What Digital Marketing ROI Can a Small Business Expect?

A small business can expect digital marketing ROI to arrive in stages: paid search shows whether it pays within weeks, SEO builds through the first year and compounds after it, and GEO currently returns visibility before it returns measurable revenue. No honest agency can give you a single ROI percentage in advance, because your return depends on three numbers only you hold: your gross profit per sale, your close rate and your total marketing cost.

Getting the expectation wrong is expensive. Owners who judge SEO on a PPC timeline often cancel in the months when the groundwork is done but the rankings have not yet arrived. Owners who judge PPC on revenue instead of gross profit can keep funding campaigns that lose money every month. 

This guide draws on the results published in Dandy Marketing’s 12 live case studies, covering SEO and PPC campaigns for UK small businesses from 2020 to 2026, plus the most recent data available from independent studies on each channel.

How do you calculate digital marketing ROI?

Digital marketing ROI is the gross profit your business generates from marketing, minus what the marketing cost, divided by that cost and multiplied by 100. Written as a formula: ROI = (gross profit from marketing minus marketing cost) divided by marketing cost, times 100. A result of 100% means every £1 spent came back as £2 of gross profit.

Two choices in that formula decide whether your ROI calculation is useful. The first is gross profit rather than revenue: a £2,500 job with a 35% margin earns £875, not £2,500, and measuring revenue flatters every campaign. The second is the full marketing cost: ad spend across every advertising platform, agency or freelancer fees, software, content creation and the hours you or your team spend on marketing activities.

A worked example: break-even for a local trades business

A local trades business spending £1,200 a month on Google Ads breaks even at 6 enquiries a month in the hypothetical example below, which shows the method rather than a client result. The roofing firm spends £1,200 a month on paid advertising: £800 of Google Ads spend and £400 of management. Its average job is worth £2,500 at a 35% gross margin, so each job earns £875 of gross profit. The firm wins 1 in 4 of the enquiries it quotes.

The gap between 119% and 525% is the reason to measure marketing ROI on gross profit. A low margin business can show a healthy revenue return while losing money on every campaign. The same arithmetic turns into one rule you can apply to any channel:

Break-even leads per month = monthly marketing cost divided by gross profit per sale, divided by your close rate. Every lead a digital marketing campaign brings in above that number is return on investment.

What ROI can SEO, PPC and GEO each deliver?

SEO, PPC and GEO return money on different clocks: PPC pays or fails within weeks, SEO compounds over years, and generative engine optimisation (GEO) currently shows up as visibility in AI answers and higher quality visits before it shows up as revenue. The table compares the three channels on the evidence available in October 2026.

PPC ROI: the fastest feedback loop

PPC ROI is the quickest channel return a small business can measure, because every click has a price, the clicks come from people already searching, and Google Ads reports conversions against that spend from the first day. WordStream’s 2025 benchmark of 16,446 US search campaigns puts the median conversion rate at 7.52% and the median cost per lead at $70.11 (WordStream, updated May 2026). UK costs and sectors differ: The SEO Works quotes UK commercial clicks at £2.16 to £8.84 each (The SEO Works), so treat the US figures as a sense check rather than a target.

Three Dandy accounts show what PPC ROI looks like for UK small and medium-sized businesses. 

• MGOC Spares, a classic car parts retailer, ran Shopping and Performance Max campaigns on a custom product feed segmented by bestsellers and high margin items, and recorded a cost per acquisition of £9.40 and a 2024 return on ad spend (ROAS, the revenue earned per £1 of ad spend) of £9.50. 
• Podiatry Hub has run on Google Ads since September 2021, averaging 156 calls, direction requests and bookings a month at £0.87 per local action, with more than 6,000 phone calls and bookings in total. 
• Chiropractor Bramhall reached an ongoing 21% conversion rate, and the owner increased media spend by 50% within 2 months.

PPC’s weakness is that the return stops when the spend stops, and next month’s leads cost the same as this month’s. PPC ROI improves through work on the account rather than on its own: negative keywords, ad copy tests, landing page tests and bid strategies built on the account’s own conversion data. The Chiropractor Bramhall account received more than 1,000 changes in 6 months. 

