QUICK OVERVIEW
What to take away from the article
- ROAS compares revenue to ad spend, not total profit.
- Calculate the budget limit from the allowance after direct costs.
- Track first purchase, repeat purchase and operating expenses separately.
Three numbers that describe different things
We calculate ROAS as the revenue attributed to the ad divided by the ad spend. A value of 5 means five euros of sales per one euro of advertising. It does not say how much it cost to procure the product, package it, or work on the order. To assess the space for advertising, we therefore need an allowance after direct and variable costs.
Customer acquisition cost, often referred to as CAC, depends on which acquisition costs you include in it. If you only count media, call the result the media spend customer acquisition cost. For the overall CAC, include the relevant work, agency and tools according to the uniform methodology. Otherwise, you are comparing different numbers under the same name. The correct linking of results is followed by measurement of inquiries via CRM.
Fictitious e-shop: where does €10,000 in sales go?
The following model is illustrative and uses amounts excluding VAT on a comparable basis. The e-shop will reach €10,000 in net sales after discounts and already taken into account returns. Cost of goods sold is €6,000 and other variable costs are €1,000. In this second amount, the model includes payment fees, packaging, shipping and handling paid by the store; we don't count any of it a second time.
€3,000 remains before advertising, i.e. 30% of sales. After spending €2,000, €1,000 remains for fixed operation and possible profit. If the associated fixed costs exceed this amount, ROAS 5 alone will not save the company. This is a management model, not a tax or financial statement calculation.
| Area | Postup | What to check |
|---|---|---|
| Net sales | 10 000 € | Comparable sales value after discounts and returns. |
| Goods + variable costs | 7 000 € | €6,000 + €1,000 according to the range mentioned above. |
| Post before advertisement | 3 000 € | 30% of net sales. |
| Advertising | 2 000 € | ROAS = 10,000 / 2,000 = 5. |
| Balance before fixed costs | 1 000 € | Not the net profit of the company. |
How to Calculate Marginal ROAS
If the pre-ad contribution margin is 30%, the simplified marginal ROAS for ad coverage alone is 1 / 0.30, or about 3.33. At this limit, there is no allowance for fixed costs or profit. It is therefore not automatically a suitable campaign target.
If you want to keep 15% of the same sales for fixed operation and planned result, 15% is left for advertising. The target ROAS in this simplified model is 1 / 0.15, approximately 6.67. A condition is a stable composition of orders, costs and comparable sales. Different category margins have to be calculated separately or the actual weighted contribution should be used.
It is not appropriate to mechanically rewrite a model into an ad account if its conversion values include other items. First, reconcile whether the report includes shipping, tax, cancellation and discounts. The same name "sales" does not guarantee the same calculation.
The custom company must also consider capacity
For advertising production or installation, add direct labor hours, material, subcontracting and shipping to the order. A contract won may have a high price but a small contribution if it requires a lot of unpaid repairs and moves. Therefore, also monitor the contribution per capacity hour and the deviation from the offer.
If the installation team is busy, getting more similar orders cheaper may not solve the main problem. The minimum price, region, dates or composition of services may need to be adjusted. Campaigns are supposed to support demand that the company can handle well. The range approval process helps set up guidance on quote and margin protection.
Repeat purchase has value, but must be documented
A firm can afford a different acquisition cost when customers repeat orders. However, don't judge your future benefit based only on your best clients. Track new customer groups by time of first purchase and their actual repeat orders, contribution, and resale costs.
When making a decision, separate the contribution already received from the estimated one. At the same time, think about time: even a returning customer can bring another order up to a year before you pay for the ad today. If the assortment or buying behavior changes, the historical average may not represent the new campaign well. Therefore, show the assumptions and the evaluation interval in the report.
What to watch for when deciding on a monthly budget
Match the advertising report with orders and actual costs. Check net sales, contribution before advertising, spend, new customers, cancellation and available capacity. Compare the numbers at the same definition and allow time for delayed closing of orders.
The output should lead to a decision: which category to support, where to adjust the price and which source of inquiries to limit. If you need a common view of multiple operations, continue with the owner dashboard for multiple businesses article. The growth of one advertising indicator alone should not replace the image of the company's functioning.
