Planetary · Solar system
Earth
12,742 kmOur ocean world, measured by mean diameter — the anchor for familiar planetary comparisons.
Planetary ↔ Planetary
How large is Mars compared with Earth?
Compare the mean diameters of two rocky planets that are often drawn at misleading relative sizes.
Linear ratio1.88×
Using the stated linear measurements, Earth is 1.88× Mars.
Planetary · Solar system
Mars
6,779 kmA cold desert world with giant volcanoes, canyons and evidence of ancient water.
The answer
A ratio, an analogy and the definitions behind both.
Using the stated linear measurements, Earth is 1.88× Mars.
About 1.88× Mars linear spans fit across the selected measurement of Earth.
mean diameter versus mean diameter
Both entries use compatible measurement definitions, making the ratio especially direct.
Earth is measured; mars is measured.
Representative, variable and model-dependent values are useful for perspective only when their status remains visible.
Measurement ledger
What exactly was divided?
| Landmark | Value | Measurement | Certainty | Source |
|---|---|---|---|---|
| Earth | 12,742 km | mean diameter | Measured | NASA Science ↗ |
| Mars | 6,779 km | mean diameter | Measured | NASA Science ↗ |