If you’ve worked with a digital marketing agency before, you may have heard the term KPIs.
But what does it mean, and which ones are important for you to understand?
This guide covers the digital marketing metrics and KPIs that matter for businesses spending money on SEO, PPC, social media, email, and content marketing.
At Soapbox Digital Media, we always try to keep things as simple as possible and not overload you with information.
Here is everything you need to know about which numbers to watch, what those numbers mean, and when you need to pay more attention.
What Are Digital Marketing KPIs and Marketing Metrics? – By Professional Digital Marketers in Glasgow
Simply put, a key performance indicator (KPI) is a measurable value that shows how effectively a business is achieving its marketing objectives.
In the digital marketing landscape, these are specific metrics used to measure the effectiveness of your online marketing strategies, campaigns, and channels.
The word “key” is doing the heavy lifting here.
Every digital marketing campaign generates dozens of data points.
From impressions, clicks, bounce rate, session duration, pages per visit, and scroll depth.
All of these are metrics, but not all of them are KPIs.
A KPI is a metric that directly relates to a business goal. This might be generating leads, acquiring new customers, or increasing revenue.
Everything else is supporting data that might help you diagnose a problem, but shouldn’t be the number you report to the board.
The right marketing KPIs for your business depend on your digital marketing strategy, your marketing funnel, and what stage of growth you’re in.
A startup trying to build brand awareness will track different KPIs from an established business optimising its cost per acquisition.
But on top of this, there’s a core set of digital marketing metrics that almost every business should be tracking.
Conversion Rate
Conversion rate is the percentage of visitors who complete a desired action on your website or landing page.
That action might be filling in a contact form, making a purchase, signing up for a newsletter, or booking a consultation.
If 100 people visit your website and 3 of them submit an enquiry from, your conversion rate is 3%.
It is one of the most important metrics for most businesses because it tells you whether your website is turning visitors into leads or customers.
A website with high traffic and a low conversion rate means you’re paying to get people there, but they’re leaving without doing anything useful.
“Ideal” conversion rates can vary by industry and traffic source. But it is still important to see an increase in conversion rates for any marketing campaign.
Google Analytics tracks conversion rate across your whole site and by individual pages, traffic sources, and campaigns.
If you’re running any kind of digital marketing campaign and you’re not tracking conversions, you’re flying blind.
Cost Per Lead (CPL)
Cost per lead measures how much you spend on marketing to generate one qualified lead.
If you spend £1,000 on Google Ads in a month and it generates 25 enquiries, your cost per lead is £40.
This metric helps you compare the efficiency of different marketing channels and campaigns on a like-for-like basis.
CPL is one of the most important KPIs for service businesses, B2B companies, and anyone whose marketing goal is lead generation rather than direct online sales.
It tells you whether your advertising campaign spend is producing results at a sustainable rate.
A cost per lead of £40 might be excellent if you’re selling a service worth thousands and converting one in five leads. But you need to rethink your strategy if you’re selling a £50 product.
The metric helps you make budget allocation decisions.
If your PPC marketing campaigns deliver leads at £30 each and your social media campaigns deliver them at £90 each, you know where to put your next pound.
That doesn’t mean you should abandon the more expensive channel entirely (it may be reaching a different audience or building brand awareness), but it gives you the data to make an informed choice rather than guessing.
Cost Per Click (CPC)
Cost per click is the amount you pay each time someone clicks on one of your digital ads.
It’s the standard pricing model for Google Ads and most paid social media advertising. If you bid £2.50 per click on a keyword and your ad gets 200 clicks, you’ve spent £500.
CPC on its own doesn’t tell you much.
A £5 cost per click is fine if those clicks convert into £500 customers.
It’s a waste if those clicks bounce off your landing page without taking action. CPC becomes useful when you pair it with conversion rate and cost per lead to understand the full cost of acquiring a customer through paid channels.
Average CPC varies enormously by industry and keyword. For competitive and high profit industries, the CPC can be a lot higher than lower industries.
Tracking your CPC over time shows whether your campaigns are becoming more or less efficient, and whether competition for your target keywords is increasing.
Cost Per Acquisition (CPA)
Cost per acquisition (sometimes called cost per customer) measures the total marketing and sales expenses required to acquire a new customer.
It’s different from cost per lead because it accounts for the full journey.
If you spend £3,000 on marketing in a month and gain 15 new customers, your CPA is £200.
This is the metric that directly connects your marketing spend to revenue, and it’s the number that tells you whether your digital marketing efforts are profitable.
CPA includes all marketing costs: ad spend, agency fees, software subscriptions, content creation, and any other marketing activity that contributed to acquiring those customers.
The number of new customers divided by total marketing spend gives you the figure.
If your CPA is lower than the profit margin on your product or service, your marketing is working. If it’s higher, you’re losing money on every new customer you acquire.
Click-Through Rate (CTR)
Click-through rate is the percentage of people who see your ad, email, or search result and click on it.
If your Google Ad is shown 10,000 times and receives 300 clicks, your CTR is 3%.
You calculate it by dividing the number of clicks by the number of impressions and multiplying by 100.
