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Sure, Uranus is big… but how big is it? There are so many ways we can measure the size of Uranus, so let’s look at all of them.
First, let’s take a look at diameter. The diameter of Uranus is 51,118 km across. For comparison, this is about 4 times bigger than Earth.
Now, let’s look at volume. The total volume of Uranus is 6.833×1013 km3. Again, for comparison, you could fit 63 Earths inside Uranus, and still have room to spare.
Next, mass. The mass of Uranus is 8.68×1025 kg. This is about 14.5 times more massive than Earth. This sounds like a lot, but this makes Uranus the smallest of the outer planets, smaller even than Neptune.
How about surface area? The surface area of Uranus is 8.1×109 km2. This would let you flatten out almost 16 Earths to cover the surface area of Uranus.
We have recorded an episode of Astronomy Cast just about Uranus. You can access it here: Episode 62: Uranus.