Key limes are small, typically measuring between 1 ½ to 2 inches in diameter. According to the University of Florida IFAS Extension, these fruits are round to oval-shaped.
Here's a summary of their size characteristics:
- Diameter: 1 ½ to 2 inches (38–51 mm)
- Shape: Round to oval
Key limes are also known for having a thin, smooth peel that turns greenish-yellow to yellow as they mature. The pulp inside is greenish-yellow, very juicy, and quite acidic, with a distinctive aroma. They usually contain 10-12 segments around a small axis.