Unit economics: measure what one sale contributes

A unit might be an order, an appointment, an active subscriber or a delivered project. Define it before collecting numbers. Mixing orders with customers produces ratios that are hard to interpret, particularly when customers buy repeatedly. Write down the time period and what counts as completed delivery. For a service business, unpaid rework and cancellations can materially change the economics even though they do not create a new invoice.

Start with collected sales after discounts and refunds. Subtract costs directly associated with serving that unit: purchased materials, delivery charges, payment processing and incremental labor where appropriate. Keep the allocation rule visible. A cost can be fixed for today’s capacity but variable when the business hires another crew. Report contribution separately from operating profit so readers do not mistake a profitable order for a profitable company. Rent, management and systems still need to be funded.

Consider an online order with $100 of net revenue, $45 of merchandise cost, $8 of shipping, $3 of processing and $4 of expected return handling. Modeled contribution is $40. If acquisition costs $25 per new customer and that customer buys once, $15 remains to cover other overhead and uncertainty. If the customer buys again, calculate repeat economics separately; do not assume repeat purchases simply because they would improve the forecast.

Group customers by acquisition period or channel and watch what happens as they mature. An overall average can conceal a recent campaign that attracts lower-value orders or higher returns. Test price changes with contribution, delivery capacity and repeat behavior together. Record uncertainty around lifetime estimates and distinguish observed revenue from projected revenue. The practical decision is whether the business can acquire and serve the next customer sustainably, given its actual cash cycle and fixed commitments.

Use columns for unit definition, net sales, variable cost, contribution and the source of each amount. Put observed results and future assumptions in separate rows. Add an operational note if a channel produces unusual support work or returns. Reconcile the report to accounting totals before using it for a budget decision. If the sum of orders does not match the period sales figure, understand the timing or missing records first. A precise-looking contribution percentage is not useful when the underlying units are inconsistent.