Measure whether your ad spend is returning real profit. Compare channels, account for product margins and fees, and see your break even ROAS at a glance.
ROAS
4.00x
ROI
300%
CPA
$12.50
Conv. Rate
5.00%
Forecast for this scenario
New Spend
$3,000
Est. Revenue
$12,000
Profit
$9,000
Keep spend level to hold revenue near $10,000.
Return on ad spend is the number advertisers quote, but the raw ratio hides the parts that decide profit. A campaign can show a healthy ROAS and still lose money once product cost, merchant fees, and returns are counted. The gap between revenue and profit is where most scaling mistakes happen.
Break even ROAS is the line that separates growth from loss. It is the ratio you must clear after all costs to stay profitable. When you know that number, every campaign decision becomes clearer: raise bids on channels that clear it, cut spend on channels that do not, and test creatives against a threshold that actually means something.
A channel with a lower ROAS but higher margins may beat a higher ROAS channel with thin margins. By entering the same cost structure for each channel, you see which mix of Google, Meta, and other platforms truly funds your growth.
Enter your ad spend and revenue for the channel you want to evaluate, then add your product margin and merchant fee rate. The calculator works out the true profit after costs and shows the ROAS you achieved alongside the break even ROAS you needed.
The comparison table lets you add multiple channels so you can see them side by side. Use it before you shift budget, not after. If a channel is below break even, the tool tells you how much the ratio needs to improve, or what margin change would make it work.
Run the numbers monthly and watch the trend. ROAS moves with seasonality, creative fatigue, and auction pressure. Tracking the same metrics over time turns the calculator from a one off check into the dashboard that keeps your ad spend honest.