Due to and because of both introduce causes in modern English. A traditional editing rule assigns due to to a noun and because of to an action, but current usage is more flexible.[1][1] The best choice depends on whether a writer is following that traditional convention, using ordinary modern prose, or revising for clarity.
What Do Due to and Because of Mean?
Both phrases answer a cause question, but the traditional grammatical analysis gives them different attachments. Under that analysis, due to modifies a noun or pronoun, while because of modifies a verb.[1]
| Intended structure | Traditional choice | Example | Useful replacement test |
|---|---|---|---|
| Cause attributed to a noun | due to | The cancellation was due to fog. | The cancellation was caused by fog. |
| Reason for an action | because of | The airline canceled the flight because of fog. | The airline canceled the flight on account of fog. |
| Ordinary modern causal phrase | either may occur[1][2] | The delay was due to/because of traffic. | Choose for style and clarity. |
| Concise clause | because | We left because the office closed. | Avoid due to the fact that. |
The substitution test expresses the traditional distinction. Due to is generally interchangeable with caused by, while because of is generally interchangeable with on account of.[1] Another usage source similarly recommends attributable to, caused by, or resulting from as tests for traditional due to.[2]
- The outage was due to a damaged cable.
- The outage was caused by a damaged cable.
- The network failed because of a damaged cable.
- The network failed on account of a damaged cable.
These pairs describe the same event from different grammatical structures. The first pair attributes a cause to the noun outage. The second pair explains why the verb failed occurred.
Because of can follow a verb phrase and supply its reason, as in “She left because of her early curfew.”[3] The same broad pattern allows an original linking example: “The change was because of a scheduling conflict.” A writer can compare its rhythm with “The change was due to a scheduling conflict.”
The phrase due to the fact that is usually longer than needed. A usage source recommends replacing it with because for concision.[4]
- Wordy: The match ended early due to the fact that the lights failed.
- Concise: The match ended early because the lights failed.
That revision compares a prepositional phrase with a conjunction, not merely due to with because of. Use because of before a noun phrase: “The match ended early because of the lighting failure.”
Practice the shift with one more original pair: “The picnic ended because of the storm” becomes “The storm caused the picnic to end.” The rewrite makes the action and its cause explicit without relying on either target phrase.
How Do Due to and Because of Differ?
The noun-versus-action distinction is a scoped traditional prescription, not a universal verdict on every modern sentence. The source that records the traditional restriction also says modern style guides increasingly abandon it.[1] Another source says that modern meanings have merged somewhat even though the historical uses differed.[2]
Under strict traditional editing, these are the preferred patterns:
- The postponement was due to snow.
- The organizers postponed the event because of snow.
The traditional rule treats due as an adjective placed after a form of be, while because of can modify an action more broadly.[4] This model is useful when a publication’s house style explicitly requires it.
Modern prose often uses sentence-initial or action-modifying due to:
- Due to snow, the organizers postponed the event.
- The organizers postponed the event due to snow.
Do not label these model-created examples universally ungrammatical. The evidence describes modern flexibility, so an editor must identify the applicable style before correcting them.[1][2] A strict traditional revision would use “Because of snow,” while a modern house style may retain due to.
Register can influence preference without creating a correctness scale. One frozen source describes due to as more formal and common in written or academic contexts, while describing because of as versatile across formal and informal contexts.[5] That is a usage tendency, not proof that every due to sentence is formal or that because of is casual.
The following original pairs model two sentence positions without turning the comma into a test for choosing the causal phrase:
- Because of the delay, we missed the opening.
- We missed the opening because of the delay.
- Due to the delay, we missed the opening.
- The cancellation was due to the delay.
In this teaching set, the opening material is separated and the final material remains integrated. The comma does not decide whether due to or because of expresses the intended cause.
Clarity can outweigh a mechanical replacement test. “The inspection was delayed due to rain” can attach due to rain to either the delay or the delaying action without changing the practical message. If the distinction matters, rewrite the sentence: “Rain caused the delay” or “The inspectors delayed the visit because of rain.”
This rewrite-first approach also prevents a house-style preference from being presented as a universal grammar correction.
When Should You Choose Between Due to and Because of?
First identify the requested style, then choose the clearest attachment. Use the caused-by test for a strict traditional edit. Use because of for an unambiguous reason attached to an action. In modern unrestricted prose, accept either phrase when both express the intended cause clearly.
Complete or revise each item according to its stated context.
- Follow the traditional rule: “The closure was _____ a power failure.”
- Follow the traditional rule: “The shop closed _____ a power failure.”
- Use ordinary modern prose with no house-style restriction: “The game was delayed _____ rain.” Accept supported alternatives.
- Revise concisely: “We canceled the walk due to the fact that the path was flooded.”
- Apply the caused-by test: “The error was _____ a missing bracket.”
- Add punctuation: “Because of the roadwork we took another route.”
- Decide whether a universal correction is justified: “Due to roadwork, we took another route.”
- Rewrite to make the cause attach directly to the action: “The late arrival was due to traffic.”
- Choose a natural conversational form: “I stayed home _____ the storm.”
- Explain why “The cancellation was caused by fog” helps test one phrase but not the other.
Answer key
- due to — Caused by can replace it: “The closure was caused by a power failure.”[1]
- because of — The phrase supplies the reason for the action closed under the traditional rule.[1]
- due to or because of — Modern usage permits overlap; the sentence does not impose a traditional house style.[1][2]
- We canceled the walk because the path was flooded. The revision removes the wordy phrase.[4]
- due to — The stated test produces “The error was caused by a missing bracket.”[2]
- Because of the roadwork, we took another route. The introductory phrase is followed by a comma.
- No. A strict traditional editor may prefer “Because of roadwork,” but the supplied evidence recognizes flexible modern due to usage.[1]
- We arrived late because of traffic. The revision makes the causal phrase modify the action directly.
- because of is the broadly versatile choice. Due to may also occur if the speaker’s variety and context permit it; the prompt asks for a natural default, not the only grammatical form.[5]
- Due to passes the traditional caused-by substitution: “The cancellation was due to fog.” Because of instead fits “The flight was canceled because of fog.”[1]