Ecommerce Metrics: The KPIs That Actually Matter
Every ecommerce platform gives you numbers. Shopify shows total sales. Meta shows ROAS. Google Analytics shows sessions. QuickBooks shows expenses. The problem is not a lack of data. The problem is knowing which numbers actually matter for your business.
Most store owners track too many metrics and act on too few. This guide covers the ecommerce KPIs that tell you whether your business is healthy, where the problems are, and what to focus on next.
Revenue Metrics
Total Revenue
What it tells you: how much money came in the door. This is the starting point, not the finish line. Revenue alone does not tell you if you are profitable.
Track it: daily and monthly. Compare month over month and year over year. A growing revenue number with a shrinking profit number is a warning sign, not a success.
Average Order Value (AOV)
What it tells you: how much each customer spends per transaction. Calculate it by dividing total revenue by total orders.
Why it matters: raising AOV is often easier and cheaper than getting more customers. If your AOV is $45 and you can get it to $55 through bundling or free shipping thresholds, that is a 22 percent revenue increase with zero extra ad spend.
Revenue by Channel
What it tells you: where your money comes from. Break revenue down by source: organic search, paid ads (Meta, Google, TikTok), email (Klaviyo), direct, referral, and repeat purchases.
Why it matters: if 80 percent of your revenue comes from one channel, you are exposed. If Meta changes its algorithm or raises CPMs, your business takes an immediate hit.
Profitability Metrics
Gross Margin
What it tells you: what percentage of revenue you keep after subtracting the cost of the product itself (cost of goods sold). The formula is (Revenue - COGS) / Revenue.
Net Profit Margin
What it tells you: what percentage of revenue you keep after ALL costs, including COGS, shipping, ad spend, payment processing, software, payroll, and overhead.
Healthy range: 10 to 20 percent for established ecommerce businesses. Early-stage businesses often run at 0 to 5 percent while investing in growth. Negative margins that persist beyond the first year need investigation.
Operating Expenses as Percentage of Revenue
What it tells you: how much of your revenue goes to running the business (not including product costs). This includes ad spend, software, shipping, payment fees, and team costs.
Why it matters: if your operating expenses are 60 percent of revenue and your gross margin is 55 percent, you are losing money on every sale. Tracking this monthly shows whether your cost structure is sustainable as you grow.
Customer Metrics
Customer Acquisition Cost (CAC)
What it tells you: how much you spend to get one new customer. Calculate it by dividing total marketing spend by the number of new customers acquired.
Why it matters: if your CAC is higher than your first-order profit, you need repeat purchases to break even. Knowing your CAC relative to your customer lifetime value tells you whether your growth is sustainable.
Customer Lifetime Value (LTV)
What it tells you: how much total revenue you can expect from one customer over time. Calculate it from actual purchase history: average order value multiplied by average number of orders per customer.
Why it matters: a business where LTV is 3 times CAC has room to grow. A business where LTV barely exceeds CAC is one bad quarter away from trouble.
Repeat Purchase Rate
What it tells you: what percentage of customers buy more than once. Calculate it by dividing repeat customers by total customers.
Healthy range: 20 to 40 percent for most DTC brands. Subscription businesses aim for 60 percent or higher. If your repeat rate is below 15 percent, you are constantly paying to acquire new customers to replace the ones who never come back.
Ad Performance Metrics
Return on Ad Spend (ROAS)
Cost Per Acquisition (CPA)
What it tells you: how much you spend in ads to get one purchase. Different from CAC because CPA only counts ad spend, while CAC includes all marketing costs.
Why it matters: if your CPA is $30 and your average order profit (after product and shipping costs) is $25, every ad-driven sale loses $5.
Ad Spend as Percentage of Revenue
What it tells you: how much of your revenue goes to advertising. Calculate it by dividing total ad spend by total revenue.
Healthy range: 15 to 30 percent for growth-stage DTC brands. Below 10 percent usually means you are under-investing in growth. Above 35 percent usually means your ads are inefficient or your margins are too thin.
Cash Flow Metrics
Cash Runway
What it tells you: how many months your business can survive at the current burn rate before running out of cash. Calculate it by dividing your cash balance by your average monthly net cash outflow.
Why it matters: profitable businesses can still fail if they run out of cash. Inventory purchases, ad spend upfront, and delayed payouts from marketplaces create cash flow gaps that do not show up in your P&L.
Inventory Turnover
What it tells you: how quickly you sell through your inventory. Calculate it by dividing cost of goods sold by average inventory value.
Why it matters: slow-moving inventory ties up cash and incurs storage costs. Fast turnover means your cash is working efficiently. Most DTC brands aim for 4 to 8 turns per year.
Which Metrics to Check and How Often
| Frequency | What to Check |
|---|---|
| Daily | Revenue, orders, ad spend, ROAS |
| Weekly | AOV, CAC, CPA, cash balance |
| Monthly | Net margin, operating expenses, LTV, repeat rate, inventory |
| Quarterly | Revenue by channel trends, cash runway, year-over-year growth |
Stop Drowning in Dashboards
The challenge is not finding data. It is seeing the right data in one place without logging into five platforms and building spreadsheets. Nummbas pulls your ecommerce, ad, accounting, and operations data together so you can see all of these KPIs in a single dashboard, with alerts when something needs your attention.