How large is Earth's radius?

Compare anything from 0.001 km to Neptune's orbit.

Earth radius6,371 km

Earth's mean radius from its centre to the surface.

The references just below and above

Nearby references are selected by logarithmic distance, not linear spacing.

How long would this journey take?

Calculated as uninterrupted travel at representative average cruising speeds.

Real travel time varies with route, stops, weather and operating conditions.

Objects move along logarithmic spacing, while size is compressed from the real ratio to remain legible.

Artwork and diagram notes

Object, landmark and planet artwork is original AI-generated imagery made for ScaleTrip. Maps use public-domain Natural Earth boundaries. Illustrations stay recognizable through logarithmic visual compression; they are not literal scale drawings.

Natural Earth — public domain

Direct answer

How large is Earth's radius?

ScaleTrip uses 6,371 kilometres as a rounded mean Earth radius. A radius runs from Earth's centre to its surface; it is not the same as diameter or circumference.

km6,371

m6,371,000

mi3,958.7559

Closest ScaleTrip references

Earth radius6,371 km · 1×
Earth's mean radius from its centre to the surface.
Seoul–London8,850 km · 0.72×
A long-distance route following Earth's curved surface.
Earth diameter12,742 km · 0.5×
The distance through Earth's centre from one side to the other.

Travel time at constant speed

Mode	Representative speed	Calculated time
Walking	5 km/h	53 days
Car	100 km/h	2.7 days
High-speed train	300 km/h	21 hr
Airliner	900 km/h	7.1 hr
Spacecraft	28,000 km/h	14 min

Real travel time varies with route, stops, weather and operating conditions.