Conversion Rate & CPA Calculator
Enter clicks, conversions and spend to get your conversion rate and cost per acquisition. Add what a conversion is worth and your margin to see the most you can afford to pay for one.
The formulas
- Conversion rate = conversions ÷ clicks × 100. 54 conversions from 1,200 clicks is 4.5%.
- CPA (cost per acquisition) = ad spend ÷ conversions. $3,100 for 54 conversions is $57.41. Also called cost per lead (CPL) when the conversion is a lead.
- Break-even CPA = value per conversion × gross margin. A $180 sale at a 40% margin leaves $72 of profit before advertising, so $72 is the most you can pay to win it without losing money.
- How they connect: CPA = CPC ÷ conversion rate. A $2.58 click converting at 4.5% costs $57.33 per conversion. Halve the conversion rate and CPA doubles, whatever the bid.
Conversion rate and cost per lead benchmarks
| Channel or industry | Conversion rate | Cost per lead | Source |
|---|---|---|---|
| Search ads, all industries | 8.18% | $66.69 | LocaliQ 2026 search benchmarks |
| Facebook ads, lead campaigns | 7.72% | $27.66 | LocaliQ 2025 Facebook benchmarks |
| Search: Education & Instruction | 13.14% | — | LocaliQ 2026 search benchmarks |
| Search: Animals & Pets | 16.22% | — | LocaliQ 2026 search benchmarks |
| Search: Automotive repair & service | 15.51% | — | LocaliQ 2026 search benchmarks |
| Search: Physicians & Surgeons | 12.43% | — | LocaliQ 2026 search benchmarks |
| Search: Personal Services | 12.34% | — | LocaliQ 2026 search benchmarks |
| Search: Dentists & Dental Services | 10.67% | — | LocaliQ 2026 search benchmarks |
| Search: Beauty & Personal Care | 10.35% | — | LocaliQ 2026 search benchmarks |
Benchmarks: LocaliQ 2026 Search Advertising Benchmarks (Google and Microsoft Ads) and LocaliQ Facebook Advertising Benchmarks 2025. Averages across many accounts: useful to spot an outlier, not a target to manage to.
Facebook's lead-campaign conversion rate looks close to search, but most of those leads come from instant forms that never leave Facebook. They are cheap ($27.66 on average) and often lower quality, because filling in a pre-filled form takes one tap. Compare cost per qualified lead across channels, not cost per form.
Why your conversion rate might be wrong before it is low
- Counting settings. Google Ads can count "every" conversion or "one" per click. For leads, "one" is right; "every" lets a single person who submits twice inflate the rate.
- Micro-conversions mixed in. If page views, scrolls or button clicks are marked as primary conversions, the rate looks great and CPA looks cheap while sales stay flat. Only the action that makes money should drive bidding.
- Clicks versus sessions. Ad-platform clicks and analytics sessions never match exactly. Use the same source for both numbers in this calculator.
- Attribution windows. Meta credits conversions up to 7 days after a click by default; Google Ads uses 30. The same sale can appear in both, so adding the two together overstates the total.
Check the conversion setup, not just the rate
With MCP Ads connected, you can ask Claude: "List every conversion action in Google Ads, which ones are primary, how they are counted, and which campaigns spent money with zero conversions in the last 30 days." Most unexplained CPA problems turn out to be one of the four setup issues above.
Related tools
The step before the conversion: click-through rate against published search and Facebook benchmarks.
Break-even on the first sale is the floor. Lifetime value tells you how far above it you can bid.
The same break-even logic, expressed as a return on ad spend.
Find the campaigns spending without converting
Connect Google Ads and Meta Ads to MCP Ads and ask Claude for conversion rate and CPA by campaign, with the setup problems flagged.