What is blended ROAS and why does it matter?

Calculate blended ROAS, compare it with platform attribution, and understand what the number can and cannot tell you.

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Blended ROAS compares total business revenue with total advertising spend over the same period. It gives you a business-wide view without adding together revenue claims from individual ad platforms. Define your revenue and spend consistently before comparing one period with another.

How do you calculate blended ROAS?

Blended ROAS = total revenue ÷ total advertising spend. Use one reporting period and currency. State whether revenue includes tax, shipping, refunds and cancelled orders, and whether spend includes fees. Keep that definition attached to every report.

For example, imagine a business records £120,000 in revenue and £30,000 in advertising spend during September. Its blended ROAS is 4.0×: £4 of revenue for every £1 spent on advertising. These are illustrative figures, not Aurora customer results.

Why can platform ROAS tell a different story?

An ad platform reports revenue attributed under its own tracking settings, attribution model and conversion window. Different platforms can claim credit for the same purchase. Adding their reported revenue together can therefore overstate the revenue your business actually received.

Blended ROAS instead starts with your order, billing or finance records. Include all advertising spend in the denominator, including channels whose conversions are difficult to track. Reconcile currencies and reporting time zones before comparing totals.

What does blended ROAS leave out?

  • It does not prove that advertising caused every sale. Revenue can include repeat purchases, organic discovery, referrals and other activity.
  • It does not identify which campaign deserves more budget. Use campaign-level reporting and controlled tests for that decision.
  • It does not measure profit. Product costs, fulfilment, refunds, payment fees and operating costs still matter.
  • It can move because of changes in the business mix, even when advertising performance is unchanged.

How should you use it alongside other metrics?

  1. Reconcile revenue against a consistent business record and total spend across all advertising platforms.
  2. Track blended ROAS alongside contribution margin, new-customer acquisition cost and the share of sales from returning customers.
  3. Investigate changes using platform reporting, creative results and conversion tracking. Treat attribution as a way to assign credit, not a direct measure of causation.
  4. Compare periods with similar promotions and seasonality, and allow for the time between an ad click and a purchase.

What is a good blended ROAS?

There is no universal target. A useful threshold depends on your margins, repeat-purchase behaviour and growth objectives. A 4× return can be attractive for one business and insufficient for another. Agree a target with the people responsible for the business economics, then use a stable reporting definition to measure progress.

Is blended ROAS the same as MER?

Teams sometimes use marketing efficiency ratio, or MER, for the same calculation. Others include a wider set of marketing costs in MER. Check the numerator and denominator rather than relying on the label, and avoid comparing ratios built from different cost definitions.

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