Scale Explorer

Space

How big is Uranus?

Uranus

Equatorial diameter
51,118 km 31,763 mi
Polar radius
24,973 km 15,518 mi
Mass
8.6811 × 10²⁵ kg 1.9139 × 10²⁶ lb
Volume
6.833 × 10¹³ km³ 1.639 × 10¹³ cu mi
Show
Human, Mars, Earth, Uranus drawn to the same scaleHuman: height 1.61–1.75 m (too small to see at this scale). Mars: equatorial diameter 6,792 km. Earth: equatorial diameter 12,756 km. Uranus: equatorial diameter 51,118 km.Human: 1.61–1.75 m (too small to see at this scale)Mars: 6,792 kmEarth: 12,756 kmUranus: 51,118 kmUranus51,118 kmEarth12,756 kmMars6,792 kmHuman1.61–1.75 m · too small to see

Human is too small to see at this scale and is marked with ▲.

Everything is drawn to the same scale, standing on the same ground line. Silhouettes are simplified outlines scaled to the measured dimension. A faded outline shows the top of a size range.

Compare Uranus with something else →

Zoom out from an average adult to Uranus

Uranus is too big to show next to an average adult in one picture, so here it is in 8 steps. Each step is drawn to its own scale and zooms out from the step before.

  1. Step 1 of 8 Human → Megalodon

    A megalodon is about 8.6–15 times as long as an average adult is tall.

    Human, Megalodon drawn to the same scaleHuman: height 1.61–1.75 m. Megalodon: maximum length (estimates) 15–24.3 m.Human: 1.61–1.75 mMegalodon: 15–24.3 mMegalodon15–24.3 mHuman1.61–1.75 m
    Step 1: Human and Megalodon at the same scale.

  2. Step 2 of 8 Megalodon → Great Pyramid of Giza

    The Great Pyramid of Giza is about 5.6–9.1 times as tall as a megalodon is long.

    Megalodon, Great Pyramid of Giza drawn to the same scaleMegalodon: maximum length (estimates) 15–24.3 m. Great Pyramid of Giza: current height ≈ 137 m.Megalodon: 15–24.3 mGreat Pyramid of Giza: ≈ 137 mGreat Pyramid of Giza≈ 137 mMegalodon15–24.3 m
    Step 2: Megalodon and Great Pyramid of Giza at the same scale.

  3. Step 3 of 8 Great Pyramid of Giza → Golden Gate Bridge

    The Golden Gate Bridge is about 20 times as long as the Great Pyramid of Giza is tall.

    Great Pyramid of Giza, Golden Gate Bridge drawn to the same scaleGreat Pyramid of Giza: current height ≈ 137 m. Golden Gate Bridge: total length 2,737 m.Great Pyramid of Giza: ≈ 137 mGolden Gate Bridge: 2,737 mGolden Gate Bridge2,737 mGreat Pyramid of Giza≈ 137 m
    Step 3: Great Pyramid of Giza and Golden Gate Bridge at the same scale.

  4. Step 4 of 8 Golden Gate Bridge → Mount Everest

    Mount Everest is about 3.2 times as tall as the Golden Gate Bridge is long.

    Golden Gate Bridge, Mount Everest drawn to the same scaleGolden Gate Bridge: total length 2,737 m. Mount Everest: height above sea level 8,848.86 m.Golden Gate Bridge: 2,737 mMount Everest: 8,848.86 mMount Everest8,848.86 mGolden Gate Bridge2,737 m
    Step 4: Golden Gate Bridge and Mount Everest at the same scale.

  5. Step 5 of 8 Mount Everest → Mauna Kea

    Mauna Kea is about 1.2 times as tall as Mount Everest.

    Mount Everest, Mauna Kea drawn to the same scaleMount Everest: height above sea level 8,848.86 m. Mauna Kea: height from ocean floor to summit ≈ 10,211 m.Mount Everest: 8,848.86 mMauna Kea: ≈ 10,211 mMauna Kea≈ 10,211 mMount Everest8,848.86 m
    Step 5: Mount Everest and Mauna Kea at the same scale.

