Bandwidth

What It Means

Bandwidth is the maximum theoretical capacity of an internet connection, typically expressed in Mbps or Gbps, and is commonly conflated with speed in consumer marketing. The highway analogy is useful: bandwidth is the number of lanes, speed is how fast a single car (data flow) travels down those lanes. A 1 Gbps fiber connection has enough bandwidth to support 40 simultaneous Netflix 4K streams (25 Mbps each) without degradation, but a single 4K stream will not play any faster than it would on a 100 Mbps connection, streaming is bounded by the video bitrate, not the pipe size. The distinction matters most for multi-device households: a typical modern home has 15 to 30 connected devices (phones, smart TVs, laptops, tablets, smart speakers, security cameras, IoT sensors, game consoles), and a family of four with simultaneous video streaming, video calls, cloud backups, and game downloads can easily saturate a 200 Mbps plan. The FCC Broadband Nutrition Label discloses "typical" download and upload speeds, which is functionally a bandwidth disclosure. Real-world delivered throughput (see throughput entry) is typically 85 to 95% of advertised bandwidth due to TCP/IP overhead, Wi-Fi inefficiency, routing losses, and peak-hour congestion. The Broadband Grade uses advertised download bandwidth (from FCC BDC filings) as the primary input to its download speed subscore (40% of grade), with delivered throughput measurements from Ookla and M-Lab as a sanity check.

Frequently Asked Questions