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TG3 SaaS/Glossary/Return on ad spend
SaaS metrics glossary

What is return on ad spend?

Return on ad spend or ROAS, is the blunt test of whether your paid marketing pays for itself. It answers one question. For every dollar in, how many come back?

Definition
Return on ad spend is revenue generated divided by ad spend, shown as a ratio or multiple. Spend $20,000 on a campaign that drives $80,000 in revenue and your ROAS is 4 or 4 to 1. It measures campaign efficiency before you fold in the rest of your cost base.

ROAS is the fast read, not the full picture. It ignores the cost of the team, the tools and the discounts that close the deal. In SaaS the trap is bigger still. ROAS counts first-order revenue but the real return is the lifetime value of a subscription that renews for years. A 2 to 1 ROAS can be a winner once you count renewals.

How to calculate it

How to calculate return on ad spend.

Return on ad spend = revenue from ads / cost of ads
Revenue from ads: sales attributable to the campaign in the measurement window.
Cost of ads: media spend, sometimes loaded with creative and agency fees.
Window: the period you attribute revenue over, critical for subscription products.

Test a campaign with the free ROAS calculator. Enter spend and revenue and it returns the ratio plus the break-even point.

Benchmarks

What a healthy return on ad spend looks like.

The rule of thumb is 4 to 1 but that comes from ecommerce and it lies in SaaS. Ecommerce earns the revenue once. A SaaS subscription earns it again every renewal, so a 2 to 1 first-order ROAS on a product with 90% annual retention is genuinely profitable by month 18.

Judge ROAS against payback, not a fixed target. The honest question is how long until the campaign pays back loaded CAC and whether lifetime value clears it three times over. Channels that look weak on day-one ROAS often win once you account for the renewals they bring.

How to improve it

Three levers that lift return on ad spend.

01

Fix the landing page before the bid

Most ROAS problems are conversion problems wearing a media-cost costume. Doubling landing-page conversion does the same thing to ROAS as halving your cost per click and it is usually easier.

02

Cut the spend that never converts

Audit by keyword and audience, not by campaign. A handful of terms usually burn budget with zero pipeline. Killing them lifts blended ROAS overnight without touching the winners.

03

Count the renewal, not just the first sale

Wire subscription revenue back into your ROAS reporting. Channels that look marginal on first-order revenue often clear the bar comfortably once a year of renewals lands.

Common questions

Questions about return on ad spend.

How do you calculate ROAS?+

Divide the revenue a campaign generated by what you spent on it. A campaign that brings $80,000 on $20,000 of spend has a ROAS of 4, written 4 to 1.

What is a good ROAS for SaaS?+

Lower than the ecommerce 4 to 1 rule, because subscriptions renew. A first-order ROAS of 2 to 1 or 3 to 1 is often profitable in SaaS once you account for retention and lifetime value.

What is the difference between ROAS and ROI?+

ROAS measures revenue against ad spend only. ROI measures profit against total cost, including team, tools and overhead. ROAS is the campaign read. ROI is the business read.

Why is ROAS misleading in SaaS?+

Because it counts the first payment, not the subscription. A campaign with a weak first-order ROAS can be one of your best channels once renewals over two or three years are counted.

Should I optimise for ROAS or CAC payback?+

CAC payback, usually. ROAS is a useful quick read on a single campaign but payback period tells you how fast the cash comes back, which is what protects runway.

ROAS calculatorCustomer acquisition costCAC payback periodAll definitions

Paid channel not paying back?

If ROAS looks fine but the bank balance does not, the gap is usually attribution or retention. Book a 30-minute audit and we will trace where the spend really goes. No sales sequence.

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