  6. Step 6 of 8 Mauna Kea → Olympus Mons

    Olympus Mons is about 2.2–2.6 times as high as Mauna Kea is tall.

    Mauna Kea, Olympus Mons drawn to the same scaleMauna Kea: height from ocean floor to summit ≈ 10,211 m. Olympus Mons: height 22–27 km.Mauna Kea: ≈ 10,211 mOlympus Mons: 22–27 kmOlympus Mons22–27 kmMauna Kea≈ 10,211 m
    Step 6: Mauna Kea and Olympus Mons at the same scale.

  7. Step 7 of 8 Olympus Mons → Mars

    Mars is about 250–310 times as wide as Olympus Mons is high.

    Olympus Mons, Mars drawn to the same scaleOlympus Mons: height 22–27 km. Mars: equatorial diameter 6,792 km.Olympus Mons: 22–27 kmMars: 6,792 kmMars6,792 kmOlympus Mons22–27 km
    Step 7: Olympus Mons and Mars at the same scale.

  8. Step 8 of 8 Mars → Uranus

    Uranus is about 7.5 times as wide as Mars.

    Mars, Uranus drawn to the same scaleMars: equatorial diameter 6,792 km. Uranus: equatorial diameter 51,118 km.Mars: 6,792 kmUranus: 51,118 kmUranus51,118 kmMars6,792 km
    Step 8: Mars and Uranus at the same scale.

Dimensions

MeasurementMetricImperialNotesSource
Equatorial diameter 51,118 km 31,763 mi Diameter at the equator, at the 1-bar pressure level [1] [3]
Polar radius 24,973 km 15,518 mi Centre to pole at the 1-bar level (equatorial radius is 25,559 km) [2]
Mass 8.6811 × 10²⁵ kg 1.9139 × 10²⁶ lb Total mass; source states 86.811 x 10^24 kg [2]
Volume 6.833 × 10¹³ km³ 1.639 × 10¹³ cu mi Source states 6,833 x 10^10 km3 [2]

About Uranus

Uranus is the seventh planet from the Sun and an ice giant. It has an equatorial diameter of 51,118 km, about four times Earth's width. Its spin axis is tipped over by about 98 degrees, so it travels around the Sun almost on its side.

  • NASA gives Uranus an equatorial diameter of 51,118 km (31,763 miles), four times wider than Earth. [3]
  • If Earth were the size of a nickel, Uranus would be about as big as a softball. [3]
  • Uranus's obliquity to its orbit is 97.77 degrees, and one day there lasts about 17.24 hours. [2]
  • Uranus has 28 known moons and a ring system. [2]

How many fit?

  • ≈ 30 million × Human · height lined up end to end match the Uranus · equatorial diameter
  • ≈ 1 × 10²⁴ × Human · body mass on the scales weigh as much as Uranus · mass
  • ≈ 15 × Moon · diameter lined up end to end match the Uranus · equatorial diameter
  • ≈ 1,200 × Moon · mass on the scales weigh as much as Uranus · mass
  • ≈ 3,100 × Moon · volume packed inside, by volume fill Uranus · volume

Counts divide one sourced figure by another. "End to end" uses each object's main measurement; weight and volume rows appear only when both figures are sourced.

How it compares

Factors compare the equatorial diameter of Uranus with each object’s own main measurement (height for a human). Where a size varies, the factor is given as a range.

Notes on these figures

  • Radii are measured at the 1-bar pressure level, since Uranus has no solid surface.

Sources

  1. NASA Space Science Data Coordinated Archive, Planetary Fact Sheet - Metric. Accessed 25 September 2026.
  2. NASA Space Science Data Coordinated Archive, Uranus Fact Sheet. Accessed 25 September 2026.
  3. NASA Science, Uranus: Facts. Accessed 25 September 2026.

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