Calculator

First Order vs Repeat Order Margin Calculator

A first order can look ugly and still be worth buying if repeat behavior cleans up the customer economics fast enough. Use this calculator to compare first-order margin against repeat-order contribution and see whether retention really rescues CAC.

Split first-order and repeat-order contribution clearly
Estimate blended customer contribution across repeat behavior
See how many repeats are needed to recover first-order CAC

Compare first-order and repeat-order margin

Enter order revenue, direct costs, fee rate, and your first-order CAC, then layer in expected repeat orders. The result shows whether the customer works only because of retention or whether the first order already carries its own weight.

Order value Gross revenue from the initial order. Product cost Direct unit or bundle cost. Fulfilment cost Pick-pack, shipping, or delivery burden. Fee rate % Processor or platform drag on the order. Other variable cost Packaging, inserts, or similar variable burden. First-order CAC Acquisition cost attached to the first purchase. Expected repeat orders Average additional orders after the first one.

Three retention scenarios.

Formula

What the customer model is testing

Blended customer contribution = (Order contribution - First-order CAC) + (Expected repeat orders × Order contribution)

The point is not to prove that retention is good. The point is to see whether repeat behavior actually repairs weak first-order economics fast enough to justify acquisition at the current CAC level.

Where teams over-trust repeat behavior

They celebrate LTV without checking whether the first order is too damaged.
Repeat assumptions get borrowed from good cohorts and applied to weak ones.
CAC is justified by retention stories instead of contribution reality.

Where to go next

Once customer contribution is clear, compare it against subscription math and DTC channel economics to decide whether retention deserves more focus than acquisition.