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DSDownloadSpeed
Infrastructure

Data Cap

A limit on the total amount of data you can use per billing cycle, typically 1-1.2 TB for cable internet. Exceeding the cap triggers overage charges or throttled speeds.

What It Means

Comcast (Xfinity) imposes a 1.2 TB data cap in most markets, charging $10 per additional 50 GB up to $100/month. AT&T Fiber has no data caps. T-Mobile home internet has no hard cap but may deprioritize heavy users. A 1.2 TB cap accommodates about 480 hours of HD streaming or 160 hours of 4K streaming per month. Households with multiple 4K streamers, cloud backups, and large game downloads can exceed caps. Some ISPs offer unlimited data for an additional $25-30/month.

Frequently Asked Questions

What does "Data Cap" mean?

A limit on the total amount of data you can use per billing cycle, typically 1-1.2 TB for cable internet. Exceeding the cap triggers overage charges or throttled speeds.

Why does Data Cap matter for internet quality?

Comcast (Xfinity) imposes a 1.2 TB data cap in most markets, charging $10 per additional 50 GB up to $100/month. AT&T Fiber has no data caps. T-Mobile home internet has no hard cap but may deprioritize heavy users. A 1.2 TB cap accommodates about 480 hours of HD streaming or 160 hours of 4K streamin...

Related Terms

ISP (Internet Service Provider)
A company that provides internet access to consumers and businesses. Major U.S. ISPs include Comcast (Xfinity), Charter (Spectrum), AT&T, Verizon, and T-Mobile.
Last Mile
The final leg of the network connecting the ISP's infrastructure to the customer's home or business. The last mile is typically the most expensive part of broadband deployment.
Provider Competition
The number of ISPs offering broadband service in a given area. Areas with three or more competitors typically have lower prices and faster speeds than monopoly or duopoly markets.
Municipal Broadband
Internet service owned and operated by a local government or public utility, rather than a private ISP. Often provides faster speeds at lower prices than incumbent providers.

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About This Data

Definitions based on FCC standards, industry specifications, and federal broadband policy. Speed benchmarks reflect 2024 FCC standards. See our methodology.