You can't measure an e-commerce store's success by revenue alone. Sales can grow even when marketing costs are rising faster or profits are shrinking.

That's why it's important to track metrics that show whether your e-commerce store is truly performing efficiently.

Conversion rate

The conversion rate shows what proportion of visitors make a purchase.

For example, if 1,000 people visit your store and 20 of them buy, the conversion rate is 2%.

For most e-commerce stores, this typically falls between 1-3%.

If the conversion rate is low, the reasons might include:

  • a slow website
  • a complicated or lengthy checkout
  • confusing navigation
  • lack of trust signals (reviews, payment logos, guarantees)

Often, simplifying the checkout process is one of the quickest ways to boost conversion.

Average order value

Average Order Value shows how much a customer spends on average per purchase.

For example, if the total value of 10 orders is 500 EUR, then the average order value is 50 EUR.

There are several ways to increase it:

  • through cross-selling (related products)
  • with bundle offers
  • by adding a free shipping threshold
  • with discounts starting from a certain order amount

It's often easier to increase AOV than to drive more traffic.

Cart abandonment rate

The cart abandonment rate shows how many users add a product to their cart but don't complete the purchase.

In e-commerce, this is often 60-80%.

The most common reasons:

  • unexpected shipping costs at checkout
  • an overly long purchase process
  • mandatory account creation
  • limited payment methods

Checkout optimization is one of the highest-impact improvements an e-commerce store can make.

Customer Lifetime Value

Customer Lifetime Value shows how much a single customer spends over the entire customer relationship.

If a customer buys an average of 3 times and each purchase is 50 EUR, then CLV is 150 EUR.

This metric is especially important for e-commerce stores that rely on repeat purchases.

CLV can be increased through:

  • email marketing
  • loyalty programs
  • subscription-based products

Customer Acquisition Cost

Customer Acquisition Cost shows how much it costs to acquire a single customer.

If 2,000 EUR is spent on marketing and it brings in 100 customers, the CAC is 20 EUR.

The key rule is simple:

CLV must be greater than CAC.

If acquiring a customer costs more than the customer ultimately spends, the business model is not sustainable in the long run.

E-commerce success doesn't depend solely on traffic or revenue. It's important to understand how visitors behave and how efficiently the store converts them into buyers.

By tracking these KPIs regularly, it becomes easier to see where the real growth opportunities lie.