Uranus is the third most massive planet in our solar system. Here's a breakdown:

* 1st: Jupiter (317.8 Earth masses)

* 2nd: Saturn (95.1 Earth masses)

* 3rd: Uranus (14.5 Earth masses)

* 4th: Neptune (17.1 Earth masses)

While Neptune is slightly more massive than Uranus, it's important to note that Uranus is the largest planet in terms of diameter.