“In length” is common for measurements. “Of length” is rare in modern English and usually appears only inside technical or formal structures.
Use “in length” to describe measurement, especially after numbers. “Of length” is uncommon in everyday English and usually replaced by “in length” or “long.”
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
Use this pattern after dimensions or measurements.
Use this verb pattern to describe differences.
This structure is uncommon and usually appears after another noun in specialist contexts.
The same subject can take different constructions because each sentence answers a different question.
Some combinations appear in real text but do not mean what learners often assume.
Everyday English usually prefers “in length.”
✕ The river is 300 kilometres of length. ✓ The river is 300 kilometres in length.“In length” usually follows a specific dimension.
✕ The table is in length. ✓ The table is two metres in length.Choose the expression that matches the intended meaning.
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It is neutral and common in both formal and everyday English.
Usually no. It sounds technical or unnatural outside specialist contexts.
You can often use “long,” such as “The bridge is 200 metres long.”
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