Check what a conversion-rate claim actually counts

There is no useful answer to “is that a good conversion rate?” without the definitions behind it. One fictional dataset below produces 0.2% and 11.0% — both arithmetically correct — because the numerator, denominator, period, and segment are different. So this page gives you the arithmetic and the questions instead of a number to compare against.

That refusal is not a dodge. A rate you can defend is worth more than a rate you can look up, and the only honest comparison is your own rate against itself over time, under one written-down definition.

The five parts that make a rate mean something

A conversion rate is a fraction with definitions attached. Before a percentage can be compared with anything, write down:

1. What counts as a conversion. A submitted form, a phone-number tap, a text-message tap, an email tap, a completed booking, or a person somebody later called qualified are different events.
2. What counts as a visit. Sessions, users, and pageviews are three different denominators.
3. The period. A week cannot be compared honestly with a year just because both figures end in a percent sign.
4. The segment. All traffic, organic traffic, paid traffic, and one device group describe different populations.
5. Whether both sides use the same four rules. A before-and-after is only a comparison when its definitions match.

The calculator accepts only the facts the reader supplies. It does not convert sessions into users, turn a month into a year, or fill a blank with a typical value.

One fictional dataset, four honest rates

Northline Cabinetry is fictional. These figures are invented to demonstrate the method, not to describe a typical business.

Figure	Count
Pageviews, full year, all traffic	61,400
Sessions, full year, all traffic	18,900
Users, full year, all traffic	14,200
Quote-form submissions, full year	132
Phone-number clicks, full year	389
Email-address clicks, full year	44
Booking completions, full year	61
Organic quote-page sessions, October	127
Quote-form submissions, October	14

The arithmetic produces four different, accurately labelled statements:

• 0.2% — 132 quote forms ÷ 61,400 pageviews, full year, all traffic.
• 0.9% — 132 quote forms ÷ 14,200 users, full year, all traffic.
• 3.3% — 626 bundled events ÷ 18,900 sessions, full year, all traffic.
• 11.0% — 14 quote forms ÷ 127 organic quote-page sessions, October.

The figures can all be divided correctly and still be unfit for comparison.

Calling 0.9% the “before” and 11.0% the “after” would create the appearance of a dramatic change without establishing that business performance changed. The numerator definition, denominator, period, and segment changed together. That is why the fifth check matters more than the arithmetic.

Checking a before-and-after, or a promised lift

Most claims an owner is handed are comparisons: “you are at 2% and we get clients to 6%,” or “we lifted them 40%.” A comparison is only a comparison when both sides use the same four rules, and that is the one thing no calculator can check for you — it lives in the two source reports.

The procedure is the same as above, run twice:

1. Fill in the calculator for the “before” number and keep its record.
2. Fill it in again for the “after” number and keep that record.
3. Put the two records side by side and compare four lines: what counted as a conversion, what counted as a visit, the period length, and the segment.
4. If any one of those four differs, the two percentages are not a clean before-and-after. They are two different measurements, so the difference cannot be attributed to business change until the definition drift is resolved.

A 40% lift is a claim about two fractions. Ask which two.

Invert the claim before you argue with it

If somebody quotes 6% and supplies one side of the fraction, solve for the missing side.

• With 47 conversions, 6% implies a denominator of about 783.
• With 1,300 visits, 6% implies a numerator of about 78.

If the report shows different figures, that does not show anybody is wrong. It is a precise reason to ask which definition, period, or segment differs.

Write the rate as a sentence, not a percentage

A percentage on its own loses its definitions the moment it is forwarded. Write it as one line instead, with every part attached:

Form submissions ÷ sessions, over a month, organic search only — 47 ÷ 1,300 = 3.6%

That sentence survives being pasted into an email. “3.6%” does not. The calculator writes this line for you once both figures and the visit definition are in, and names any part you have left unstated rather than dropping it.

How to interpret the output

• A blank is a result. It names a definition the claim did not supply.
• Zero percent is a result. It means a valid denominator was supplied and the stated numerator was zero.
• A zero denominator is not zero percent. The division has no rate.
• More conversions than visits is not rendered as a percentage. The two figures need to be reconciled before they can describe one rate.
• A bundle has a total but no split. Any one part can be no larger than the whole, but the calculator will not invent the individual counts.
• A clean division is still only arithmetic. It does not verify the report that supplied the figures.

For the longer explanation of why published rates disagree, read what a service-business conversion rate actually measures. For the separate problem of analytics totals disagreeing with business records, read why website analytics and lead records do not match.

Questions to send back

Use whichever questions remain unanswered:

1. What number were you dividing? How many conversions, exactly?
2. What counts as a conversion in that number?
3. Is that one kind of conversion or several added together? If several, what is the split?
4. What number were you dividing by? How many visits, exactly?
5. Does “visits” mean sessions, users, or pageviews?
6. What period does the rate cover?
7. Is it all traffic or one segment?
8. If “qualified lead” is included, who decides what qualifies?
9. Which report does the percentage come from?
10. If this is a before-and-after, do both numbers use the same conversion definition, visit definition, period length, and segment?

Question ten cannot be answered by this page. It has to be confirmed in the two source reports.

A blank record to print

Write only what the source actually states. Leave the rest blank. One claim uses the first column; a before-and-after uses both, and the comparison is only valid when the middle five rows match across them.

Field	Claim A / before	Claim B / after
Claimed rate	_______________	_______________
Number on top	_______________	_______________
What the number on top counts	_______________	_______________
Number on the bottom	_______________	_______________
Sessions, users, or pageviews	_______________	_______________
Period	_______________	_______________
Segment	_______________	_______________
Source report and date	_______________	_______________
Who confirmed the definitions	_______________	_______________

Then record each division:

______ conversions ÷ ______ visits × 100 = ______ %

If either figure is missing, if the denominator is zero, or if the numerator is greater than the denominator, record that state in words instead of forcing a percentage.

What this cannot tell you

• This does not tell you what a good conversion rate is.
• This does not estimate leads, sales, revenue, or money lost.
• This does not predict what a website change would do.
• This does not audit analytics or verify the figures entered.
• This does not accuse anyone of lying.
• Arithmetic alone does not verify a definition; a clean division can still describe the wrong thing.

Nothing typed into the calculator is sent or saved by the tool. Copy, download, and print all produce a plain-text or paper record in the browser. No result is placed in the page address or a contact link.