What Is a Good ROAS for Google Ads in the UK?

A good ROAS for Google Ads depends entirely on your margins, not on a benchmark figure someone published in a blog post. That said, most UK businesses running profitable campaigns sit somewhere between 3x and 8x ROAS, and anything below your breakeven ROAS is losing you money regardless of how the number looks.

Why “Good ROAS” Is the Wrong Question to Start With

ROAS, return on ad spend, tells you how much revenue came back for every pound spent on ads. A 4x ROAS means you got £4 back for every £1 spent. It sounds clean, but it says nothing about whether you actually made money.

If your gross margin is 25%, a 4x ROAS means you broke even. You covered the ad spend, nothing more. If your margin is 60%, that same 4x ROAS is genuinely profitable. The number that matters first is your breakeven ROAS, and most business owners have never calculated it.

How to Calculate Your Breakeven ROAS

The formula is simple:

Breakeven ROAS = 1 divided by your gross margin (as a decimal)

A SaaS business with 70% margins can run at 1.5x ROAS and still profit. A trade supplies company with 22% margins needs 4.5x just to break even. Same ROAS, completely different outcomes.

Before you set a target ROAS in your Google Ads account, or ask an agency whether your campaigns are performing, do this calculation for your own numbers.

What ROAS Benchmarks Actually Look Like in the UK (2025-2026)

Industry averages exist, but treat them as context rather than targets. No authoritative UK-wide ROAS-by-industry dataset is published, so these are rule-of-thumb ranges commonly quoted across UK and European Google Ads accounts, not measured benchmarks:

B2B and service businesses often cannot track ROAS in the traditional sense because the sale does not happen on the website. A solicitor, an accountant, or a commercial cleaning firm is measuring leads and cost per acquisition, not revenue attributed to a click. In those cases, ROAS is the wrong metric entirely. Use cost per lead, cost per qualified lead, and cost per closed deal instead.

Why Your Reported ROAS Is Probably Overstated

Google Ads has used data-driven attribution as the default for new conversion actions since late 2021, but it only shares credit across your Google ad touchpoints, and Smart Bidding optimises towards conversion events that are easier to register. This creates two problems:

1. Assisted conversions get counted as direct conversions. If someone clicked a Google Ad, left, came back via organic search and converted, Google Ads often takes full credit.

2. Micro-conversions inflate the numbers. If you are counting newsletter sign-ups or quote request page views as conversions, your reported ROAS looks healthy while actual revenue is soft.

The fix is to track only revenue-generating events as primary conversions, use Google Analytics 4 alongside your Google Ads data, and cross-reference with actual sales in your CRM or backend. If your Google Ads dashboard says 6x ROAS but your bank account does not reflect it, attribution is lying to you.

What a “Good” ROAS Target Looks Like in Practice

For most UK businesses, a sensible way to set targets is:

• Breakeven ROAS is your floor. Never let campaigns run below this consistently.
• Target ROAS should be breakeven plus enough margin to cover overheads and profit. If your breakeven is 4x and you want a 15% net margin on ad-driven revenue, your target ROAS is closer to 5x to 6x.
• Stretch ROAS is what you aim for once campaigns are optimised. Some mature Google Shopping campaigns for high-margin eCommerce businesses reach 8x to 12x. These are not starting points.

For lead generation campaigns where you cannot directly track revenue, set a target cost per lead based on your average deal value, close rate, and required margin. If your average client is worth £3,000 and you close 1 in 5 leads, a lead is worth £600 to you. If you need a 30% margin, you should pay no more than £420 per lead.

The Mistakes That Destroy ROAS

These are the most common reasons UK businesses see poor ROAS on Google Ads:

• Broad match keywords without proper negative keyword lists. You are paying for traffic that has no intention of buying.
• Sending ad traffic to a homepage instead of a dedicated landing page. Conversion rates drop, cost per conversion rises, ROAS falls.
• Smart Bidding set to Target ROAS too early, before there is enough conversion data. Google’s stated minimum for Target ROAS on Search and Shopping campaigns is 15 conversions in the past 30 days, and it recommends around 50 for the algorithm to optimise reliably. Push a target ROAS before that and the algorithm restricts spend or bids on the wrong signals.
• Tracking form submissions as conversions but not filtering out spam or unqualified enquiries. Your reported ROAS looks fine; your actual revenue does not match.
• Not segmenting campaigns by margin. Running a campaign that mixes a 60% margin product with a 20% margin product under one ROAS target means you are either overpaying for low-margin sales or underbidding on high-margin ones.

How to Improve ROAS Without Just Cutting Budget

Cutting spend is not a ROAS strategy. Here is what actually moves the number:

• Improve your landing page conversion rate. A page converting at 4% versus 2% halves your cost per conversion and doubles your ROAS with no other change.
• Tighten keyword intent. Exact and phrase match on high-intent terms costs more per click but converts far better than broad match volume.
• Use audience layering. Bid more aggressively on audiences with known purchase behaviour or who have visited high-intent pages on your site.
• Run search term reports weekly and add negatives. Wasted spend on irrelevant queries is the fastest way to bleed ROAS.
• Segment by device if data supports it. Many B2B campaigns convert significantly better on desktop. If mobile is eating budget at poor conversion rates, adjust bids accordingly.

Should You Give Google a ROAS Target in Your Bidding Strategy?

Target ROAS (tROAS) bidding is worth using once you have clean conversion data and volume. The conditions that need to be true first:

• At least 15 conversions tracked in the past 30 days (Google’s stated minimum for Search and Shopping), and ideally closer to 50 for reliable optimisation.
• Conversions are tracking actual revenue or a close proxy, not just clicks on a thank-you page.
• You have a realistic sense of your conversion value, either from imported eCommerce data or manually assigned values for lead types.

If these are not in place, Max Conversions with a target CPA is usually safer while you build data. Moving to tROAS too early either starves campaigns of impressions or drives low-quality volume to hit the ratio.

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