- Lap harps: These are the smallest harps, typically ranging in size from 22 to 36 strings. They are designed to be played while sitting down, with the harp resting on the player's lap.
- Small harps: These harps are larger than lap harps, but still relatively portable. They typically have 36 to 40 strings and are often used by children or as travel harps.
- Medium harps: These harps are larger still, with 40 to 47 strings. They are often used by intermediate and advanced harpists.
- Large harps: These harps are the largest and most powerful of all. They typically have 47 to 52 strings and are used by professional harpists.