Neptune is larger than Earth in volume, diameter, and mass.
Neptune versus Earth Diameter
With an equatorial circumference of 96,129 miles, Neptune is 3.8647 times larger than the Earth. [“Neptune Fact Sheet.” NASA]
Neptune versus Earth Volume
With a volume of 15,000,714,125,712 mi3 , Neptune is 57.723 times larger than the Earth. [“Neptune Fact Sheet.” NASA]
Neptune versus Earth Mass
With a mass of 1.0241 x 1026 kg, Neptune is 17.148 times larger than Earth. This is interesting because Neptune is a gas planet, but it still weighs more. [“Neptune Fact Sheet.” NASA]
Can You See Giant Neptune?
Neptune is not visible to the naked eye. When viewed through a telescope, Neptune appears bluish green due to its composition of methane. The fact that it has a vivid blue tint suggests that it may be composed of an unknown component. [“Solar System Exploration: Solar System 101.” NASA]
How Does Neptune’s Size Affect Orbit?
The planet’s orbit is just as large as its size. It takes 164.791 Earth years for a single year to pass on Neptune. However, due to its faster rotation, at 16.11 hours, Neptune has fewer hours in a day than Earth. [“Neptune Fact Sheet.” NASA]
Does This Size Affect Surface Gravity?
While Neptune is substantially larger than Earth, its surface gravity of 36.6 ft/s² is relatively the same as Earth. According to NASA if you weigh 100 pounds on Earth you would weigh 114 pounds on Neptune.