A modern ecommerce dashboard can show you a hundred KPIs. Most of them are not worth watching every week. The question is not "what can I measure" but "what do I need to watch to make the next decision correctly." For most ecommerce businesses, the answer is six numbers, give or take.
Here are the six that matter most, in plain language.
1. Contribution margin per order
The amount left from each order after you have paid for the goods, the shipping, the platform fees, the returns, and the ads that got you the customer. If this number is negative, you are losing money on every sale. If it is thin, every operational decision matters a lot. If it is healthy, the business has room to invest.
Watch this at the order level, broken out by channel. Shopify and Amazon rarely have the same contribution margin per order, and often one of them is subsidising the other without anyone realising it.
2. True ROAS
Return on ad spend, calculated against your real contribution margin and not against reported revenue. True ROAS answers "did this ad budget pay for itself." It is one of the most useful numbers in ecommerce and one of the least often calculated correctly.
Watch this per platform, blended, and over time. A True ROAS that is trending down is a signal that acquisition is getting more expensive faster than your margin can absorb.
3. Repeat purchase rate
The share of your customers who come back. The economics of ecommerce are almost always built on repeat buyers. Acquisition is expensive, retention is cheaper, and lifetime value drives the business. If your repeat purchase rate is trending down, acquisition will have to work harder every month just to stand still.
Measure this by cohort, not just overall. Each monthly cohort of new customers has its own retention curve. The shape of those curves tells you more than any single average.
4. Cash conversion cycle
The number of days between paying for inventory and getting paid for the sales of that inventory. A short cash conversion cycle means the business funds its own growth. A long one means every push for revenue requires more working capital.
For ecommerce brands, this is often the quietest killer. A business that looks profitable on paper can still run out of cash if the cycle is too long. Watch days of inventory on hand, days of receivables, and days of payables as three parts of one number.
5. Stock out rate on top SKUs
The percentage of the time your top ten percent of SKUs by profit are available for purchase. Every stock out on a winner is lost revenue that is almost impossible to recover, because the customer buys from a competitor instead.
Measure this on the SKUs that make 80 percent of your contribution margin, not on the catalog average. A 95 percent in stock rate on the whole catalog can hide a 70 percent in stock rate on the SKUs that actually pay the bills.
6. Return rate by category
Returns reverse the sale and often cost more than the margin on the sale. Return rates vary significantly by category, and are typically higher in apparel than in home goods or consumables.
Watch returns by category and by product. A product with a 20 percent return rate and a 30 percent margin is not the same business as a product with a 5 percent return rate and the same margin.
How these six fit together
Each one answers a different question. Taken together, they describe the business:
- Contribution margin per order says whether the sales are making money.
- True ROAS says whether the acquisition is paying for itself.
- Repeat purchase rate says whether the customers come back.
- Cash conversion cycle says whether the business can fund its growth.
- Stock out rate says whether operations are keeping up.
- Return rate says whether the product and the expectation are matched.
A single dashboard with these six numbers, refreshed on a schedule and reviewed by a human each month, is a stronger decision tool than a hundred page analytics suite nobody reads. The point of a dashboard is not to show every number. It is to make the right decisions visible.