Zera Company

Free calculator

Does your paid traffic profit or burn cash?

Enter how much you invest in ads and how much it generates. The calculator shows your ROAS, cost per customer and real profit on the spot, with the reading of what the number means. No sign-up: the result is yours, on screen.

R$

Media spend only (Google and Meta), no fees.

R$

The revenue that came from ads in the same period.

Optional. Used to calculate your cost per customer (CAC).

%

Optional, but it is what reveals real profit. How much is left from each sale after the cost of the product or service.

Your result

Enter how much you invest and how much it generates to see the result on the spot.

Understand the terms: ROAS · CAC · ROI · LTV

How the math works, no black box

No AI in the math: these are the standard paid-traffic formulas, the way any honest manager runs them.

  • ROAS = revenue divided by ad spend. How many reais came back for each real spent on media.
  • Real profit = revenue times your margin, minus the spend. What actually remains, not gross revenue.
  • CAC = spend divided by number of sales. How much, in media, each customer cost.
  • There is no magic ROAS: what is good depends on your sector and your margin. That is why the verdict looks at real profit when you enter the margin.

Questions about the calculator

Does a high ROAS mean I am profitable?
Not necessarily. ROAS measures revenue per real of ad spend, not profit. A ROAS of 3 at 25% margin profits; the same ROAS of 3 at 15% margin can lose money after product, team and tools. That is why the calculator asks for your margin: it is what turns ROAS into real profit.
Do I need to sign up to see the result?
No. The result shows on the spot, on screen, for free, and you can use it as many times as you like. If later you want an audit with your real numbers and an action plan, then we talk, but the math is free.
Where do these calculations come from?
They are the standard paid-traffic formulas, no black box: ROAS is revenue divided by spend; real profit is revenue times your margin minus the spend; CAC is spend divided by sales. It is all open in the "How the math works" section.
What is a good ROAS?
It depends on your sector and your margin, there is no universal number. A low-margin e-commerce needs a much higher ROAS than a high-margin service to make the same profit. That is why the honest thing is to look at real profit, not ROAS alone.

Want the full reading, with your real numbers?

The calculator gives the snapshot on the spot. In a free audit, we open your ad account and show exactly where the money leaks between the click and the sale.

Get my free performance audit