Online Stores
Ecommerce Metrics That Matter: What to Track in Your Online Store
The key numbers every online store owner should track, including conversion rate, average order value, acquisition cost, lifetime value and return rate.
Online stores generate mountains of data, and most of it is noise. A handful of numbers tell you whether the business is healthy, where it is leaking money and what to fix next. This guide explains the ones that matter and how to use them.
1. Conversion rate
What it is: the percentage of visitors who place an order.
Formula: orders divided by sessions, times 100.
Why it matters: it shows how well your store turns visitors into buyers. Small improvements here are worth more than doubling traffic.
How to use it: compare by traffic source and device. If mobile converts far worse than desktop, your mobile experience needs work. Rates vary widely by industry and price point, so judge yourself against your own history rather than a headline average.
2. Average order value (AOV)
What it is: total revenue divided by number of orders.
Why it matters: raising AOV means each customer you win is worth more, which lets you afford more marketing.
How to raise it: bundles, free-shipping thresholds just above your average, related-product suggestions and quantity discounts. See ecommerce pricing, margins and VAT.
3. Customer acquisition cost (CAC)
What it is: total sales and marketing spend divided by the number of new customers won.
Why it matters: if it costs more to win a customer than they are worth, growth makes you poorer.
Watch out: include everything, such as ad spend, agency fees, discounts and tools, and measure it per channel, since some channels are far cheaper than others.
4. Customer lifetime value (CLV)
What it is: the total profit you expect from a customer over the time they buy from you.
A simple estimate: average order profit, times average orders per year, times average years as a customer.
Why it matters: compare CLV with CAC. A common rule of thumb is that CLV should be several times CAC, but what matters is that the ratio supports healthy cash flow. Repeat purchases raise CLV; see how to increase repeat customers.
5. Gross margin
What it is: the share of revenue left after the direct cost of goods, usually calculated per product and in total.
Why it matters: revenue is vanity; profit is sanity. Products with big sales but thin margins can hide losses.
Calculate it on prices excluding VAT, and account for shipping, payment fees and returns where you can.
6. Cart abandonment rate
What it is: the share of shoppers who add to cart but do not complete the purchase.
Why it matters: it shows friction at the most valuable step. See why shoppers abandon their carts.
How to use it: look at where the drop occurs: cart, shipping, payment. Fix the biggest gap first.
7. Return rate
What it is: the share of orders or items returned.
Why it matters: returns cost shipping, handling and sometimes the product itself. A high rate on a specific item usually points to a description, sizing or quality problem.
How to use it: break it down by product and reason. Fix pages and products with high return rates.
8. Repeat purchase rate
What it is: the percentage of customers who buy more than once.
Why it matters: it is the best indicator of satisfaction and the foundation of profitability. Track the time between purchases to plan reminders.
9. Traffic by source
What it is: where visitors come from: organic search, paid ads, social media, email, direct, referrals.
Why it matters: it shows which channels bring valuable customers, not just visitors. Always compare sources by sales and profit, not by clicks.
10. Return on ad spend (ROAS) and profit after ads
What it is: revenue generated per rand spent on ads.
Why it matters: ROAS ignores your margin. A ROAS of 3 sounds good but may lose money if your margin is 30%. Work out your break-even ROAS: 1 divided by your margin (on the ad-attributed revenue), and judge campaigns against it.
11. Site speed and technical health
Slow pages and errors silently reduce conversions. Monitor page speed, checkout errors and failed payments. See website speed and Core Web Vitals.
12. Stock-related metrics
- Stock turnover: how quickly inventory sells.
- Out-of-stock rate on best sellers.
- Days of stock remaining.
See inventory management for small online stores.
A simple dashboard
You do not need dozens of charts. Track these weekly:
| Metric | Why |
|---|---|
| Revenue and orders | Overall health |
| Conversion rate | Store effectiveness |
| AOV | Basket size |
| Traffic by source | Where growth comes from |
| Cart abandonment | Checkout friction |
| Gross margin | Real profitability |
| Return rate | Product and page quality |
Review customer acquisition cost, lifetime value and repeat rate monthly.
Setting it up
- Install analytics and set up key events for add-to-cart, checkout and purchase. See Google Analytics and Search Console for small business.
- Connect your store to accounting so margin and VAT are accurate. See connecting your accounting software to your store and CRM.
- Tag campaigns consistently so you can attribute sales to channels.
- Respect privacy and consent when tracking visitors. See POPIA and your business website.
How to use the numbers
- Pick one metric to improve each month.
- Make one change at a time, so you know what worked.
- Compare against your own past, not against someone else's headline figure.
- Look at trends, not single days.
- Pair numbers with conversations. Customer feedback explains the why behind the data.
Numbers will not run the business for you, but they stop you guessing. Start with conversion rate, average order value and margin, and add more as you grow.