Quick Answer:
Calculate Google Ads ROI as (revenue from ads − ad cost) ÷ ad cost, expressed as a percentage. A simpler day-to-day measure is ROAS: revenue ÷ ad spend. As a rough benchmark, average Google Ads ROAS sits near 2:1, so every S$1 spent returns about S$2 in revenue — though this varies widely by industry and depends on accurate conversion tracking.
Google Ads can be highly profitable or quietly wasteful, and the only way to know which is to measure it properly. Many Singapore businesses run campaigns for months without a clear figure for what each dollar returns. That gap is usually a tracking problem, not a maths problem.
This guide shows how to calculate the ROI of your Google Ads campaigns, what counts as a good return, and the mistakes that distort the number — the essentials a sem agency in Singapore uses every day. The formulas are simple; the discipline of tracking is what makes them reliable.
How do I calculate Google Ads ROI?
Calculate Google Ads ROI by subtracting your ad cost from the revenue those ads generated, dividing by the ad cost, and multiplying by 100 for a percentage. Many advertisers also track ROAS — return on ad spend — which is simply revenue divided by ad spend, expressed as a ratio.
ROI (%) = (Revenue from Ads − Ad Cost) / Ad Cost x 100
ROAS = Revenue from Ads / Ad Cost
Worked example:
Spend S$2,000, generate S$6,000 in revenue.
ROI = (6,000 − 2,000) / 2,000 x 100 = 200%.
ROAS = 6,000 / 2,000 = 3:1.
Both describe the same result — ROI as a percentage of profit, ROAS as a revenue multiple.
For a Singapore business, M’ai Digital recommends tracking ROAS for quick daily decisions and true ROI — which accounts for profit margin — for the bigger picture. A sem agency in Singapore lives by these two numbers.
What counts as a good Google Ads ROI?
A good Google Ads ROI depends on your margins, but a common benchmark is a ROAS of around 2:1 (roughly S$2 back for every S$1 spent), with 4:1 or higher considered strong. Industry data shows wide variation, and 2025 saw average ROAS soften across most sectors, so benchmarks are a guide, not a guarantee.
ROUGH ROAS BENCHMARKS (INDUSTRY AVERAGES)
ROAS | What it means | Read |
Below 1:1 | Losing money — revenue is less than spend | Fix or pause |
~2:1 | Break-even to modest profit; common average | Baseline |
3:1–4:1 | Healthy, sustainable return | Good |
4:1 and above | Strong performance worth scaling | Excellent |
The right target depends on margin: a high-margin service can profit at a lower ROAS than a thin-margin retailer. M’ai Digital sets a Singapore business a realistic target based on its economics, not a generic number pulled from a blog.
Why is my Google Ads ROI hard to measure accurately?
Google Ads ROI is hard to measure mainly because of broken or missing conversion tracking — if the account does not record which clicks lead to sales, any ROI figure is guesswork. Without accurate tracking, the platform optimises blindly and reporting overstates or understates true performance.
Other complications include long or multi-touch buying journeys, offline conversions such as phone enquiries, and profit margins that ROAS alone ignores. A campaign can show a healthy revenue multiple yet lose money once cost of goods is included, which is why true ROI matters alongside ROAS.
M’ai Digital’s first step for any Singapore business is to verify conversion tracking end to end, because every later decision depends on it. Accurate measurement is the foundation an online marketing services Singapore engagement is built on.
How do I improve my Google Ads ROI?
Improve Google Ads ROI by cutting wasted spend and lifting conversion value: add negative keywords, tighten targeting, improve landing pages, and shift budget toward the campaigns and keywords that actually convert. Small, compounding efficiency gains usually beat simply spending more.
- Verify conversion tracking — accurate data before any optimisation.
- Add negative keywords — stop paying for irrelevant clicks.
- Improve landing pages — a better page lifts conversion rate and ROI together.
- Reallocate budget — move spend to proven keywords and campaigns.
- Track profit, not just revenue — factor margin into the target ROAS.
M’ai Digital pairs Google Ads management with landing-page and tracking work for a Singapore business, so paid clicks convert instead of leaking. A sem agency in Singapore earns its fee by improving the return, not just running the ads.
Frequently Asked Questions
What is the formula to calculate Google Ads ROI?
ROI equals revenue from ads minus ad cost, divided by ad cost, multiplied by 100 for a percentage; ROAS is simply revenue divided by ad spend as a ratio. For example, S$2,000 spend generating S$6,000 revenue is a 200% ROI and a 3:1 ROAS. The figure is only as reliable as your conversion tracking. M’ai Digital advises a Singapore business to track ROAS for daily decisions and true, margin-adjusted ROI for the bigger picture, since revenue alone can hide a loss.
Is Google Ads profitable for a small business in Singapore?
Google Ads can be profitable when it is tracked and managed well, with average ROAS commonly cited around 2:1, meaning roughly S$2 returned per S$1 spent. Profitability varies widely by industry and margin, and 2025 saw average returns soften, so results are not guaranteed. The deciding factors are accurate tracking and disciplined optimisation. M’ai Digital’s view is that a Singapore business should judge Google Ads on measured ROI, not anecdote, and fix tracking before scaling spend.
What is a good ROAS for Google Ads?
A ROAS of around 2:1 is a common break-even-to-modest-profit benchmark, 3:1 to 4:1 is healthy, and 4:1 or above is strong and worth scaling. The right target depends on your profit margin — a high-margin service can profit at a lower ROAS than a thin-margin retailer. Generic benchmarks are a starting point, not a rule. M’ai Digital sets a Singapore business a target ROAS based on its actual economics as part of an online marketing services Singapore plan.
Why does my Google Ads report show revenue but I'm not making money?
This usually happens because ROAS measures revenue, not profit — a campaign can return revenue while losing money once cost of goods, margins and fees are included. Broken conversion tracking and untracked offline sales distort the picture further. True ROI, which accounts for margin, tells the real story. M’ai Digital’s first step for a Singapore business is to verify tracking and layer profit margin into reporting, so the numbers reflect actual money made, not just revenue booked.
Google Ads ROI is simple to calculate but only as trustworthy as your tracking: (revenue − cost) ÷ cost for ROI, revenue ÷ spend for ROAS. Aim for a margin-adjusted target, verify tracking first, then optimise. To have M’ai Digital measure and improve your Google Ads return, visit mai-digital.sg or email hello@mai-digital.sg.
