AdsMath: Maximum CPA, CAC & Break-Even ROAS Calculator
Find your acquisition limit before increasing your ad budget. AdsMath Simulator + Decision Guide for €49 once.
Before your next €1,000 in ad spend
How much can you afford
to spend on ads and still
make money?
Find the acquisition cost your orders can support. See what you keep, what needs to change and whether the next budget increase makes sense.
Get AdsMathOne-time payment · No subscription · Works in your browser
Already purchased? Open calculator
Watch the numbers
change the decision.
The real AdsMath calculator. Change an input. Follow what happens to your economics.
The actual calculator · Continuous mobile layout
Before the next campaign. Before the next €1,000.
Your campaign can look healthy.
Your margins can tell another story.
Before another budget increase, connect the number in your ad account to the money each order leaves behind.
Same ROAS. Different economics.
Two €200 orders, both acquired for €50. Variable costs decide what remains.
Store A 4× ROAS
55% margin before ads
Left after ads€60
Store B 4× ROAS
25% margin before ads
Left after ads€0
The same ROAS leaves very different amounts to run the business.
A worked example
€5,000 in sales.
€350 left.
Would you raise the budget?
That’s the modeled result from €1,200 in ads and 50 orders. Here’s where each €100 order goes.
One €100 order€7 left
You wanted €13 left.You’re €6 short per order.
See the inputs behind this example
- Cost per click
- €0.48
- Conversion rate
- 2%
- Average order value
- €100
- Margin before ads
- 31%
- Desired contribution
- 13% / €13
Illustrative model, not a customer result. One order per new customer is assumed. The €350 is before fixed costs and tax.
Modeled ad cost per order€0.48 ÷ 2%€24
Break-even ceiling€100 × 31%€31
Target acquisition cost€31 − €13 desired contribution€18
Contribution after ads€31 − €24 modeled ad cost€7
The story behind AdsMath
It started with a Google Sheet.
I’ve used this sheet in hundreds of calls to show how ad spend, CPC, conversion rate, order value and margin work together. We’d change one number and see what happened to the rest. The reaction I heard many times:
“No one has ever explained it this way.”
AdsMath grew from that sheet. A downloadable version is included with your calculator.
One practical tool
Your numbers.
Your next decision.
One browser-based calculator, with the explanation beside the result. Open it with your store numbers and a decision to make.
Connect the whole model
Clicks → orders → revenue → acquisition cost → contribution. One connected model.
Understand the answer
See what the result means, what it leaves out and what to check before acting.
Test the next move
Test changes to CPC, conversion, order value and margin without rebuilding your model.
The existing Decision Guide is also available inside the paid product for reference. Calculator outputs are estimates based on the inputs you enter.
The person behind AdsMath
Built by
Florian Coman.
Performance marketer.
Founder of Scaling ROAS.
Built from the questions that matter when managing ad spend: what can an order afford, what needs to remain, and which assumption has to change?
About 12 yearsManaging Google & Meta ads
100+Accounts managed
~$5MAd spend managed*
*Approximate career figures based on Florian’s advertising work.
Florian / Scaling ROAS professional background
The practical details
Before you buy.
Will it work for my business?
It is built primarily for ecommerce and first-order economics. It models ad cost per order. Treat that as new-customer CAC only when those orders are new customers. Repeat purchases and lifetime value are not automatically included.
How do I get access?
Follow the access instructions delivered after successful payment. AdsMath runs in your browser on desktop and mobile. No software installation or ad-account connection is required.
Is €49 a subscription?
No. It is a one-time digital purchase. Access and availability follow the Terms of Use; any applicable taxes and the final total appear at checkout. See the refund policy before buying.
Does it guarantee more profit?
No. Results depend on your inputs. Contribution after ads still needs to cover fixed costs and tax. Check actual costs and performance before making a spending decision.
Before the next campaign or budget increase
Ads running today?
Run the numbers today.
The useful time to find a gap is before you put more money behind it.
€49 once
Get AdsMath · €49 Calculator + decision guidance · No subscription
Desktop & mobile · No ad-account connection
Any applicable taxes and the final total are shown at checkout. See the refund policy and terms.
