How to calculate the size of your call tracking number pool
A call tracking number pool is a collection of unique phone numbers used to track and measure the performance of marketing campaigns and / or user sessions on your website. By using dynamic number insertion and number pools, you can gather valuable data about the session details of your leads and optimize your marketing efforts.
The best way to calculate the size of your tracking number pool is Google Analytics. In Google Analytics all you need is to find your hourly visitors and the average session duration. From there on you can use the following formula:
[HOURLY VISITORS] / [60 / average session duration] * 1.3
If for instance your peak is 200 users and the average session duration is 3 minutes the pool of tracking numbers needed is 200/[(60/3)*1.3] = 13 tracking numbers.
Below are 4 ways to calculate your website pool:
Log in to Google Analytics and use the following steps to calculate your tracking number pool.
Choose Explore from the left menu.
Choose Blank from the reporting options.
In the Segments field choose None.
In the Dimensions field choose Date + hour.
In the Metrics field choose Sessions and Average Session duration
In the Technique field choose Free form
In the Visualization field choose Table
In the Rows field choose Date + hour
In the Values field choose Sessions and Average Session Duration.
You should see the following table from which you want to sort by Sessions ascending order and grab the Session value and the Average session duration. Then apply these two values in the formula we shared above.
Log in to Google Analytics and use the following steps to calculate your tracking number pool.
Choose Explore from the left menu.
Choose Blank from the reporting options.
In the Segments field choose None.
In the Dimensions field choose Date + hour.
In the Metrics field choose Sessions
In the Granularity field choose Hour
In the Values field choose Sessions.
You should see the following chart from which you want to find the peak. This is the Session value you want to add to the formula.
If creating explore reporting in Google Analytics 4 seems a bit technical to you, Nimbata has a neat tool called Pool Estimator, which calculates the optimal pool number automatically with a few button clicks. Here’s how:
How to calculate the size of your number pool:
The best way to calculate the size of your tracking number pool is Google Analytics. In Google Analytics all you need is to find your hourly visitors and the average session duration. From there on you can use the following formula:
[HOURLY VISITORS] / [60 / average session duration] * 1.3
If for instance your peak is 200 users and the average session duration is 3 minutes the pool of tracking numbers needed is 200/[(60/3)*1.3] = 13 tracking numbers.
Below are 4 ways to calculate your website pool:
Table report in Google Analytics 4
Log in to Google Analytics and use the following steps to calculate your tracking number pool.
Choose Explore from the left menu.
Choose Blank from the reporting options.
In the Segments field choose None.
In the Dimensions field choose Date + hour.
In the Metrics field choose Sessions and Average Session duration
In the Technique field choose Free form
In the Visualization field choose Table
In the Rows field choose Date + hour
In the Values field choose Sessions and Average Session Duration.
You should see the following table from which you want to sort by Sessions ascending order and grab the Session value and the Average session duration. Then apply these two values in the formula we shared above.
List chart in Google Analytics 4
Log in to Google Analytics and use the following steps to calculate your tracking number pool.
Choose Explore from the left menu.
Choose Blank from the reporting options.
In the Segments field choose None.
In the Dimensions field choose Date + hour.
In the Metrics field choose Sessions
In the Granularity field choose Hour
In the Values field choose Sessions.
You should see the following chart from which you want to find the peak. This is the Session value you want to add to the formula.
Nimbata pool estimator
If creating explore reporting in Google Analytics 4 seems a bit technical to you, Nimbata has a neat tool called Pool Estimator, which calculates the optimal pool number automatically with a few button clicks. Here’s how:
Updated on: 22/01/2025
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