The short answer
Break-even CPC is the click price at which expected order contribution covers advertising under your stated model. Calculate it from contribution per order and orders per click. Revenue per click is a different, larger amount because it has not deducted order costs.
Calculate your click allowance
Use one currency for amounts. The result is an average planning allowance, not an auction bid recommendation. Inputs stay in your browser. Displayed results are rounded.
Derive the click allowance
Target CPC = orders per click × (contribution per order − desired contribution after ads)
The order rate must use the same clicks you are pricing. Do not substitute a session conversion rate without explaining how sessions relate to those clicks.
Calculate a worked example
Illustrative inputs: 1,000 clicks produce 25 orders. Each order has $100 revenue and $60 of non-ad variable costs. Orders per click = 25 ÷ 1,000 = 0.025. Contribution per order = $100 − $60 = $40. Break-even CPC = 0.025 × $40 = $1.
If the planning goal is $12 left per order after ads, the target click cost becomes 0.025 × ($40 − $12) = $0.70. Across the example’s 1,000 clicks, spend would be $700. The 25 orders contribute $1,000 before ads, leaving $1,000 − $700 = $300, or $12 each.
Test the uncertain input
If the same offer converts only 15 orders from 1,000 clicks, the break-even click allowance falls to 0.015 × $40 = $0.60. The original $1 ceiling would no longer cover the modeled costs. Historical conversion behavior is an input to investigate, not a promise about additional traffic.
Use the ceiling as a planning check
An average affordable CPC is not automatically the correct maximum bid in an advertising system. Actual auction costs, traffic mix, and value differ. Keep this model separate from platform-specific bidding controls. If contribution is nonpositive, there is no positive break-even CPC for the stated order model.
Review the rate after sufficient conversion time, and update contribution when prices, refunds, or costs change. Use the result to judge whether the planned traffic economics are plausible before setting a budget.
Translate order economics into click cost
- Gather: Use matched orders per click and contribution per order before ads.
- Produce: Reserve the desired contribution before multiplying by the order rate.
Decision boundary: An affordable average CPC is not automatically an appropriate maximum auction bid.
Next reading
Examples are illustrative, not client results or benchmarks. The calculations use the inputs shown; real-world decisions depend on your records and assumptions. Report a correction.