“Will do” is an informal response used to agree that you will do what someone has requested. It is concise and cooperative, but its informal register means a more explicit confirmation can be preferable when a formal record or precise commitment matters.
ReviewedEvidence1 sourceSectionPhrases & Idioms
Quick answer
“Will do” means “I will do that.” Cambridge marks it informal, so it works well in ordinary conversation and many work messages but may be too casual for some formal contexts.
Key details
Canonical FormWill Do
Core Meaningan informal way to agree to do something that has been requested
Registerinformal
Further guidance
Formality
Because the expression is informal, formal correspondence can use a fuller confirmation such as “I will take care of that” or state the action directly.
History Boundary
This guide makes no unsupported first-use or coinage claim; it publishes the supported current meaning and register.
Meaning
Use “will do” as a short acceptance of a request or instruction when the context already makes the task clear.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
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