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⊕
6,371,000 mmetres
20,902,000 ftfeet
3,958.8 mimiles
4.2588 × 10⁻⁵ AUastronomical units
01
1 Earth radius6,371 kmLength · definition
02
Mars6,779 kmMean diameter · approximate
Both marked spans share one linear scale. Artwork keeps its proportions; poses and surface detail are illustrative.
A little perspective
The mean diameter of Mars is about 1.06 times the length of 1 Earth radius.
Measurements, assumptions & sources +
1 Earth radius
The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.
Mars
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?
The visual compares length with mean diameter. The records below preserve each value’s basis and caveats.
Mars
6,779 kmMean diameter · approximate
Mean-radius spherical model for Mars; actual shape is not perfectly spherical.
- Comparing
- Length ↔ Mean diameter
- Relative size
- Mars is larger on this measurement by a factor of about 1.06. Mars's selected measurement is approximately 6.4% greater than 1 Earth radius's.
How to read the visual
The labelled spans and stored measurements determine the scale; unmeasured illustration details do not.
- Mars is labelled approximate; treat the displayed value as a comparison anchor rather than false precision.
Change your perspective
Put it next to…
Choose a suggestion to redraw the comparison, or open its page to learn what it is.
A little smaller. A little larger.