Instagram allows 150 characters in a bio.
The limit applies to the short profile description beneath a username. It includes letters, spaces, punctuation, emojis, and other characters, so a bio can fill up faster than its word count suggests. Users commonly use the space for a name, role, interests, short slogan, or link prompt.
The bio limit is separate from Instagram’s other text limits. Captions, comments, usernames, and direct messages have different rules, and Instagram has changed several limits and interface details over time. That is why figures such as 100, 200, or 250 may appear in older guides or in discussions about other profile fields.
A neighbouring fact is that Instagram profiles can also include clickable profile links and category information, but those elements do not expand the bio’s character allowance. The count is about the text entered in the bio field itself.