How to Accurately Measure Website Traffic and Calculate Required Bandwidth

Website traffic (traffic) refers to the number of visits and page views a site receives. Common metrics include unique users, total users (including repeat visitors), page views, pages per user, and average session duration.

Traffic measurement typically uses two indicators: IP (independent IP) and PV (page view), often calculated on a daily basis as daily unique IPs and PVs.

IP (Internet Protocol) count counts each distinct IP address once per day (00:00‑24:00). PV (Page View) counts each page request; every refresh is counted as an additional view.

The relationship between IP and PV: a high PV does not necessarily mean many visitors; PV is proportional to visitor count but does not directly reflect the true number of unique visitors. For example, a single visitor can generate many PVs by repeatedly refreshing pages.

IP reflects a virtual network address, while a unique user reflects an actual visitor. Using unique users as a metric provides a more accurate picture of how many real people accessed the site within a given time frame.

One unique IP can generate multiple PVs, so PV ≥ IP.

PV value is the total number of pages requested by all visitors within a specific period (e.g., 500 visitors each viewing an average of 8 pages results in 4,000 PV per day). Hits count requests for each page element (images, flash files, etc.). Daily traffic bytes represent the sum of bytes for all page elements requested in a day.

Calculating required bandwidth focuses on two metrics: peak traffic and average page size. Example assumptions:

Peak traffic is 5 times the average traffic.

Average page size is 200 KB.

Target is 500,000 PV per day.

Assuming traffic is evenly distributed, 500,000 PV per day equals about 6 requests per second (500,000 ÷ 86,400 ≈ 6). At 200 KB per request, this is 1,200 KB per second, which equals 9 Mbps (1 Byte = 8 bits). Multiplying by the peak factor (5) yields an estimated required bandwidth of roughly 45 Mbps.

The concrete formula is:

Required bandwidth (bits per second) = (Daily PV ÷ Seconds per day) × Average page size (KB) × 8