See how Dandy runs PPC management for small businesses.

SEO ROI: a slow start and a compounding return

SEO ROI starts slower than PPC but compounds, because the monthly cost of search engine optimisation stays roughly flat while the organic traffic and leads it produces keep building. Organic clicks cost nothing at the point of the click, so each extra lead lowers the cost per lead for the whole programme. That is how a small business with a limited budget can win search results against larger competitors over time, and why rankings keep sending visitors for a period after the work stops, which reduces dependence on paid advertising.

• Future Lift Services shows both halves of that return. Organic sessions rose from 348 in 2022 to 30,955 in 2025, and the share of organic sessions that became leads rose from 0.17% to 2.42%, so the site gained more visitors and converted them better. 
• Strength Ambassadors, a London gym, grew from 2,000 sessions a month in June 2020 to more than 15,000 and logged 208 new leads in the first 9 months. 
• MGOC Spares came through a full site migration with organic clicks up from 115,731 to 203,540 and revenue up 61% year on year.

SEO ROI does not always come from more traffic. 

• Cornish Lime, an established ecommerce site selling lime and heritage building products, already had steady traffic, so the work focused on conversion rate optimisation: product pages, calls to action and social proof. Over 18 months its organic conversion rate rose 67% and revenue rose 28%. 

The trade-off with SEO is cash flow: the first months are mostly cost while technical fixes, website content, content marketing and links are put in place. A business that needs new revenue this quarter should not rely on SEO alone.

GEO ROI: real, early and hard to isolate

GEO ROI is the return from being cited or recommended in AI answers such as Google’s AI Overview, ChatGPT and Perplexity, and in 2026 it is real but hard to measure on its own. The pressure on traditional search is clear: in Pew Research Center’s analysis of 68,879 Google searches by 900 US adults in March 2025, people clicked a traditional result on 8% of visits when an AI summary appeared, against 15% when it did not (Pew Research Center, July 2025).

The visits that do arrive from AI search can be valuable. Ahrefs reported that AI search sent 0.5% of its website visits but 12.1% of its sign ups, a conversion rate 23 times higher than traditional organic search (Ahrefs, June 2025). That figure comes from one software company’s own site. Other data is less dramatic: Foundation cites Amsive research finding conversion rates of 4.87% for AI visitors and 4.60% for organic visitors, a gap too small to count as a real difference in that study (Foundation).

For a small business, most GEO work overlaps with good SEO: pages that answer customer questions directly, consistent business details across the web, reviews, and mentions on trusted third party sites. 

Measure GEO by asking AI tools the questions your customers ask and recording whether your business appears, by watching branded search in Google Search Console, and by adding AI tools to your “how did you hear about us?” options. Dandy’s GEO service reports on these measures. 

Email marketing and paid social: different jobs, different returns

Email marketing and paid social are the two digital channels most small businesses add after search, and they earn their return in different ways: email sells to people who already know you, while paid social reaches potential customers who are not yet searching. The Data and Marketing Association’s 2019 Marketer Email Tracker reported email marketing returning just over £42 for every £1 spent (DMA, 2019). That figure is dated and self-reported by marketers, but the logic holds: email campaigns cost little because you own the list.

Paid social is digital advertising on platforms such as Facebook, Instagram and LinkedIn, and its ROI depends on how well the targeting and creative match your target audience. Customer behaviour on each social media platform differs from search: people are scrolling, not looking for a supplier, so paid social tends to produce fewer high intent leads than Google Ads. 

Many small businesses get the best return from paid social as retargeting, showing ads to people who visited the website; Dandy runs a retargeting campaign for Podiatry Hub and tested retargeting audiences for Lucky Voice Karaoke for Business. Measure email marketing campaigns and social media marketing the same way as PPC: cost per lead or sale against your break-even number.

How long does digital marketing take to pay back?

