How big is Venus compared to Mercury?
2.5×wider than Mercury
Venus is 2.5× wider than Mercury — 12,104 km across against Mercury’s 4,879 km. By volume, about 15 Mercuries would fit inside Venus. Venus has 14.8× Mercury’s mass.
▶ See Venus and Mercury in 3D
Side by side
Diameter
Venus 12,104 km · Mercury 4,879 km
Width ratio
Venus is 2.5× wider
Volume
15 Mercuries fit inside Venus
Mass
Venus is 14.8× Mercury
Gravity (Venus · Mercury)
8.9 m/s² · 3.7 m/s²
Distance from Sun
0.72 AU · 0.39 AU
Mercury sits closer to the Sun, but Venus is the hotter world — its thick carbon-dioxide blanket is worth more than the extra sunlight.
What sets them apart
Both orbit closer to the Sun than Earth, yet they could hardly differ more. Venus is about two and a half times wider than Mercury and roughly fifteen times its mass, wrapped in a crushing acid atmosphere; Mercury is a bare, airless rock.
Ratios are easy to nod along to and impossible to picture. In the interactive view, switch to True scale to see Venus and Mercury 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 Found something out of date?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.