CTR measures how effective your marketing messages are at generating interest.
A high CTR means your headline, ad copy, or email subject line is resonating with your audience. Whereas low CTR means people are seeing your message but not finding it compelling enough to act on.
Average CTR benchmarks vary by channel.
This means you get different rates for Google Search Ads to email marketing, and organic search.
Even within organic search, the page position matters.
The top position of Google can secure 20%-40%. The bottom of page one only sees around 2%.
This demonstrates how important SEO is for driving traffic. If you aren’t ranking highly on page 1, you are almost invisible to your target audience.
Return on Investment (ROI): The Key Performance Indicator for Marketing Strategies
Return on investment is the ultimate performance marketing metric.
It tells you how much profit your marketing generates for every pound you spend.
The formula is straightforward.
(Revenue generated minus marketing cost) divided by marketing cost, expressed as a percentage.
If you spend £2,000 on a digital marketing campaign and it generates £10,000 in revenue, your ROI is 400%.
For every pound you spent, you made four back! If a campaign costs £2,000 and generates £1,500 in revenue, your ROI is negative and you lost money.
ROI is the metric that answers the question every business owner actually cares about.
Is this marketing making me money or costing me money?
The Challenge with ROI
As all business owners know, the customer journey is fairly linear.
They may find you through an ad, visit your site three times in two weeks through organic search, then call the number mentioned on your social media.
In this case, which channel gets the credit?
Tracking this accurately requires proper analytics setup and conversion tracking, which is one of the reasons working with a digital marketing agency that understands measurement pays for itself.
Customer Lifetime Value (CLV)
Customer lifetime value measures the total revenue a business can expect from a single customer account over the entire duration of the relationship.
If an average customer spends £500 per year and stays with you for four years, the CLV is £2,000.
CLV matters because it changes how you think about acquisition costs.
A cost per acquisition of £200 looks expensive if you’re thinking about a single transaction of £300.
But if the customer is worth £2,000 over their lifetime, it starts to make sense.
Marketing and sales teams that understand CLV tend to invest more confidently in acquiring the right customers rather than chasing the cheapest leads.
This key metric also helps you identify which marketing channels bring in the most valuable customers.
Your cheapest leads might come from one channel but churn after three months, while a more expensive channel brings customers who stay for years.
Tracking these metrics will give you a much clearer picture of where your marketing budget should go.
Marketing Qualified Leads (MQLs)
A marketing qualified lead is a lead that your marketing team has identified as more likely to become a customer based on their behaviour and engagement.
Someone who visits your pricing page three times, downloads a guide, and opens every email you send is more qualified than someone who bounced from the homepage after five seconds.
Tracking MQLs helps you measure the quality of the leads your marketing produces, not just the quantity.
A hundred marketing qualified leads that are genuinely interested in your product or service are worth more than a thousand unqualified names on a spreadsheet.
Website Traffic and Traffic Sources
Total website traffic is a useful baseline metric but it’s not a KPI on its own.
What matters more is where the traffic comes from and what it does when it arrives.
Google Analytics breaks your traffic into channels: organic search (from SEO), paid search (from PPC), social media, email, direct (people typing your URL), and referral (links from other websites).
Tracking these metrics by channel tells you which of your marketing initiatives are driving the most visitors, and pairing traffic data with conversion data tells you which visitors are most valuable.
Performance Marketing Metrics: Bounce Rate and Engagement
Bounce rate measures the percentage of visitors who land on a page and leave without interacting further.
A high bounce rate on a landing page might indicate that the page doesn’t match what the visitor expected, that it loads too slowly, or that the call to action isn’t clear enough.
Engagement metrics like time on page, pages per session, and scroll depth provide context.
A bounce rate of 80% on a blog post might be fine if visitors are reading the whole article and then leaving satisfied. A bounce rate of 80% on a service page with a contact form suggests something is wrong, because those visitors should be taking action.
These are diagnostic metrics rather than primary KPIs.
They help you understand why a campaign is or isn’t converting. This is valuable when you’re trying to optimise your digital marketing strategy rather than just report on it.
So Which KPIs to Track for Your Digital Marketing Objectives?
The honest answer is: fewer than you think.
For most businesses, the essential metrics come down to five or six numbers that connect marketing activity to business results.
PPC Campaigns
Track cost per click, cost per lead, conversion rate, and ROI.
SEO Strategies
Track organic traffic, keyword rankings, conversion rate from organic traffic, and the number of leads or sales generated.
Email Marketing
Track open rate, click-through rate, and revenue per email
Social Media Marketing
Track engagement rate, referral traffic to your website, and any conversions that come from social channels.
Get Your Digital Marketing Strategy Metrics Working for You
If you’re spending money on digital marketing but can’t confidently say what it’s returning, the problem isn’t the marketing. It’s the measurement.
We help businesses across Glasgow and the UK set up proper tracking, identify the KPIs for digital marketing that matter for their business, and build marketing plans that deliver measurable results.
If you are looking to grow you business, give our digital marketing team a call on 0141 429 1356 or get in touch through our website.
