflow, compare them together rather than optimizing one in isolation.