Amount / Number / Quantity
UsageUse amount with uncountable nouns and number with countable nouns. Quantity is more formal and can be used with either, depending on context.
Amount
Use when
You are referring to something uncountable or measured as a mass.
Example
“The team reduced the amount of time needed for each review.”
Number
Use when
You are referring to separate people or things that can be counted.
Example
“The number of unresolved cases fell in July.”
Quantity
Use when
You need a more formal term that can apply to countable or uncountable things, often with a size adjective.
Example
“The warehouse received a large quantity of supplies.”
Quick check
amount of applications, number of time, quantity used when a plainer amount or number would do
Usage note