Conversion Rate Calculator
Calculate conversion rate from conversions and a total you define — visitors, sessions, clicks, or leads — with an explicit note that these denominators aren't interchangeable.
The total must be a whole number — visitors are discrete counted events. Conversion events can be a decimal if your source data reports fractional attribution.
A conversion rate is only comparable to another conversion rate when the denominator means the same thing. "Conversions ÷ visitors", "conversions ÷ sessions", "conversions ÷ clicks", and "conversions ÷ leads" are four different, non-interchangeable metrics — a site with many repeat sessions per visitor, for example, will show a lower rate against sessions than against visitors for the exact same conversions. Always state which denominator you used when sharing a conversion rate.
Calculated entirely in your browser — nothing you enter here is sent to a server.
Conversion rate is the share of visits or interactions that resulted in a conversion — Conversion rate = Conversions ÷ Total × 100. What "Total" means changes the result: visitors, sessions, clicks, and leads are all valid denominators, but they're not interchangeable, so the same conversions figure produces a different rate against each one.
This is a different metric from CTR (which measures clicks against impressions, before any conversion happens) and from CPA (which measures cost, not rate).
How to use the Conversion Rate Calculator
- Choose what you're dividing by: Visitors, Sessions, Clicks, or Leads. This only changes the labels.
- Choose what your conversions number counts: Conversion events (every action) or Converting visitors (each counted once).
- Enter your conversions and the matching total (for example Total visitors) as a whole number.
- Click Calculate to see the rate and its formula, or Reset to start over.
Example: Same conversions, two denominators
With 87 conversions and 3,200 total visitors, Calculate shows 2.72%. Switching the label to Sessions and entering 4,100 sessions for the same 87 conversions shows 2.12%, which is why the denominator always needs to be stated.
Questions about the Conversion Rate Calculator
- Can the result be over 100%?
- Only for conversion events. When one visitor can convert more than once (for example Google Ads "Every" counting), 120 conversions from 100 visitors shows 120% with a note. With Converting visitors selected, the count can't exceed the total, so the same numbers give an error.
- Can I enter fractional conversions?
- Yes, for conversion events: 12.5 conversions from 800 visitors shows 1.56%, as attribution can split one conversion. Converting visitors are people or sessions, so they must be whole. The total must always be a whole number.
- How precise is the displayed rate?
- It is rounded to at most two decimal places, so 87 out of 3,200 (exactly 2.71875%) is shown as 2.72%.
- What if the total is zero?
- The tool refuses to calculate and explains that conversion rate is undefined without any visitors or interactions. Negative numbers are also rejected.