Campaign performance / a basic metrics check
Free ROAS Calculator
Use ad spend, attributed revenue and attributed orders from the same period to calculate ROAS, cost per order (CPA) and average order value. No signup.
Three inputs. No signup.
Three familiar metrics
Measure the campaign. Then check the business.
Use ad spend, attributed revenue and attributed orders from the same period and attribution source.
The missing question: What does an order leave after variable costs, and how much can you afford to spend to acquire it? ROAS alone cannot tell you.
Basic ROAS & CPA calculator
Calculate ROAS, CPA and average order value.
Enter your results for one period. Change any input to recalculate.
Enter your numbers to see the result.
Use the same currency and period for spend and revenue. CPA here means ad cost per attributed order. Customer acquisition cost (CAC) needs new-customer counts and a defined acquisition-cost scope. These metrics do not calculate profit, break-even CPA or allowable acquisition cost. Attributed sales are not proof of incremental sales.
Want to understand what you can afford to pay for an order? Explore the AdsMath Calculator + Decision Guide PDF.
Understand the economics
Move from campaign metrics to business thresholds.
These guides explain the calculations with worked examples. The basic calculator above remains limited to ROAS, cost per order and average order value.
Find the difference between first-order break-even and the cost per order your target can support.
Translate contribution margin and the amount you want left into a revenue-to-spend threshold.
Compare two businesses with the same reported ROAS and different costs.
From the book · Ads Don’t Fix Weak Math
“Advertising is a magnifier. It accelerates what already exists in your business, good or bad.”
Florian Coman · Ads Don’t Fix Weak Math
The free calculator gives you ROAS, CPA and average order value. AdsMath gives you the full calculator and Decision Guide PDF to work through your own numbers and see what drives profit.
AdsMath by ScalingROAS
What is AdsMath, and who is it for?
AdsMath is a paid advertising economics calculator with a Decision Guide PDF for ecommerce owners and media buyers. It connects traffic cost, conversion rate, order value and contribution margin so you can explore what an order can support in advertising cost. The package costs €49 once, with no subscription.
Your inputs
Ad spend, cost per click, conversion rate, average order value and contribution margin after variable costs. Use a consistent revenue basis and period. The calculator also lets you work toward an amount you want left per order.
Your modeled results
Estimated clicks, orders and revenue; contribution before ads per order; modeled advertising cost per order; target advertising cost per order; and the amount left per order after ads.
What the model does not prove: These are scenarios based on your inputs, not forecasts or guarantees. Contribution after ads is before fixed overhead and taxes. Average cost per order is not necessarily customer acquisition cost: orders can include returning customers. Future purchases, cash flow and incremental sales require separate analysis.
Included in the €49 package
Use the Calculator to explore your assumptions, and the Decision Guide PDF to understand the calculations and the trade-offs behind them.
What you get
- Access to the full AdsMath Calculator
- The AdsMath Decision Guide PDF
- Scenarios using your own ad spend, click cost, conversion rate, order value and contribution margin
- A clearer view of allowable acquisition cost and what is left after ads
- A practical way to test which lever matters most before you raise spend
The full AdsMath version
AdsMath Calculator + Decision Guide PDF
The free calculator gives you ROAS, CPA and average order value. AdsMath gives you the full calculator and Decision Guide PDF so you can test your own numbers and understand what actually drives profit.
Get AdsMath →See the full package on the AdsMath page.
The person behind AdsMath
Hi, I’m Florian.
I’ve worked in advertising since 2001 and with Google and Meta campaigns since 2013. I work with ecommerce and education businesses on paid acquisition, tracking, and the decisions behind their ad budgets.
AdsMath is how I connect campaign performance to the economics of the business: traffic cost, conversion, order value, variable costs, and what remains after ads. The Calculator and Decision Guide PDF help you work through those numbers yourself.
Google Partner · Meta Certified Media Buying Professional
