how big is mars compared to earth
Mars is much smaller than Earth: it’s a bit over half Earth’s diameter, with only about a quarter to a third of Earth’s surface area and roughly a tenth of its mass.
Quick Scoop
- Mars’ diameter is about 6,790–6,800 km; Earth’s is about 12,700–12,800 km, so Mars is roughly 53% as wide as Earth.
- Mars has about 15% of Earth’s volume and about 10–11% of Earth’s mass.
- Mars’ total surface area is roughly 28–38% of Earth’s, similar to the area of all Earth’s dry land put together.
- Gravity on Mars is only about 37–38% of Earth’s, so you’d weigh a bit more than one‑third of your Earth weight there.
Size and gravity at a glance
| Property | Earth | Mars | Mars vs Earth |
|---|---|---|---|
| Diameter | ≈ 12,742 km | [5]≈ 6,792 km | [1][5]≈ 53% of Earth | [8][5]
| Radius (equatorial) | ≈ 6,378 km | [3][8]≈ 3,396 km | [3][8]≈ 53% of Earth | [8][3]
| Surface area | ≈ 510 million km² | [5]≈ 145 million km² | [1][5]≈ 28–38% of Earth, similar to Earth’s land area | [7][1][5]
| Volume | ≈ 1.08 × 10¹² km³ | [5][8]≈ 1.63 × 10¹¹ km³ | [8][5]≈ 15% of Earth | [7][5][8]
| Mass | ≈ 5.97 × 10²⁴ kg | [5][8]≈ 6.4 × 10²³ kg | [8][5]≈ 10–11% of Earth | [7][5][8]
| Surface gravity | 1 g (9.8 m/s²) | [3][8]≈ 0.37–0.38 g | [1][3][7][8]≈ 37–38% of Earth | [1][3][7][8]
A quick way to picture it
If Earth were the size of a basketball , Mars would be more like a small soccer ball or a large orange sitting next to it. You’d also feel dramatically lighter on that smaller world, bouncing around at just over one‑third of your Earth weight.
TL;DR: Mars is just over half as wide as Earth, has land area similar to all Earth’s continents combined, and its gravity is only about 38% of Earth’s.
Information gathered from public forums or data available on the internet and portrayed here.