Find your cost per lead from ad spend and leads generated — and what each customer costs once you factor in your close rate.
Cost per lead = spend ÷ leads. Cost per customer divides the same spend by leads that actually convert, so a low CPL with a poor close rate can still be expensive. Compare cost per customer to your margin or lifetime value, not just order value. General information only.
Cost per lead tells you what each inquiry costs; cost per customer tells you what a paying customer costs once your close rate is applied. The gap between them is your sales efficiency — a cheap lead that rarely converts can cost more per customer than an expensive one that closes reliably.
Cost per lead = spend ÷ leads · Cost per customer = spend ÷ (leads × close rate)
Cost per customer, ultimately — it accounts for lead quality. A channel with a higher CPL but a much better close rate can be the cheaper source of actual customers.
Cost per customer here is essentially customer acquisition cost for this campaign. Compare it to customer lifetime value to know if the spend pays off.
Related: customer acquisition cost calculator · cost per click calculator · LTV to CAC ratio calculator · all free calculators.
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It uses standard formulas and recalculates the moment you change a value, so the math is exact for the inputs you enter. Treat the result as a reliable planning estimate; for decisions with legal or tax consequences, confirm the figures with a qualified professional.
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Last reviewed: September 2026. Free to use, no signup — Cost Per Lead Calculator by ToolWise Digital.
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