Robert Downey Jr. is generally reported to be about 5 ft 8 in tall, which is roughly 173–174 cm.

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Here’s the short version tailored to what you asked:

  • Most biographical and entertainment sources list his height as 5'8" (about 173–174 cm).
  • Some fan and comparison sites argue he might be slightly shorter (around 5'7"), but 5'8" remains the commonly cited figure.
  • On screen, he can look taller thanks to shoe lifts, camera angles, and staging, especially next to taller Marvel co‑stars like Chris Evans and Chris Hemsworth.

So, if you’re just looking for a clear number to remember: Robert Downey Jr. is about 5'8" (≈174 cm).

Information gathered from public forums or data available on the internet and portrayed here.