* Uranus:
* Diameter: 51,118 km (31,763 miles)
* Mass: 8.68 × 1025 kg (1.91 × 1026 lb)
* Mercury:
* Diameter: 4,880 km (3,032 miles)
* Mass: 3.30 × 1023 kg (7.27 × 1023 lb)
Uranus is about 4 times wider than Mercury and about 26 times more massive.
Here's a visual representation:
Imagine a basketball (Uranus) and a golf ball (Mercury). That's about the size difference between the two planets.