How to measure the ROI of your Marketing
By Aaron Stiff, Founder — Bury St Edmunds Marketing. Published: November 2024 | Updated: April 2026
If you are spending money on marketing but cannot say whether it is working, you have a measurement problem, not a marketing problem.
Some small businesses in Suffolk and across East Anglia that we’ve seen invest in social media, SEO, or paid advertising without tracking what that investment actually returns. The result is either wasted budget or, worse, cutting spend on channels that were actually producing results.
This guide explains how to measure marketing ROI in practical terms, broken down by channel, so you can make informed decisions about where your money goes next.
What is Marketing ROI and why does it matter?
Marketing ROI is straightforward in principle: it measures the revenue generated by your marketing activity relative to what you spent on it. The basic formula is:
ROI = (Revenue from Marketing - Cost of Marketing) / Cost of Marketing x 100
If you spent £500 on a campaign and it generated £2,000 in revenue, your ROI is 300%. That tells you the campaign returned three pounds for every one pound invested.
Where most small businesses go wrong is not in understanding the formula, it is in failing to track the inputs. If you cannot attribute a sale to a specific channel or campaign, you cannot calculate ROI at all. That is why measurement infrastructure matters as much as the marketing itself.
How to measure Social Media ROI
Social media is where ROI measurement gets difficult, because not everything social media does is directly transactional. Follower counts and likes are visibility metrics, not revenue metrics. They tell you people are seeing your content, they do not tell you whether that content is generating business.
The metrics that actually matter for ROI are conversion rate from social traffic (how many visitors from social media take a desired action on your website), customer acquisition cost (how much you are spending per new customer gained through social), and revenue per channel (how much income is directly traceable to each platform).
Google Analytics tracks all of this if configured correctly. Under Acquisition, you can see exactly how many visitors came from Facebook, Instagram, LinkedIn, or any other platform, and what those visitors did once they arrived. If you are running a local business and your Instagram drives 200 visitors per month but zero enquiries, that is a signal; either the audience is wrong or the landing experience is broken.
For businesses in Bury St Edmunds and Suffolk, the most productive social platforms tend to be Facebook for community engagement and local reach, and Instagram for visual businesses such as hospitality, retail, and trades.
How to measure SEO ROI
SEO is a long-term investment, which makes ROI harder to measure in the short term but easier to demonstrate over time. The core metrics are organic traffic volume and growth trend, keyword rankings for your target search terms, conversion rate from organic visitors, and the monetary value of that traffic compared to what equivalent paid clicks would cost.
Google Search Console shows you exactly which search queries are bringing impressions and clicks to your site, and Google Analytics shows what those visitors do once they arrive. If you are ranking for "marketing agency Bury St Edmunds" and that query drives 50 visitors per month with a 5% enquiry rate, you can calculate the value of that ranking directly.
The comparison to paid search is useful here. If the same keyword costs £3 per click in Google Ads, 50 organic clicks per month represent £150 in equivalent ad spend you are not paying. Over a year, that single keyword saves £1,800 and that value builds up as you rank for more terms.
One critical point: SEO ROI is not immediate. For a new or low-authority site, expect three to six months before organic traffic becomes meaningful. Cutting SEO spend after four weeks because you have not seen results is the most common mistake small businesses make.
How to measure Paid Advertising ROI
Paid advertising i.e., Google Ads, Facebook Ads, Instagram Ads, is the easiest channel to measure because the platforms provide granular data by default. The key metrics are cost per click (CPC), which tells you what you are paying for each visitor; click-through rate (CTR), which tells you how compelling your ad is; conversion rate, which tells you how many of those clicks result in an enquiry or sale; and return on ad spend (ROAS), which is revenue divided by ad cost.
A healthy ROAS depends on your margins. A product business with 60% margins needs a lower ROAS to be profitable than a service business with 30% margins. There is no universal "good" ROAS, it is specific to your business model.
The mistake most small businesses make with paid ads is optimising for clicks rather than conversions. A campaign with a low CPC but zero conversions has a negative ROI regardless of how much traffic it drives. Always track through to the final action; the enquiry, the purchase, the booking, not just the click.
How to measure Email Marketing ROI
Email marketing consistently delivers the highest ROI of any digital channel for small businesses, yet most do not measure it properly. The metrics to track are open rate, click-through rate, conversion rate from email traffic, and revenue per email sent.
If you send a promotional email to 500 subscribers and 25 of them click through to your site, and 3 of those make a purchase worth £100 each, your email generated £300 in revenue. If the email platform costs £30 per month, the ROI calculation is clear.
The real power of email ROI measurement is in segmentation. When you track which types of emails (promotional, educational, seasonal) generate the most revenue, you can allocate your effort toward what actually works rather than sending the same content to everyone.
Setting up proper tracking for your business
None of the above works without proper tracking infrastructure. At minimum, every small business should have Google Analytics installed and configured with goals or conversion events that match your business objectives: an enquiry form submission, a phone call click, a booking confirmation.
You need Google Search Console connected to monitor organic search performance. You need UTM parameters on any links you share in email campaigns or social media posts, so Google Analytics can attribute traffic to the correct source. And if you are running paid ads, you need conversion tracking pixels installed on your website.
What good Marketing ROI looks like
There is no single benchmark that applies to every business, but there are useful reference points. A commonly cited target is a 5:1 ratio: £5 in revenue for every £1 spent. That represents a strong return for most small businesses. A 2:1 ratio is break-even territory once you account for cost of goods and overheads. Below 2:1, the channel is likely not sustainable.
However, these benchmarks assume you are measuring correctly. A channel showing 2:1 ROI might actually be contributing to brand awareness that makes other channels more effective; a customer who sees your social content, then searches your name on Google, then converts via organic search.
Attribution modelling is complex, and for most small businesses, a pragmatic approach is to track direct ROI per channel while accepting that some cross-channel contribution will go unmeasured.
Frequently Asked Questions
-
Monthly at minimum. Weekly if you are running active paid campaigns. The point of measurement is to inform decisions. Reviewing quarterly means you are three months late to act on underperforming channels or scale up what is working.
-
A 5:1 return — five pounds in revenue for every one pound spent — is a strong benchmark. Anything above 2:1 is generally sustainable. Below that, you need to either improve the campaign or reallocate the budget.
-
You can approximate it using platform-specific data from Facebook Insights, Google Ads, or your email marketing tool, but Google Analytics is the only way to see the full picture across all channels in one place. It is free and there is no good reason not to use it.
-
Engagement metrics like likes and comments measure visibility, not revenue. High engagement with low ROI usually means either your audience does not match your customer profile, or your social content is not directing people toward a conversion point such as your website, a booking page, or a contact form.
Need help setting up proper ROI tracking for your business? Get in touch with Bury St Edmunds Marketing to discuss a tailored measurement framework, or explore our services to see how we can support your marketing goals
Aaron Stiff is the founder of Bury St Edmunds Marketing, helps small businesses across Suffolk and East Anglia build marketing strategies that deliver measurable results. With hands-on experience in SEO, social media management, paid advertising, and content strategy, he works directly with business owners to turn marketing spend into trackable revenue.