How big is Neptune compared to Venus?
Data as of July 2026
4.1×wider than Venus
Neptune is 4.1× wider than Venus: 49,244 km across against Venus’s 12,104 km. By volume, about 67 Venuses would fit inside Neptune. Neptune has 21.0× Venus’s mass.
▶ See Neptune and Venus in 3D
Side by side
Diameter
Neptune 49,244 km · Venus 12,104 km
Width ratio
Neptune is 4.1× wider
Volume
67 Venuses fit inside Neptune
Mass
Neptune is 21.0× Venus
Gravity (Neptune · Venus)
11.2 m/s² · 8.9 m/s²
Distance from Sun
30.1 AU · 0.72 AU
Sunlight reaches Venus in about 6 minutes. It takes about 4 hours to reach Neptune.
What sets them apart
Neptune is about four times wider than Venus and around 21 times its mass. Venus comes closer to Earth than any other planet, about 38 million km at its nearest; Neptune, the outermost planet, never gets closer than about 4.3 billion km.
Ratios are easy to nod along to and impossible to picture. In the interactive view, switch to True scale to see Neptune and Venus at their honest relative sizes.
Keep going
✓ Facts verified July 2026
Every figure on this page is a real, rounded value checked against primary sources. Found something out of date? See how we keep it accurate.