How ROAS actually works
ROAS is a channel-level ratio. You take the revenue Google Ads (or Meta, or Amazon) claims it drove and divide by what you spent. Sounds simple. The traps are in the numerator. Platform-reported revenue includes attribution-modelled sales, view-through conversions, and often double-counts against other channels. A ROAS of 4.0 on the Google Ads dashboard can be a real ROAS of 2.4 once you strip out sales that would have happened anyway.
Healthy ROAS depends on your margin
There is no universal healthy ROAS. A 3.0 ROAS is profitable at 40 percent gross margin and loss-making at 20 percent gross margin. The break-even calculation is simple: break-even ROAS equals 100 divided by your margin percent. At 25 percent margin, break-even is 4.0. Anything above 4.0 makes contribution profit. Anything below is losing money before you count overhead, unless repeat purchases earn it back later, which is what an LTV:CAC ratio calculator is for.
What is a good ROAS?
A good ROAS is one above your break-even ROAS, with enough room left over to cover overhead and profit. For most ecommerce brands that means somewhere between 3x and 5x, but only your margin decides the real line: at 40 percent gross margin, break-even is 2.5x, so 3.5x leaves a working cushion. For reference, these are averages from the ecommerce accounts iClick manages, not an industry survey: Shopping ROAS averages 320% (3.2x) in fashion and 390% (3.9x) in health and beauty, and 480% (4.8x) across well-managed Google Shopping accounts. The full tables are in our PPC benchmarks report. To find your own line, use the break-even ROAS calculator, then check your current number with the ROAS calculator.
ROAS vs MER (blended metric)
ROAS is channel-specific. MER (marketing efficiency ratio) is your entire revenue divided by your entire marketing spend, across every channel. A brand can have a great Google Ads ROAS and a terrible MER if the two channels are cannibalising each other or if unattributed revenue is being over-credited. On accounts spending $100K+ a month, iClick optimises to MER first and channel ROAS second.
Common ROAS mistakes
The three most expensive ROAS mistakes we see: (1) using platform-reported ROAS without validating against Shopify or GA4; (2) setting a fixed target ROAS across every SKU when margin varies from 15 to 60 percent; (3) chasing a high ROAS by pulling budget from prospecting, which starves the top of the funnel and slowly kills the account over 60 to 90 days.
