Megabit per second to Terabit per second

Because ISPs advertise in megabits (Mb) while download managers show megabytes (MB). There are 8 bits in a byte, so 100 Mbps ÷ 8 = 12.5 MB/s. Your connection is working perfectly — it is just a unit mismatch that has confused people for decades.

Netflix recommends 25 Mbps for 4K, YouTube suggests 20 Mbps, and Apple TV+ needs about 25 Mbps. In practice, 50 Mbps gives comfortable headroom for one 4K stream plus normal browsing. A household streaming on multiple devices simultaneously should aim for 100+ Mbps.

Wi-Fi shares bandwidth among all connected devices, loses throughput to interference from walls and other electronics, and uses half-duplex communication (it cannot send and receive simultaneously). A 300 Mbps Wi-Fi router might deliver 100–150 Mbps to a single device in practice, while Ethernet gives you the full rated speed.

Download Mbps measures data coming to you (streaming, browsing), while upload Mbps measures data you send (video calls, cloud backups). Most home connections are asymmetric — 100 Mbps down but only 10–20 Mbps up. Fiber-to-the-home plans increasingly offer symmetric speeds.

Surprisingly little — most online games use only 1–3 Mbps of bandwidth. What gamers actually need is low latency (ping), not high throughput. A 10 Mbps connection with 15ms ping will outperform a 500 Mbps connection with 100ms ping for gaming every time.

Global internet traffic peaks at roughly 1,000–1,500 Tbps (1–1.5 Pbps) as of 2026. This is growing at about 25% per year, driven by video streaming, cloud computing, and AI training data transfers. A single viral live event can spike regional traffic by tens of Tbps.

Internet traffic automatically reroutes through other cables and paths via BGP routing protocols, usually within seconds. Speed may degrade in the affected region but rarely drops entirely. Cable cuts happen more often than people think — about 100 per year globally, mostly from ship anchors and fishing trawlers.

Dense wavelength-division multiplexing (DWDM) sends dozens of different light colors (wavelengths) through a single fiber simultaneously, each carrying its own data stream. A modern cable contains multiple fiber pairs, each carrying 100+ wavelengths, with each wavelength modulated at 400 Gbps or more.

Netflix's library is estimated at around 30–40 petabytes. At 1 Tbps, downloading the entire catalog would take roughly 70–90 hours. At 100 Tbps (a realistic submarine cable capacity), you could theoretically grab all of Netflix in under an hour.

Researchers at Japan's NICT achieved 22.9 Pbps (22,900 Tbps) through a single multicore fiber in 2024. That is enough to transfer the entire Library of Congress in a fraction of a second. These lab records typically reach commercial deployment 5–10 years later.