What Is ROAS?
Return on Ad Spend (ROAS) is a marketing metric that measures the revenue generated for every rand spent on advertising. It is calculated by dividing total revenue attributed to ads by total ad spend. If you spend R10,000 on Google Ads in a month and the campaigns generate R45,000 in tracked revenue, your ROAS is 4.5x (or 450%).
ROAS is the primary efficiency metric for e-commerce and direct response advertising. It tells you whether your campaigns are generating more revenue than they cost and by how much. Unlike ROI, ROAS does not account for the cost of goods, agency fees, or other overheads it measures the raw revenue return on the ad spend itself.
South African advertisers typically set ROAS targets based on their product margins. A business selling high-margin software might be profitable at 3x ROAS, while a retailer with 20% margins might need 6x ROAS or higher to cover costs and generate meaningful profit. Setting the right ROAS target requires knowing your numbers gross margin, customer acquisition cost, and average order value.
Why ROAS Matters for Your Business
ROAS is the clearest signal of whether your advertising is working. A declining ROAS over consecutive months is an early warning sign that needs investigation whether that means rising CPCs due to increased competition, creative fatigue, or a mismatch between your landing page and the ads driving traffic to it.
Tracking ROAS at the campaign and keyword level allows you to scale what's profitable and cut what isn't. South African businesses running Smart Shopping or Performance Max campaigns should pay particular attention to ROAS by product category, as Google often over-invests in high-volume but low-margin products unless explicitly managed.
How do you calculate ROAS?
Return on ad spend is revenue attributable to advertising divided by the cost of that advertising, usually expressed as a ratio. If a Google Ads campaign costs R20,000 in a month and generates R96,000 in tracked sales, the ROAS is 96,000 ÷ 20,000, or 4.8x, meaning every rand spent returned R4.80 in revenue. Accurate ROAS depends on accurate conversion tracking: if sales are under-recorded, ROAS looks worse than reality, and if view-through or assisted conversions are over-counted, it looks better. Agree the attribution rules before judging a campaign, because the same spend can show very different ROAS under different tracking setups.
What ROAS target should you set?
The right ROAS target is the one that leaves an acceptable profit after the cost of what you sell. A business with high margins can be profitable at a 3x ROAS, while one with thin margins may need 6x or more just to break even, because ROAS measures revenue, not profit. Work backwards from your gross margin: divide 1 by your margin to find the break-even ROAS, then set the target above it. This is why a single industry benchmark is unhelpful; a 4x ROAS can be excellent for one business and loss-making for another selling the same-priced product at a lower margin.
Blended ROAS versus campaign ROAS
ROAS can be measured at two levels, and confusing them causes bad decisions. Campaign ROAS looks at one campaign in isolation, useful for judging that campaign but blind to the wider picture. Blended ROAS divides total revenue by total advertising spend across every channel, which captures how paid and organic work together but hides which specific campaigns pull their weight. A campaign can show a modest standalone ROAS yet lift blended results by assisting sales that close elsewhere. Read both: campaign ROAS to optimise individual efforts, blended ROAS to judge whether the whole advertising investment is genuinely growing the business.
FAQ
What is a good ROAS for Google Ads in South Africa?
A good ROAS for Google Ads in South Africa is 3x or higher, meaning you earn R3 for every R1 spent. Juicy Designs achieves an average 4.8x ROAS across 64+ clients in Gauteng.
How is ROAS different from ROI?
ROAS measures revenue relative to ad spend only. ROI accounts for all costs including staff, tools, and overheads. A campaign can have a positive ROAS but negative ROI if operating costs are high.
Does a high ROAS always mean profit?
No. ROAS measures revenue returned per rand of ad spend, not profit. A campaign can show a strong ROAS and still lose money if the product margin is thin or the cost of fulfilment is high. Always compare ROAS against your break-even ratio, not against zero.
How do you improve ROAS?
Improve the conversion rate of the pages ads point to, tighten targeting towards higher-intent audiences, raise average order value, and cut spend on keywords or placements that convert poorly. Better tracking also helps, by crediting sales that were previously missed.