Digital Marketing ROI: How to Measure ROAS, CAC and LTV

Plenty of businesses spend on advertising and then ask, "Did the marketing work?" with no number to answer them. The problem is that they are spending on what they do not measure.

The great advantage of digital marketing is that it is precisely measurable: every SAR 1 you spend can be traced to what it brought back. Once you measure, marketing shifts from a gamble on luck to a calculated investment, one that pushes money toward what earns and pulls it away from what loses. Measurement is the first step toward spending intelligently.

Return on ad spend (ROAS) is the single most important metric: how much revenue each SAR 1 of advertising brought in.

• ROAS = revenue generated by the campaign ÷ cost of the campaign.

• A ROAS of 4 means every SAR 1 of advertising brought in SAR 4 of revenue.

The higher it climbs, the more efficient the campaign. But be careful: ROAS measures revenue, not profit. A campaign with a high ROAS can still lose money if the product margin is thin. Always read it alongside your margin.

Customer acquisition cost (CAC) answers one question: what does it cost you to add a new customer?

• CAC = total marketing spend ÷ number of new customers acquired.

If you spend SAR 10,000 and bring in 50 customers, your customer acquisition cost is SAR 200. That figure on its own is not enough to judge by. It can be high and still acceptable if the customer generates several times that amount over the long run, which is where lifetime value comes in.

Conversion rate is the share of visitors who complete the action you want, such as a purchase or a sign-up, out of all visitors.

• A conversion rate of 2% means 2 out of every 100 visitors bought.

Tracking the customer journey from ad to visit to purchase shows you where customers leak out. Is the ad attracting people who were never interested? Is the product page putting them off? Improving each stage multiplies the result of the same spend without raising the budget.

The real verdict on marketing comes from comparing customer lifetime value (LTV) against the cost of acquiring that customer (CAC):

• LTV = the total a customer spends with you across the whole relationship.

• The healthy rule: LTV should sit well above CAC.

If acquiring a customer costs SAR 200 and their lifetime value is SAR 1,000, marketing is strongly profitable. If the two figures are level, you are running in place. This ratio is the compass for sustainable growth.

Take a campaign you spent SAR 5,000 on. It brought 100 visits to the store, 20 of which converted into buyers at an average invoice of SAR 400:

• Revenue = 20 × 400 = SAR 8,000.

• ROAS = 8,000 ÷ 5,000 = 1.6.

• CAC = 5,000 ÷ 20 = SAR 250 per customer.

• Conversion rate = 20 ÷ 100 = 20%.

Now you know exactly how the campaign performed, and you can decide whether to repeat it, stop it or improve it based on your margin.

Watch out for these mistakes:

• Measuring revenue instead of profit: a high ROAS on a thin margin can hide a loss.

• Ignoring lifetime value and judging a customer on the first sale alone.

• Failing to tie advertising to actual sales, which leaves the numbers as guesswork.

• Judging too early, before enough data has been collected.

• Splitting the budget evenly instead of concentrating it on the best performers.

Genuine marketing measurement requires tying spend to actual sales, and that is where Snad comes in: it gives you accurate sales, customer, average invoice and repeat purchase data.

From there you calculate customer lifetime value and average invoice from real figures, then compare actual sales revenue against your marketing spend. Instead of estimating campaign returns by gut feel, you build them on reliable sales data that steers your budget toward what genuinely earns.