Conversion rate formula
Conversion Rate = (Total Conversions ÷ Total Visitors or Users) × 100 1,522 visitors with 266 conversions gives 266 ÷ 1,522 × 100 = 17.48%. The numerator is the count of whatever action you're measuring — purchases, signups, form submissions, whatever "conversion" means for what you're tracking. The denominator is the total population that had the opportunity to take that action, even if most of them didn't.
What actually goes in the denominator
It's tempting to think conversion rate is specifically about website visitors, or specifically about ad clicks, depending on which context you first learned it in. It's neither, exclusively. The denominator is whatever exposure or population could plausibly have produced the conversions you're counting — and that changes depending on what question you're actually asking.
This calculator uses total visitors or users as the denominator, so its result represents the percentage of that population that converted.
Say an ad campaign gets 1,000 clicks and those clicks lead to 50 purchases: 50 ÷ 1,000 × 100 = 5%. Now say a website (via any source, not just that ad) gets 1,000 visitors and 50 of them purchase: 50 ÷ 1,000 × 100 = also 5%. Same formula, same result, completely different questions. The first tells you how well an ad converts the people it reaches. The second tells you how well a site converts the traffic it gets, regardless of where that traffic came from. Clicks work as the denominator for ad-specific conversion rate — that's a real, common use case — but it's one specific choice of population, not the definition of conversion rate itself.
What matters isn't whether you call the denominator "clicks" or "visitors" or something else entirely. What matters is picking the population that actually had the chance to convert, so the resulting percentage answers the question you're actually asking.
Frequently asked questions
What's a good conversion rate?
Conversion rates vary widely by industry, traffic source, offer, device, and what counts as a conversion. Compare your rate with your own historical performance and relevant industry benchmarks rather than relying on one universal target.
Can conversion rate be different depending on what I choose as the denominator?
Yes, and that's expected, not a sign something's wrong. "Conversion rate from ad clicks" and "conversion rate from all site visitors" measure different things and will usually produce different percentages, even for the same underlying conversions. Be specific about which population you're measuring against when you report a conversion rate.
Can conversions be counted more than once per visitor?
For this calculator, yes — each visitor or user is treated as having at most one counted conversion. That's why the calculator won't accept more conversions than visitors. If your tracking counts multiple conversion events from the same person, you're measuring a different type of conversion or event rate, and this calculator isn't designed for that use case.