Digital marketing pays back on two timelines for most small businesses: paid search shows within weeks whether it can cover its cost, and SEO returns build through the first year before they compound. The table sets out the pattern seen across Dandy’s SEO and PPC accounts; actual timings depend on competition, budget and how much groundwork the website needs.

New websites start further back but can still grow quickly in year one. Lucky Voice Karaoke for Business began in January 2025 with no search visibility and no Google Ads history, and its first year produced a 477% year on year traffic increase and 278% more leads. C Kearney Roofing launched a brand-new website with no authority or backlinks and recorded a 178% year on year traffic increase and 288% more leads.

Why big ROI percentages can mislead small business owners

Large percentage increases in marketing case studies usually reflect a small starting point, so they show the direction of travel rather than the money returned.

The Freehold Collective reports a 5,200% increase in leads, but the work started from a three page website; the more useful figure is the 110 leads a month it now averages, about 50 of them from a freehold purchase calculator built as a lead generation tool. Huddle reports a 1,000% increase in leads from a site that had little content when the work began.

That includes our own case studies. Most of Dandy’s 12 published case studies report traffic, rankings and lead growth rather than profit or revenue growth, because clients rarely publish their margins. Before you trust any agency’s ROI claim, ask for four things: the starting baseline, the total cost, the value of a lead or sale, and the timeframe. Traffic, impressions and click through rates without those four are vanity metrics. 

Our SEO effectiveness statistics round-up applies the same test to industry figures.

What should a small business track to prove marketing ROI?

A small business needs four numbers to measure marketing ROI: total marketing spend, leads or sales by source, close rate and gross profit per sale. Most businesses already have the last two; the tracking below supplies the first two. Tracking quality matters as much as targeting or channel choice, because customer journeys cross several channels and devices, and AI answers that never send a click leave gaps that no attribution model fills on its own.

1. Set up key events in Google Analytics 4 for form submissions, phone calls and purchases, so campaign success is judged on the desired action rather than visits.
2. Track clicks on phone numbers and email addresses. Dandy added click tracking for C Kearney Roofing so phone and email enquiries are counted alongside forms.
3. Record the lead source in your CRM. The Freehold Collective’s calculator leads flow straight into Asana and the CRM, so each lead keeps its source.
4. Import won sales or jobs back into Google Ads, so campaigns bid toward revenue rather than cheap clicks.
5. Ask every new customer how they found you, and include AI tools such as ChatGPT in the options. That first-party answer covers the zero-click visits analytics cannot see.
6. Compare each month’s leads against your break-even number, and review marketing performance by channel rather than as one total.
7. Test incrementality before you scale: pause one campaign or one location for a few weeks and check whether total enquiries fall, which shows how many leads the channel creates rather than claims.

How much should a small business spend to see a return?

A small business should spend enough for a channel to reach its break-even number of leads, and should not raise the marketing budget until it does. With the worked example above, £1,200 a month needs 2 jobs at £875 of gross profit to pay for itself. A business earning £50 of gross profit per sale needs 24 sales a month to cover the same £1,200, which points toward a more cost effective channel mix or a higher value offer.

For reference, Dandy’s prices start at £200 a month for PPC management plus ad spend, £399 a month for full SEO management and £75 a month for the Dot self-service SEO tool, and packages are grouped by monthly advertising spend: under £1,000, £1,000 to £5,000, and £5,000 or more. 

Dandy’s managed plans run on rolling contracts with no lock-in, so a channel that misses its break-even number can be paused rather than paid for until a contract ends.

Your next step: find your break-even number

Work out one number this week: your break-even leads per month. Take your monthly marketing cost, divide it by gross profit per sale, then divide by your close rate. If your current campaigns already beat that number, scale the channel that beats it by the widest margin. If they do not, fix tracking first, because you cannot improve a return you cannot see. For a second opinion on your tracking, margins and channel mix, talk to the Dandy team.

Quick answers on marketing ROI

The short answers below cover four marketing ROI questions taken from Google’s People Also Ask results for this topic, each answered in two or three sentences.