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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

A data cap is a monthly usage limit on the total volume of data a subscriber can transfer, enforced by the ISP with overage charges, throttled speeds, or service suspension when exceeded. Cable operators have historically been the primary enforcers of data caps in the United States: Comcast Xfinity imposes a 1.2 TB monthly cap in most markets (but not in the Northeast, where Verizon Fios competition disciplines pricing), charging $10 per additional 50 GB up to a $100 per month maximum, or offering unlimited data as a $30 per month add-on. Cox Communications caps at 1.25 TB with similar overage pricing. Charter Spectrum, notably, does not impose residential data caps. Fiber operators almost universally offer unlimited data: AT&T Fiber, Verizon Fios, Google Fiber, and Frontier Fiber all have no caps. T-Mobile Home Internet has no hard cap but reserves the right to deprioritize heavy users (those consuming over roughly 1.2 TB per month) during network congestion. Starlink residential has no hard cap. Traditional GEO satellite (HughesNet, Viasat) imposes hard caps of 100 to 300 GB, after which speeds throttle to 1 to 3 Mbps. Context on usage: a 1.2 TB cap supports roughly 480 hours of HD streaming, 160 hours of 4K streaming, or 40 hours of 8K streaming per month. Households with multiple 4K streamers, cloud backup (Backblaze, iDrive), large Xbox or PS5 game downloads (commonly 50 to 150 GB per title), and smart home camera cloud recording routinely exceed 1 TB per month. The Broadband Grade does not explicitly weight data caps but flags capped plans in the plan details.

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?

A data cap is a monthly usage limit on the total volume of data a subscriber can transfer, enforced by the ISP with overage charges, throttled speeds, or service suspension when exceeded. Cable operators have historically been the primary enforcers of data caps in the United States: Comcast Xfinity ...

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.

this entity is one of the U.S. internet availability and broadband speed concepts that recurs across this site. The definition above is the technical answer; the paragraphs below add the practical context for how the concept connects to the the FCC Broadband Data Collection (BDC) data behind every per-entity page on the site.

In the the FCC Broadband Data Collection (BDC) data, this concept shapes one or more of the fields that drive the per-entity grades and rankings on this site. The methodology page describes which fields feed into which output; this glossary entry documents the underlying term.

Source: FCC Broadband Data Collection, 2026.