You can make 300 calls and still leave most of a 500-person list untouched. If many of those calls went to the same people, the activity total won't reveal the gap.
List penetration measures coverage. For the calculation here, it's the share of distinct contact records in a defined list that received at least one dial attempt during a stated period. It doesn't tell you how many people answered or whether they were interested.
The formula—and the definition to check first
List penetration = distinct records attempted ÷ records in the defined list × 100.
Reporting tools don't always use the same counting rules. Genesys PureConnect, for example, distinguishes contact-record penetration from phone-number penetration and from repeated-attempt saturation. Check your report's definition before comparing it with another dashboard. This guide uses attempted contact records, not answered calls.
Suppose your Monday list has 500 distinct contact records. By Friday, your team has attempted 200 of them. Coverage is 200 ÷ 500 × 100 = 40%, even if retries brought the total to 600 calls.
Those 600 calls divided by the 200 attempted records give three attempts per attempted record on average. That average still doesn't mean every person received three calls. One could have received eight and another just one.
These numbers are an illustration, not a calling target or a Trellus benchmark.
A small example you can check by hand
Imagine a five-record list. Your call log shows this:
| Contact record | Attempts this week | Counts toward coverage? |
|---|---|---|
| A | 3 | Yes, once |
| B | 1 | Yes, once |
| C | 0 | No |
| D | 2 | Yes, once |
| E | 0 | No |
There are six attempts, but only three records were attempted. List penetration is 3 ÷ 5 = 60%. Dividing six calls by five records gives 120%; that's an attempt-volume ratio, not the coverage measure defined here.
An unanswered call still counts as an attempt in this example. Whether someone answered belongs in a separate conversation or contact-rate report. Use your team's agreed call outcome definitions rather than assuming every “connected” label means the same thing.
Keep the denominator steady
Save the list's membership and the reporting dates before you calculate. Otherwise, adding 100 new contacts on Friday can make coverage fall even though nobody stopped working.
Decide whether you're reporting on the original assigned list or a clearly defined eligible subset. Keep excluded records and exclusion reasons visible. Don't silently remove untouched records to improve the percentage, and don't call an excluded person just to complete the list.
Use a stable contact ID. A person with two phone numbers should count once in a contact-record report; a phone-number report answers a different question. Duplicate CRM records also deserve attention before you treat the result as coverage of unique people.
Copy this worksheet into your weekly review
Record these fields together:
- List name and saved membership date.
- Reporting start, end and time zone.
- Counting unit: contact record or phone number.
- Total records, excluded records and the denominator actually used.
- Distinct records attempted during the period.
- Total dial attempts during the same period.
- Coverage percentage and the count still unattempted.
- Reason for the largest untouched group and who will investigate it.
For an empty list, report “not applicable,” not zero percent. There's no denominator to divide by.
What to do with the result
Start with the untouched group. Were those contacts added late? Assigned to the wrong owner? Missing a usable number? Waiting for an agreed callback date? Each explanation calls for a different next step.
A higher percentage isn't automatically better. It could mean you reached more of the intended list, or simply that the list got smaller. It says nothing about meeting quality or revenue. Review coverage alongside conversations and follow-ups, then investigate the specific bottleneck.
If you're comparing dialers, keep list membership and counting rules consistent throughout the pilot. Our one-week dialer pilot checklist includes a daily worksheet for that comparison. Use the call disposition template to make outcomes and next actions easier to interpret, and the call-block planner to plan from your observed rates.
Source for the reporting distinction: Genesys PureConnect Penetration Rate view. The worked examples and worksheet above are illustrative.
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