African Violets can be divided in four main categories depending upon their size:
- Large plants, Standard plants, Semi-Miniature plants, Miniature plants.
- The diameters of these African violet plants are measured across a single crown.
- They are each defined as below:
Large African Violet plants:
- Large African violet plants when fully mature range from 16 inches (40cm) or larger in diameter across a single crown.
- The flowers on these plants can grow to 3 inches (7.5cm) across the petals and a single leaf blade can grow to 6 inches (15cm) in length.

Standard African Violet plants:
- Standard African violet plants when fully mature range from 8-16 inches (20-40cm) in diameter across a single crown.
- The flowers on these plants can grow to 2 inches (5cm) across the petals and a single leaf blade can grow to 3 inches (7.5cm) in length.

Semi-Miniature African Violet plants:
- Semi-Miniature African violet plants when fully mature range from 6-8 inches (15-20cm) in diameter across a single crown.
- The flowers on these plants can grow to 1.5 inches (3.8cm) across the petals and a single leaf blade can grow to 2 inches (5cm) in length.

Miniature African Violet plants:
- Miniature African violet plants when fully mature grow up to from 6 inches (15cm) in diameter across a single crown.
- The flowers on these plants can grow to 0.75 inches (2cm) across the petals and a single leaf blade can grow to 1 inches (2.5cm) in length.
- There are also certain varieties being described as micro-minis, who have a diameter of 3 inches (7.5cm) or less. The flowers and leaves of these micro-mini African violet plants are also much smaller in size.