CPL calculator with the formula, a benchmark and the road to CAC

Cost per lead is total spend divided by the number of leads the spend produced in the same period. The only judgement call is what goes into each half. Spend should include everything you paid the platforms, and if you want a fully loaded number, the agency fee or the hours of the person running the account. A lead should be a defined event: a form fill, a booked call, an inbound phone call, a chat that gave you an email address. Mixing events, or counting a newsletter signup in the same bucket as a demo request, makes the number meaningless.

Calculate it per channel, not just per account. A blended CPL of €80 across Google and Meta hides that one channel is producing leads at €40 and the other at €160. The channel view is what decides where the next euro goes, which is the only reason to calculate CPL at all.

There is no universal good CPL. A €200 lead is cheap for a law firm closing €15,000 cases and ruinous for a €30 product. The number that decides whether a CPL is good is the revenue a lead turns into, which is why the calculator asks for close rate and deal size: CPL ÷ close rate is your customer acquisition cost, and deal size ÷ CAC is your return.

That said, ranges exist. B2B paid search and social typically produce leads between €40 and €200, with SaaS, finance and legal at the top and local services and e-commerce sign-ups at the bottom. Use the table below as a sanity check, not a target: your own CPL from three months ago is a better benchmark than any industry chart.

Three levers, in order of how much they move the number for how little they cost.

• Fix the count first. If your tracking misses a third of the leads a campaign produces, your CPL reads 50 percent too high and every decision downstream is wrong. Compare the ads manager with the CRM before touching the campaigns; the lost conversion calculator does the math.
• Conversion rate before bids. Doubling a landing page from 5 to 10 percent halves the CPL on the same media plan. No bid change achieves that.
• Creative before targeting. A better hook lifts click-through rate, which lowers CPC, which lowers CPL. Targeting changes move the number less than people expect.