Space · Mean-diameter reference · idealized sphere
Earth diameter and size comparison
Earth uses a mean diameter of 12,742.0168 kilometers. Its equatorial and polar dimensions differ, so a single circular globe is a reference model rather than a claim that Earth is perfectly round.
12742016.8 m
Sourced measurement- Measurement
- Mean diameter · twice JPL mean radius
- Subject or version
- Mean-diameter reference · idealized sphere
- In kilometers
- 12,742.0168 km (1 km = 1,000 m)
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A little more perspective
JPL separately lists an equatorial radius of 6,378.1366 kilometers. This scene uses its mean-radius field consistently with the other planets. The fine digits preserve that reference value; the illustration cannot resolve small departures from the reference sphere.
The displayed diameter is 2 × 6,371.0084 km = 12,742.0168 km. Doubling the source radius uncertainty gives ±0.0002 km for diameter. The source defines mean radius through an equivalent-volume sphere. Its review date is not a new measurement date.
Quick facts
Earth uses a mean diameter of 12,742.0168 kilometers. Its equatorial and polar dimensions differ, so a single circular globe is a reference model rather than a claim that Earth is perfectly round.
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Sources and measurement notes
Source review recorded . Maintained by Ishan Karunaratne. Suggest a correction with a source and the exact measurement being compared.