What is conversion rate?
Short answer: conversion rate is the percentage of visitors who complete the action you care about. Conversion rate = conversions ÷ visitors × 100. It is the quiet multiplier behind break-even CPC, CPA, and ROAS — small changes here move everything.
Of all the inputs in ad math, conversion rate is the one people under-rate. Marketers obsess over CPC while a half-point lift in conversion rate would do far more for the bottom line. Here is why it matters so much.
It multiplies through every metric
Break-even CPC = profit per order × conversion rate. CPA = CPC ÷ conversion rate. Raise conversion rate and you simultaneously increase how much you can bid and lower how much each customer costs. No other single input touches both sides at once.
How to improve it
- Match the landing page to the ad’s promise — message mismatch kills conversions.
- Cut page load time; speed is a conversion feature.
- Add trust signals and remove friction from the checkout or form.
See how a conversion-rate change moves your ceiling in the break-even CPC calculator. For a deeper playbook, read how to improve conversion rate.
FAQ
What is a good conversion rate?
It varies by industry and price point. Track your own trend rather than chasing a benchmark. See what is a good conversion rate.
Why use campaign-level rates?
Paid, cold traffic usually converts lower than your sitewide average — use the rate that matches the traffic you are buying.