Bandwidth vs Capacity

When to use each in English, with meaning, register, and examples.

Bandwidth

Top 2,000 (common)

Capacity

Top 2,000 (common)B2noun
 BandwidthCapacity
Pronunciation🇬🇧 //ˈbændwɪdθ//🇺🇸 //ˈbændˌwɪdθ//🇬🇧 //kəˈpæs.ɪ.ti//🇺🇸 //kəˈpæ.sɪ.ti//
MeaningThe amount of data that can be transmitted in a given time.How much something can hold or do.
ExampleThe internet connection has high bandwidth, allowing multiple devices to stream simultaneously.The capacity of the stadium is 50,000 people.
RegisterNeutralNeutral
How commonTop 2,000 (common)Top 2,000 (common)
CEFR level-B2
Part of speechnoun
Collocationsincrease bandwidth, reduce bandwidth, positive bandwidth, manage bandwidthfull capacity, seating capacity, at capacity, capacity limits
Antonyms-inability, incapacity
Common mistakesConfused with 'bandwidth' as a physical dimension., Using 'bandwidth' when referring to speed rather than capacity., Mispronouncing 'bandwidth' in casual conversation.Confused with 'capability', which refers to ability rather than volume., Using 'capacity' for individual abilities when 'capability' is more appropriate., Mispronouncing the word with emphasis on the wrong syllable.
Usage notesCommonly used in technology and telecommunications. May not be appropriate in casual conversations or non-technical contexts.Used in both formal and informal contexts. Common in discussions about limits or ability. Not typically used in casual conversation unless referring to space or limits.

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Capacity

Frequently asked questions: Bandwidth vs Capacity

What's the difference between Bandwidth and Capacity?

Bandwidth: The amount of data that can be transmitted in a given time. Capacity: How much something can hold or do.

Can you show an example of each?

Bandwidth: The internet connection has high bandwidth, allowing multiple devices to stream simultaneously. Capacity: The capacity of the stadium is 50,000 people.

Can I use Bandwidth and Capacity interchangeably?

Not always. Bandwidth and Capacity are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.