1 Earth radius
6,371 kmLength · definition
The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.
Length & distance
Just how long is 1 Earth radius?
Our planet
1 R⊕
1 Earth radius
The quantity is exact as entered.
6,371 kmLength
0 - shared origin
Mars
Mars is a rocky planet orbiting the Sun, with a reddish surface due to iron oxide.
6,779 kmMean diameter
0 - shared origin
Both rulers start at the same zero and share one linear scale. Artwork keeps its original proportions. A ruler represents the selected distance or a measurement not visible in this view.
A little perspective
The mean diameter of Mars is about 1.06 times 1 Earth radius.
Measurements, assumptions & sources +
1 Earth radius
Length: 6,371 km; definition.
The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.
Mars
Mean diameter: 6,779 km; approximate.
Mean-radius spherical model for Mars; actual shape is not perfectly spherical.
NASA JPL — planetary physical parameters
The marked mean diameter is calibrated. Unmeasured illustration details are representative.
Measurement details
Why these numbers?
Compare 1 Earth radius with the mean diameter of Mars. The notes below explain how each value was chosen.
Mars
6,779 kmMean diameter · approximate
Mean-radius spherical model for Mars; actual shape is not perfectly spherical.
- Comparing
- Length ↔ Mean diameter
- Relative size
- The mean diameter of Mars is about 1.06 times 1 Earth radius. The mean diameter of Mars is approximately 6.4% greater than 1 Earth radius.
How to read the visual
The diagram uses the recorded measurements. Details outside the marked spans do not set the scale.
- The mean diameter of Mars: This is an estimate; check the notes for its rounding and uncertainty.
This comparison follows the selected length only; other dimensions may differ.
6,371,000 mmetres
20,902,000 ftfeet
3,958.8 mimiles
4.2588 × 10⁻⁵ AUastronomical units
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