What's the proportion of Mars' surface compared to Earth's surface uncovered of water? How does Mars surface compare to Earth's surface? Mars is quite smaller than Earth, but most Earth's surface is covered with water. I thought making the math could be relatively easy but Earth isnt a sphere and I dont know about Mars? 

What's the proportion of Mars' surface compared to Earth's surface uncovered of water?
The surface area of Mars is 144798500 km2

The land area of Earth is 148940000 km2 (figures from wikipedia)

Thus, the land area of Earth is slightly (about 3%) larger than the land area of Mars. However much of the Earth's surface is suitable for human habitation, but none of Mars is suitable for humans.