Marketing Cockpit

What is unit economics, and why four numbers settle it

Unit economics is the profit and loss of a single unit — here, one customer — rather than of the business as a whole. It asks whether the thing you are about to do more of makes money at all, which is a different question from whether the company is currently profitable. Four inputs settle it: what a customer costs to acquire, what they spend per order, how much of that survives the cost of goods, and how many times they come back. Everything on this page follows from those four, and the ratio they produce is the one investors read first.

Profit per purchase = AOV × (margin ÷ 100)
CLV = profit per purchase × purchases per customer
LTV:CAC = CLV ÷ CAC

The four growth levers multiply rather than add

• Acquisition cost (CAC): the most direct lever. Cut CAC by 20 % and the ratio improves by the same proportion, immediately. Tighter targeting, cheaper channels and a better conversion rate are the usual routes — the CAC calculator breaks the number down.
• Average order value: every extra dollar per order raises lifetime value in a straight line without moving acquisition cost at all. Upsells, bundles and a free-shipping threshold are the classic instruments.
• Gross margin: the lever that gets overlooked. Going from 30 % to 40 % margin raises profit per purchase by a third on identical revenue — nothing has to be sold twice. Supplier terms and product mix are where it is won.
• Purchases per customer: the retention lever, and the only one that costs nothing per unit. Repeat purchases through email, loyalty and decent service multiply lifetime value without a dollar of new acquisition spend. The customer lifetime value calculator works it out in more detail.

A unit economics example, worked from four inputs

AOV $90, gross margin 50 %, four purchases per customer, CAC $60:

At a CAC of $60 the acquisition has paid for itself during the second purchase (2 × $45 = $90 of profit). The third and fourth purchases are pure gain. Put your own figures into the sliders above.

Customer profitability at 3:1, at 1:1, and above 5:1

3:1 or better is treated across industries as sound: you recover three times what you put in, with enough left over for overhead, returns and reinvestment. Between 1:1 and 3:1 is often still profitable but fragile — an unexpected cost increase or a slipping conversion rate eats the difference quickly. Below 1:1 you lose money on every customer you win, and no amount of volume fixes that. Above 5:1 is not simply better news: it usually means you could be buying more customers than you are. One caveat on the ROAS card above — it divides lifetime revenue by a one-off acquisition cost, so it reads far higher than campaign ROAS and the two are not comparable. For the campaign figure use the ROAS calculator.

How many purchases before a customer has paid for themselves

Break even in purchases is how many transactions it takes for cumulative profit to cover the acquisition cost: break even = CAC ÷ profit per purchase. At a CAC of $50 and $50 of profit per purchase it lands exactly on the first purchase, and everything from the second on is gain. The number matters because it is what your cash flow has to survive — a model that breaks even on the fourth purchase needs the customer to stay long enough to make four. To turn the same figures into bid ceilings, a maximum CPA and a maximum CPC, use the break even ROAS calculator.

Which profit drivers to move first

• Conversion rate before budget: more conversions on the same spend lower CAC proportionally, which is the cheapest improvement available to you. Measure where you stand with the conversion rate calculator before adding money.
• Retention before acquisition: raising purchases per customer costs markedly less than winning new ones. Email flows and loyalty programmes come before a bigger ad budget, not after it.
• Protect the margin: discounting lifts conversion and cuts margin at the same time, and the trade is often a bad one. Check that the ratio still holds after a promotion, not just that revenue rose.
• Do not scale below 3:1: raising budget while the ratio sits under 3:1 scales the losses along with everything else. Fix the model first, then grow hard. Across all channels at once, the marketing efficiency ratio calculator is the wider view.