The density of Uranus is 1.27 grams/cubic centimeter.
Need a point of comparison? Well, Uranus actually is the second least dense planet in the Solar System after Saturn. The density of Saturn is 0.687 g/cm3. Earth is the densest planet in the Solar System, measuring 5.51 g/cm3.
Want to calculate the density of Uranus all by yourself? No problem. Go grab a calculator and then divide the mass of Uranus (8.68 x 1025 kg) by the volume (6.83 x 1013 km3. If you did the math right, you should come out with the same value for the density of Uranus: 1.27 g/cm3.
If you’re looking for more information on the density of planets. Here’s an article about the density of Saturn, and here’s the density of Jupiter.
We have recorded an episode of Astronomy Cast just about Uranus. You can access it here: Episode 62: Uranus.