Quick answer: The five metrics that actually tell you how your store is performing are conversion rate, average order value, customer lifetime value, customer acquisition cost, and returning customer rate. Bounce rate, pageviews and social media follower count are the three that look important but consistently mislead.
There is no shortage of data in ecommerce. Every platform, analytics tool and dashboard will show you dozens of numbers at any given time. The problem is that not all of them are useful, and some actively lead you in the wrong direction.
This guide covers the five metrics that genuinely tell you how your store is performing, how to calculate each one, what good looks like, and what to do when yours is off. It also covers three metrics that look important but are frequently misread.
The 5 Metrics That Matter
1. Conversion Rate (CVR)
Your conversion rate is the percentage of visitors to your store who complete a purchase. It is the most direct measure of how well your site turns traffic into revenue.
How to calculate it: Divide the number of orders by the number of sessions, then multiply by 100. If you had 5,000 sessions and 75 orders, your CVR is 1.5%.
What good looks like: The average ecommerce conversion rate is typically between 1% and 3%. Fashion and apparel tends to sit at the lower end. Niche products with highly targeted traffic often perform above 3%. Anything below 1% warrants investigation.
What to do if yours is low: Low CVR is usually a product page, checkout or trust problem rather than a traffic problem. Run a session recording tool like Hotjar or Microsoft Clarity to see where users are dropping off. Check your checkout abandonment rate specifically, since that will tell you whether the problem is happening before or after someone decides to buy.
Break your CVR down by device. Mobile conversion rates are nearly always lower than desktop, but a large gap (say, 0.8% mobile versus 2.5% desktop) points to a specific mobile experience issue worth fixing.
2. Average Order Value (AOV)
AOV tells you how much customers spend, on average, per transaction. Increasing it means more revenue from the same number of orders and the same acquisition spend.
How to calculate it: Divide total revenue by the number of orders over a given period. If you made £30,000 from 400 orders, your AOV is £75.
What good looks like: This varies enormously by product type. A store selling consumables might have an AOV of £20. A homewares store might be £120. The useful benchmark is your own historic AOV and how it trends over time.
What to do if you want to improve it: Three tactics consistently move AOV upward:
- Free shipping thresholds. Setting free delivery at a point slightly above your current AOV (say, £10 above) encourages customers to add more to reach it. Test the threshold level to find the right balance.
- Bundling and cross-selling. Showing complementary products on the product page or in the basket can increase order size without feeling pushy. "Frequently bought together" carousels work well when the suggestions are genuinely relevant.
- Volume discounts. "Buy 2, get 10% off" or "Buy 3 for £X" can lift AOV significantly, particularly for consumable or giftable products.
3. Customer Lifetime Value (CLV)
CLV is the total revenue you can expect from a single customer across their entire relationship with your store. It is arguably the most important strategic metric in ecommerce because it tells you how much you can afford to spend to acquire a customer.
How to calculate it: A simple version is AOV multiplied by purchase frequency per year, multiplied by average customer lifespan in years. If your AOV is £60, customers buy 3 times a year, and they stay for 2 years on average, your CLV is £360.
What good looks like: Again, this is relative to your category. The key ratio to maintain is that CLV should be meaningfully higher than your Customer Acquisition Cost (CAC). A CLV:CAC ratio of at least 3:1 is a commonly used target.
What to do if yours is low: A low CLV usually means customers are not coming back. This is a retention problem: post-purchase communication, loyalty programmes and product satisfaction all play a role. Segmenting your CLV by acquisition channel is also revealing. Customers acquired through different channels often have very different lifetime values.
4. Customer Acquisition Cost (CAC)
CAC is the total cost of bringing in one new customer. It includes all marketing and advertising spend, not just the last click.
How to calculate it: Divide total marketing and sales spend over a period by the number of new customers acquired in that same period. If you spent £8,000 on marketing in a month and acquired 200 new customers, your CAC is £40.
What good looks like: Your CAC should be significantly lower than your CLV. Most sustainable ecommerce businesses target a CAC that is no more than a third of CLV.
What to watch for: CAC tends to creep up over time as you exhaust your most accessible audiences. If yours is rising, look at whether you are over-reliant on paid acquisition. Building organic channels, including search traffic, email and social, reduces your average CAC considerably over time.
Also separate new customer CAC from blended CAC (which includes reactivated customers). The blended number will always look better and can mask a rising acquisition problem.
5. Returning Customer Rate
This is the percentage of your orders in a given period that come from customers who have purchased before. It is one of the clearest indicators of brand health.
How to calculate it: Divide the number of orders from returning customers by total orders, then multiply by 100.
What good looks like: For most ecommerce stores, a returning customer rate of 25% to 30% is healthy. Stores with strong community, subscription models or consumable products often see rates well above this.
What to do if yours is low: If fewer than one in five customers ever comes back, the product, the post-purchase experience or the communication is letting people down. Start by looking at your post-purchase email sequence. Do you have one? Does it add value or just ask for another sale? A good welcome and follow-up sequence is one of the highest-return investments in ecommerce.
3 Metrics That Often Mislead
1. Bounce Rate
Bounce rate (the percentage of sessions where a user visits one page and leaves) sounds like a problem. But context changes everything.
A blog post that answers a question well will often have a high bounce rate because the visitor found what they needed and left satisfied. A product page with a high bounce rate is more concerning. A landing page for a paid ad campaign might have a 70% bounce rate and still be performing well if the 30% who stay convert at a high rate.
Before acting on bounce rate, understand which pages you are looking at and what behaviour you expect from visitors there.
2. Pageviews
More pageviews can mean more engaged customers browsing your catalogue. It can also mean customers cannot find what they want and are clicking around in frustration.
Pageviews as a headline metric tells you almost nothing useful on its own. The more meaningful question is whether pageviews are translating into revenue. Track revenue per session or revenue per visitor instead.
3. Social Media Followers
Follower count is tempting to track because it goes up in a satisfying way. But a large following with low engagement and low click-through rates does not pay for stock.
The metrics that matter on social are reach, click-through rate and revenue attributed to social traffic. Follower count is a distant proxy for these at best. Prioritise building your email list and organic search presence over chasing followers. Both give you more direct and measurable returns.
Build a Simple Dashboard
Rather than checking dozens of metrics across multiple platforms, it is worth building a simple weekly view of the five that matter. Even a basic spreadsheet with CVR, AOV, CLV, CAC and returning customer rate tracked week by week will give you a clearer picture of your store's health than any amount of social analytics. Knowing your numbers is the first step to improving them.
