What is 95th percentile billing?

Understanding 95th Percentile Billing

The 95th percentile is a mathematical calculation widely used to determine billings for Internet connections that are provided as "burstable" (variable rate) bandwidth.

Essentially, your connection to the Internet will be 100, 1,000 or 10,000 Mbit/s, and you are permitted to consume as much bandwidth as you wish. If your monthly consumption is within this allowance there are no overage charges, however, if your ABR (Average Bit Rate) exceeds your chosen plan by more than 10% of 1 unit (as found in the specifications below the plans), we will round your ABR to the next unit up and add it to your next bill.

Usage graphs are available in your user portal, and if you wish to pre-emptively upgrade your plan you can do so by contacting customer support.

We'll explain how your actual bandwidth consumption is calculated below and how this information is used to determine any additional service charges that may apply to your Hayai service. It is important when choosing a subscription for a bandwidth allowance that you choose a bandwidth allowance suitable to your needs.

Metering Your Consumption

Bandwidth consumption is a calculated value. It works like this:

  1. Every 30 seconds Hayai takes readings off of the network switch that services your account.
  2. These readings return the amount of network traffic that has passed through the port that services your equipment, returning the number of bytes of information that has entered and left your service.
  3. These values are added together to provide five minute totals.
  4. These totals are then translated into kilobits and divided by the number of seconds that have passed in order to establish the total amount of bandwidth that entered and left your service, expressed in kilobits per second (Kbit/s).
  5. Bandwidth is calculated separately for both inbound and outbound traffic and your bandwidth consumption is the sum of these two values.

At the end of each month these readings are sorted and the top 5% of these readings are removed. The next highest reading (called "the 95th percentile") determines if any excessive use of network traffic has occurred and determines the amount of excess service fees that would apply.

Here is a simple example that illustrates how it works:

100 readings of both incoming and outgoing traffic have been recorded over a period of 500 minutes, Given that the billing period is 500 minutes (for the purpose of this example, although in reality it would be 43,200 minutes), then the top 5% of the readings (the top 5 readings, in this case) are ignored, and you are billed at the value of the 95th reading.

If the top 10 readings of this set of 100 were:

Top 10 Entry Reading Comment
100 40,090 Kbit/s Ignored (top 5%)
99 37,900 Kbit/s Ignored (top 5%)
98 32,200 Kbit/s Ignored (top 5%)
97 29,600 Kbit/s Ignored (top 5%)
96 27,400 Kbit/s Ignored (top 5%)
95 26,250 Kbit/s ** "95th Percentile"
94 25,140 Kbit/s  
93 24,930 Kbit/s  
92 23,120 Kbit/s  
91 22,100 Kbit/s  

In this case, even though you sometimes sustained traffic at speeds as high as 40,090 Kbit/s, your actual 95th percentile consumption was 26,250 Kbit/s. If your subscription included 30,000 Kbit/s of network traffic, then your usage is well below your threshold.

What happens if you exceed your allowance?

If you exceed your allowance you will be invoiced for the additional bandwidth that your service consumed. These additional fees are invoiced at a fixed rate, as defined by your chosen plan.

Can I increase my Bandwidth Allowance?

Yes. For information on increasing your Bandwidth Allowance please contact a Hayai sales or customer service representative.

Is there a way for me to view how much traffic my service is using?

Yes. Simply log in to your account and your traffic graph will be displayed for you, including your 95th percentile calculation, as per this sample image:

95th percentile example