If you run paid ads on Google or Meta, one number tells you whether the money is working: ROAS. It sits at the centre of every campaign report, yet plenty of business owners still treat it as a vanity figure. This guide explains what ROAS means, how to calculate it in SGD, and how to read it against your margins so you know when a “5x” is genuinely good.
Quick answer: ROAS (return on ad spend) is the revenue you earn for every dollar you spend on advertising. The formula is ROAS = revenue from ads ÷ ad spend. If you spend S$2,000 and generate S$10,000 in sales, your ROAS is 5, often written as 5:1 or 500%. A “good” ROAS depends on your profit margin, so there is no single benchmark that fits every business.
The ROAS formula
ROAS is a simple ratio:
ROAS = Revenue attributed to ads ÷ Cost of those ads
You can express the result as a number (5), a ratio (5:1), or a percentage (500%). All three say the same thing: every S$1 of ad spend returned S$5 in revenue.
Two points matter before you trust the figure:
- Use attributed revenue, not total revenue. Only count sales the ad actually drove, based on your platform tracking or analytics, not your whole month’s turnover.
- Decide what goes into “ad cost.” At minimum it is media spend. Many Singapore SMEs also fold in agency management fees and creative costs to get a truer picture.
A worked example in SGD
Say a Singapore skincare brand runs a Google Ads campaign for a month.
|
Item |
Amount |
|
Ad spend (media) |
S$4,000 |
|
Revenue from the campaign |
S$20,000 |
|
ROAS |
20,000 ÷ 4,000 = 5.0 (5:1) |
At first glance a 5x return looks strong. But ROAS on its own does not tell you if the campaign made money. That depends on margin, which is where break-even ROAS comes in.
ROAS vs ROI: not the same thing
People use these interchangeably, and that causes bad decisions.
- ROAS looks only at ad revenue against ad cost. It measures campaign efficiency at the top line.
- ROI (return on investment) measures actual profit against your total investment, so it accounts for cost of goods, staff, tools, and overheads.
You can have a healthy ROAS and still lose money if your product margins are thin. ROAS tells you how well the ads pull in revenue. ROI tells you whether the business kept any of it.
|
ROAS |
ROI |
|
|
Measures |
Revenue per ad dollar |
Profit per dollar invested |
|
Includes product/overhead costs? |
No |
Yes |
|
Best for |
Judging campaign efficiency |
Judging overall profitability |
|
Typical use |
Daily campaign optimisation |
Financial planning |
What is a “good” ROAS?
There is no universal number. A common rule of thumb is 4:1, but that benchmark ignores your margins entirely.
The honest answer: a good ROAS is any figure comfortably above your break-even ROAS. A business selling high-margin digital products can thrive at 2.5x, while a low-margin retailer might still be losing money at 4x.
Here is a rough guide, keeping in mind it shifts with your economics:
|
ROAS |
What it usually signals |
|
Below break-even |
Losing money on ads |
|
At break-even |
Covering costs, no profit |
|
3x to 4x |
Healthy for many SMEs |
|
5x and above |
Efficient, though may signal room to scale spend |
A very high ROAS is not always the goal. If you are sitting at 10x, you may be under-investing and leaving growth on the table by not reaching new audiences.
Break-even ROAS: the number that actually matters
Break-even ROAS is the minimum return you need just to avoid losing money. Anything above it is profit; anything below is a loss.
Break-even ROAS = 1 ÷ Profit margin
If your gross profit margin is 40% (0.40), your break-even ROAS is 1 ÷ 0.40 = 2.5. You need at least S$2.50 in revenue per ad dollar before the campaign turns a profit.
Worked example: a product sells for S$100 with S$50 gross profit (50% margin). Break-even ROAS is 1 ÷ 0.50 = 2.0. So a 5:1 ROAS on that product is genuinely profitable, while a 1.8:1 would quietly bleed cash. Knowing this one number changes how you read every report. If you want the mechanics behind the auctions driving these costs, our guide on what is PPC covers the fundamentals.
How to improve your ROAS
Improving ROAS means lifting revenue, cutting wasted spend, or both.
- Tighten targeting. Cut audiences, keywords, and placements that spend without converting. Negative keywords alone often recover a big share of wasted budget.
- Fix the landing page, not just the ad. Traffic is only half the job. A faster, clearer page with a strong offer lifts conversions on the same spend. This is the heart of conversion rate optimisation.
- Improve creative and offer. Better hooks, clearer value, and relevant promotions raise click-through and conversion together.
- Raise average order value. Bundles, upsells, and free-shipping thresholds increase revenue per order without extra ad cost.
- Refine bidding and structure. Align bid strategies to profit goals, and separate high and low performers so budget flows to what works.
Singapore SMEs can also stretch their marketing budget through the Productivity Solutions Grant (PSG), which can offset up to 50% of the cost of eligible digital marketing solutions for qualifying businesses. Check current eligibility on the official channels before you plan around it.
Frequently asked questions
What is ROAS?
ROAS stands for return on ad spend. It is the revenue generated for every dollar spent on advertising, calculated as ad revenue divided by ad cost. A ROAS of 4 means S$4 back for every S$1 spent.
How do I calculate ROAS?
Divide the revenue attributed to a campaign by the amount you spent on it. S$15,000 revenue from S$3,000 spend gives a ROAS of 5, or 5:1.
What is a good ROAS?
It depends on your profit margin. A good ROAS is any figure above your break-even ROAS (1 ÷ profit margin). Many SMEs aim for 3x to 4x, but a thin-margin business may need more.
What is the difference between ROAS and ROI?
ROAS measures revenue against ad spend only. ROI measures actual profit against your total costs, including products and overheads. You can have a strong ROAS but weak ROI.
What is the difference between ROAS and ACOS?
ACOS (advertising cost of sales, used heavily on Amazon) is ad spend divided by revenue, the inverse of ROAS. A 5:1 ROAS equals a 20% ACOS. Lower ACOS is better; higher ROAS is better.
Get more from every ad dollar
Understanding ROAS is the first step. Turning a mediocre 2x into a profitable 5x takes structured testing, sharp targeting, and pages that convert. That is what our team does every day.
Explore our Google Ads agency and PPC services for campaign management built around profit, not just clicks. If you want ROAS tracked against real business outcomes, see our performance marketing approach. Ready to talk specifics? Contact us for a review of your current campaigns.
