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At a Glance

Celestial Size Comparison

Choose the celestial objects you’re curious about. See at a glance how their sizes and environments compare.

Uranus50,724 km

Neptune49,244 km

Measurement	Uranus	Neptune
Mean radius	≈ 25,362 km	≈ 24,622 km
Diameter	≈ 50,724 km	≈ 49,244 km
Spherical approximate volume	≈ 6.833E13 km3	≈ 6.253E13 km3
Mass	≈ 8.681E25 kg	≈ 1.024E26 kg
Mean density	≈ 1,271 kg/m³	≈ 1,638 kg/m³
Surface gravity	≈ 8.69 m/s²	≈ 11.15 m/s²
Escape velocity	≈ 21.3 km/s	≈ 23.5 km/s
Rotation period	≈ -17.24 h	≈ 16.11 h
Orbital period	≈ 30,688.5 d	≈ 60,182 d
Mean temperature	≈ 76 K (-197.1°C)	≈ 72 K (-201.1°C)
Surface pressure	≈ 100,000 Pa	≈ 100,000 Pa
Orbital semi-major axis	≈ 2,870,658,170.7 km	≈ 4,498,396,417 km

Mean radius

Uranus: ≈ 25,362 km
Neptune: ≈ 24,622 km

Diameter

Uranus: ≈ 50,724 km
Neptune: ≈ 49,244 km

Spherical approximate volume

Uranus: ≈ 6.833E13 km3
Neptune: ≈ 6.253E13 km3

Mass

Uranus: ≈ 8.681E25 kg
Neptune: ≈ 1.024E26 kg

Mean density

Uranus: ≈ 1,271 kg/m³
Neptune: ≈ 1,638 kg/m³

Surface gravity

Uranus: ≈ 8.69 m/s²
Neptune: ≈ 11.15 m/s²

Escape velocity

Uranus: ≈ 21.3 km/s
Neptune: ≈ 23.5 km/s

Rotation period

Uranus: ≈ -17.24 h
Neptune: ≈ 16.11 h

Orbital period

Uranus: ≈ 30,688.5 d
Neptune: ≈ 60,182 d

Mean temperature

Uranus: ≈ 76 K (-197.1°C)
Neptune: ≈ 72 K (-201.1°C)

Surface pressure

Uranus: ≈ 100,000 Pa
Neptune: ≈ 100,000 Pa

Orbital semi-major axis

Uranus: ≈ 2,870,658,170.7 km
Neptune: ≈ 4,498,396,417 km

Please Note

This comparison is based on the most reliable observational data available. Celestial information may change with new research and observations, so please treat it as a general guide rather than a definitive source.