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In general industry, how tall must the letters on an Exit sign be?

At least 6 inches high.

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  1. At least 3 inches
  2. At least 12 inches
  3. At least 6 inches ✔

Why: OSHA requires the word Exit in plainly legible letters at least 6 inches high, with main strokes at least three-fourths of an inch wide.

Huh, didn't know that: A door that could be mistaken for an exit must be marked Not an Exit or show its real use.

The dad joke
Why do exit signs never get lost? They always know the way out.
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References

Answer: At least 6 inches. OSHA requires the word Exit in plainly legible letters at least 6 inches high, with main strokes at least three-fourths of an inch wide.

  1. 29 CFR 1910.37 Maintenance, safeguards, and operational features for exit routes www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1910/subpart-E/section-1910.37
    not less than six inches (15.2 cm) high
    Checked 2026-10-10.

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